ANSI/AWWA C509-15
(Revi si on of AN SI /AW WA C5 0 9 - 0 9)
®
AWWA Standard
Resilient-Seated
Gate Valves for Water
Supply Service
Efecti ve date: Feb. 1 , 201 6.
First edition approved by AWWA Board o f Directors Jan. 28, 1 980.
This edition approved J une 7, 201 5.
Approved by American N ational Standards Institute Oct. 30, 201 5.
SM
Copyright © 201 6 American Water Works Association. All Rights Reserved.
AWWA Standard
This document is an American Water Works Association (AWWA) standard. It is not a speci f cation. AWWA standards
describe minimum requirements and do not contain all o f the engineering and administrative in formation normally
contained in speci f cations. The AWWA standards usually contain options that must be evaluated by the user o f the
standard. Until each optional feature is speci f ed by the user, the product or service is not fully de f ned. AWWA pub
lication o f a standard does not constitute endorsement o f any product or product type, nor does AWWA test, certi fy,
or approve any product. The use o f AWWA standards is entirely voluntary. This standard does not supersede or take
precedence over or displace any applicable law, regulation, or code o f any governmental authority. AWWA standards
are intended to represent a consensus o f the water supply industry that the product described will provide satis factory
service. When AWWA revises or withdraws this standard, an o f cial notice o f action will be placed on the f rst page o f
the O f cial Notice section o f Journal – American Water Works Association . The action becomes efective on the f rst
day o f the month following the month o f Journal – American Water Works Association publication o f the o f cial notice.
-
American National Standard
An American National Standard implies a consensus o f those substantially concerned with its scope and provisions.
An American National Standard is intended as a guide to aid the manu facturer, the consumer, and the general public.
The existence o f an American National Standard does not in any respect preclude anyone, whether that person has ap
proved the standard or not, from manu facturing, marketing, purchasing, or using products, processes, or procedures
not con forming to the standard. American National Standards are subject to periodic review, and users are cautioned
to obtain the latest editions. Producers o f goods made in con formity with an American National Standard are encour
aged to state on their own responsibility in advertising and promotional materials or on tags or labels that the goods
are produced in con formity with particular American National Standards.
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C au tion n otiCe : The American National Standards Institute (ANSI) approval date on the front cover o f this standard
indicates completion o f the ANSI approval process. This American National Standard may be revised or withdrawn at
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years from the date o f publication. Purchasers o f American National Standards may receive current in formation on
all standards by calling or writing the American National Standards Institute, 25 West 43rd Street, Fourth Floor, New
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Revenue from the sales of this AWWA material supports
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either electronic or photocopied, is illegal and hinders
AWWA’s mission to support the water community.
ISBN-1 3, print:
978-1 -62576-1 36-1
eISBN-1 3, electronic: 978-1 -61 300-362-6
DOI: http://dx.doi.org/1 0.1 2999/AWWA.C509.1 5
All rights reserved. No part o f this publication may be reproduced or transmitted in any form or by any means,
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brie f excerpts or quotations for review purposes, without the written permission o f the publisher.
Copyright © 201 5 by American Water Works Association
Printed in USA
ii
Copyright © 201 6 American Water Works Association. All Rights Reserved.
Committee Personnel
Te C509 Subcommittee, which developed this standard, had the following personnel at that time:
T. Chad Harbour, Chair
L.R. Dunn, U.S. Pipe & Foundry Company, Birmingham, Ala.
(AWWA)
L.W. Fleury Jr., Mueller Group, Smithfeld, R.I.
(AWWA)
T.C . Harbour, Clow Valve Company, Oskaloosa, Iowa
(AWWA)
T.R. Ingalls,* EJ, USA Inc., East Jordan, Mich.
(AWWA)
R.L. Larkin, J and S Valve, Birmingham, Ala.
(AWWA)
R. Looney, American AVK Company, Minden, Nev.
(AWWA)
N.O. Mejia, L.A. Department of Water and Power, Los Angeles, Calif.
(AWWA)
T.J. Mettler, Waterous Company, South St. Paul, Minn.
(AWWA)
K.J. Wright, EJ, USA Inc., East Jordan, Mich.
(AWWA)
Te AWWA Standards Committee on Gate Valves and Swing Check Valves, which reviewed and
approved this standard, had the following personnel at the time of approval:
Joseph J. Gemin, Chair
General Interest Members
J.M. Assouline, CH2M HILL, Englewood, Colo.
M.D. Bennett, MWH, Cleveland, Ohio
D. Diefenbach, Carollo, Phoenix, Ariz.
J.J. Gemin, AECOM, Kitchener, Ont., Canada
J. Hebensreit, Underwriters Laboratories Inc., Northbrook, Ill.
M.C. Johnson, Utah State University Water Research Laboratory, Logan, Utah
S.M. Passarelli,† Standards Engineer Liaison, AWWA, Denver, Colo.
T.R. Volz, AECOM, Denver, Colo.
M.P. Yoke, Anniston, Ala.
* Alternate
† Liaison, nonvoting
iii
Copyright © 201 6 American Water Works Association. All Rights Reserved.
(AWWA)
(AWWA)
(AWWA)
(AWWA)
(UL)
(AWWA)
(AWWA)
(AWWA)
(AWWA)
Producer Members
J.V. Ballun, Val-Matic Valve & Manufacturing Corporation, Elmhurst, Ill.
f
J. Bolender, J and S Valves, Hu man,
Texas
(AWWA)
D.E. Burczynski,* Kennedy Valve, Elmira, N.Y.
L.W. Fleury Jr., Mueller Group, Chattanooga,
(AWWA)
(AWWA)
Tenn.
(AWWA)
T.C. Harbour, Clow Valve Company, Oskaloosa, Iowa
T.R. Ingalls,* EJ, USA Inc., East Jordan, Mich.
(AWWA)
R.L. Larkin,* J and S Valve, Gardendale, Ala.
(AWWA)
R. Looney, American AVK Company, Minden, Nev.
(AWWA)
T.J. Mettler, Waterous Company, South St. Paul, Minn.
(AWWA)
D.B. Scott,* American Flow Control, Birmingham, Ala.
(AWWA)
J.H. Wilber,* American AVK, Littleton, Colo.
(AWWA)
K.J. Wright, EJ, USA Inc., East Jordan, Mich.
(AWWA)
(AWWA)
User Members
R.L. Gardner,† Standards Council Liaison, Wannacomet Water Company,
Nantucket, Mass.
(AWWA)
B. Hasanabadi, Colorado Springs Utilities, Colorado Springs, Colo.
(AWWA)
Tarrant Regional Water District, Fort Worth, Texas
K. S. Jeng-Bulloch, City of Houston, Houston, Texas
(AWWA)
M. MacConnell, Metro Vancouver, Burnaby, B.C., Canada
(AWWA)
J. S. Olson, Front Range Standard Committee, Littleton, Colo.
(AWWA)
A. Quiniones, US Bureau of Reclamation, Denver, Colo.
(AWWA)
D. Rausch, City of Aurora Water Department, Aurora, Colo.
(AWWA)
P.J. Ries, Denver Water Department, Denver, Colo.
(AWWA)
S. Hattan,
* Alternate
† Liaison, nonvoting
iv
Copyright © 201 6 American Water Works Association. All Rights Reserved.
(AWWA)
Contents
All AWWA standards follow the general format indicated subsequently. Some variations from this
format may be found in a particular standard.
SEC.
PAGE
SEC.
4.5 Fabrication ...................................... 22
Foreword
I Introduction .................................... vii
I.A Background..................................... vii
I.B History............................................ vii
I.C Acceptance ...................................... vii
II Special Issues .................................... ix
II.A Chlorine and Chloramine
Degradation of Elastomers ......... ix
III Use of Tis Standard ........................ ix
III.A Purchaser Options and
Alternatives ................................ ix
III.B Modifcation to Standard ................. xi
IV Major Revisions................................ xi
V Comments ....................................... xi
5
Veri fcation
6
Delivery
5.1 Testing ............................................ 22
5.2 Plant Inspection and Rejection ........ 24
6.1 Marking .......................................... 25
6.2 Preparation for Shipment................. 25
6.3 Afdavit of Compliance .................. 25
Appendixes
A
Gate Valves
A.1 General ........................................... 27
A.2 Unloading ....................................... 27
A.3 Receiving Inspection ....................... 27
A.4 Storage ............................................ 28
A.5 Installation ...................................... 28
A.6 Maintenance ................................... 31
A.7 Repairs ............................................ 32
General
1.1 Scope ................................................ 1
1.2 Purpose ............................................. 2
1.3 Application........................................ 2
2
References ........................................ 2
3
Def nitions ....................................... 5
Tables
1
2
4.1 Data to Be Supplied by the
Manufacturer .............................. 6 3
4.2 Materials ........................................... 7 4
4.3 General Design ............................... 10
4.4 Detailed Design .............................. 11
4
Installation, Operation, and
Maintenance of Resilient-Seated
Standard
1
PAGE
Requirements
Design Torque................................. 11
Minimum Full Waterway Sizes ....... 11
Minimum Tickness of Body
and Bonnet ............................... 12
Minimum Tickness
for Ductile-Iron Connecting
End Flanges .............................. 13
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
SEC.
5
6
7
8
PAGE
SEC.
PAGE
Excess Flange Tickness .................. 14 9 Outside Diameter of
Handwheels .............................. 20
Stem Gate, Trust Collar, and
Stem Nut Copper Alloys ........... 16 10 Gear Ratios ..................................... 21
Stainless-Steel Valve Stem Alloys ..... 17 11 Proof-of-Design Torque ................... 23
Minimum Diameter of Stem and
Minimum Number of Turns
to Open..................................... 18
vi
Copyright © 201 6 American Water Works Association. All Rights Reserved.
Foreword
Tis foreword is for information only and is not a part ofANSI*/AWWA C509.
I.
Introduction.
I.A. Background. Tis standard describes resilient-seated gate valves with
nonrising stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including
tapping gate valves for water supply service. Te resilient-seated gate valve has been in
service in various water utility applications since 1975.
I.B. History. Te frst edition of ANSI/AWWA C509, Resilient-Seated Gate
Valves, was published in 1980. ANSI/AWWA C509 includes body and bonnet parts
of either gray or ductile cast iron with shell-wall thicknesses equal to those of the
ANSI/AWWA C500, Metal-Seated Gate Valves, which was frst issued in 1952 as
ANSI/AWWA C500 but had its roots going back to the frst AWWA standard for
gate valves adopted June 24, 1913.
Te Manufacturers Standardization Society of the Valves and Fittings Industry
(MSS) has played an important role in developing this standard. Founded in 1924,
MSS has had ofcial organizational representation on AWWA standards committees
dealing with valve and hydrant products since 1930.
Te frst edition of ANSI/AWWA C509 was approved by the AWWA Board of
Directors on Jan. 28, 1980, with subsequent editions in 1987, 1994, 2001, and 2009.
Tis edition was approved on June 7, 2015.
I.C. Acceptance. In May 1985, the US Environmental Protection Agency
(USEPA) entered into a cooperative agreement with a consortium led by NSF
International† (NSF) to develop voluntary third-party consensus standards and a
certifcation program for direct and indirect drinking water additives. Other members of
the original consortium included the Water Research Foundation‡ (formerly AwwaRF)
and the Conference of State Health and Environmental Managers (COSHEM). Te
American Water Works Association (AWWA) and the Association of State Drinking
Water Administrators (ASDWA) joined later.
In the United States, authority to regulate products for use in, or in contact with,
drinking water rests with individual states.§ Local agencies may choose to impose
* American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036.
† NSF International, 789 North Dixboro Road, Ann Arbor, MI 48105.
‡ Water Research Foundation, 6666 West Quincy Avenue, Denver, CO 80235.
§ Persons outside the United States should contact the appropriate authority having jurisdiction.
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
requirements more stringent than those required by the state. To evaluate the health
efects of products and drinking water additives from such products, state and local
agencies may use various references, including
1. An advisory program formerly administered by USEPA, Ofce of Drinking
Water, discontinued on Apr. 7, 1990.
2. Specifc policies of the state or local agency.
3. Two standards developed under the direction of NSF: NSF/ANSI 60,
Drinking Water Treatment Chemicals—Health Efects, and NSF/ANSI 61, Drinking
Water System Components—Health Efects.
4. Other references, including AWWA standards, Food Chemicals Codex,
Water Chemicals Codex,* and other standards considered appropriate by the state or
local agency.
Various certifcation organizations may be involved in certifying products in accordance with NSF/ANSI 61. Individual states or local agencies have authority to accept
or accredit certifcation organizations within their jurisdictions. Accreditation of certifcation organizations may vary from jurisdiction to jurisdiction.
Annex A, “Toxicology Review and Evaluation Procedures,” to NSF/ANSI 61 does
not stipulate a maximum allowable level (MAL) of a contaminant for substances not
regulated by a USEPA fnal maximum contaminant level (MCL). Te MALs of an
unspecifed list of “unregulated contaminants” are based on toxicity testing guidelines
(noncarcinogens) and risk characterization methodology (carcinogens). Use of Annex A
procedures may not always be identical, depending on the certifer.
ANSI/AWWA C509 does not address additives requirements. Tus, users of this
standard should consult the appropriate state or local agency having jurisdiction in
order to
1. Determine additives requirements including applicable standards.
2. Determine the status of certifcations by parties ofering to certify products
for contact with, or treatment of, drinking water.
3. Determine current information on product certifcation.
In an alternative approach to inadvertent drinking water additives, some jurisdictions (including California, Maryland, Vermont, and Louisiana at the time of
this writing) are calling for reduced lead limits for materials in contact with potable water. Various third-party certifers have been assessing products against these
* Both publications are available from National Academy of Sciences, 500 Fifth Street, NW,
Washington, DC 20001.
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
lead content criteria, and a new ANSI-approved national standard, NSF/ANSI 372,
Drinking Water System Components—Lead Content, was published in 2010. On
Jan. 4, 2011, legislation was signed revising the defnition for “lead free” within the
Safe Drinking Water Act (SDWA) as it pertains to “pipe, pipe fttings, plumbing fttings, and fxtures.” Te changes went into efect on Jan. 4, 2014. In brief, the new
provisions to the SDWA require that these products meet a weighted average lead
content of not more than 0.25 percent.
II.A. Chlorine and Chloramine Degradation of Elastomers. Te selection
of materials is critical for water service and distribution piping in locations where
there is a possibility that elastomers will be in contact with chlorine or chloramines.
Documented research has shown that elastomers such as gaskets, seals, valve seats, and
encapsulations may be degraded when exposed to chlorine or chloramines. Te impact
of degradation is a function of the type of elastomeric material, chemical concentration,
contact surface area, elastomer cross section, and environmental conditions as well as
temperature. Careful selection of and specifcations for elastomeric materials and the
specifcs of their application for each water system component should be considered to
provide long-term usefulness and minimum degradation (swelling, loss of elasticity, or
softening) of the elastomer specifed.
It is the responsibility of the user of an AWWA
standard to determine that the products described in that standard are suitable for use
in the particular application being considered.
III.A. Purchaser Options and Alternatives. Te following items should be
provided by the purchaser:
1. Standard used—that is, ANSI/AWWA C509, Resilient-Seated Gate Valves
for Water Supply Service, of latest revision.
2. Whether compliance with NSF/ANSI 372, Drinking Water System
Components—Lead Content, or an alternative lead content criterion, is required.
3. Whether or not the purchaser requires that the cast ferrous valve components be made of ductile iron.
4. Quantity required.
5. Special packaging for shipment as may be required for protection of coatings.
6. Whether the pH level of the water is less than 6.5 or greater than 8.5.
7. Size and type of valve, NRS or OS&Y (Sec. 1.1).
8. Whether or not the valve will be used in a corrosive environment (Sec. 1.1 .4)
determined by methods described in AWWA Manual M27.
II.
Special Issues.
III.
Use of Tis Standard.
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
9. Catalog data, net weight, and assembly drawings to be provided by the manufacturer (Sec. 4.1), if required.
10. Details of other federal, state, or provincial and local requirements (Sec. 4.2.1).
11. If test records of valve componet materials are required (Sec. 4.2.4.2).
12. Whether or not the valve will be subjected to water that reacts chemically
with materials used in these valves. Consultation with the manufacturer is advised to
determine the suitability in cases of doubt (Sec. 4.2.4.5.5).
13. Other coating requirements (Sec. 4.2.4.11) and whether coating (Sec. 4.5.2)
shall be NSF/ANSI 61 approved.
14. Cutter diameter must be specifed for tapping valves (Sec. 4.3.3).
Note: Tapping machine shell-cutters are made in either full size (outside diameter
[OD] is full nominal size) or undersize (OD is less than full nominal size, i.e., usually
½ in. (13 mm) less [MSS SP-113]). Te purchaser should specify the size of the shellcutter that the valve must accept.
15. Left blank intentionally to match AWWA C515 Purchaser Options and
Alternatives.
16. Type of valve ends—fanged, including dimensions (Sec. 4.4.1.4.1-2), spot
facing (Sec. 4.4.1 .4.1 -3), straddled bolt holes (Sec. 4.4.1.4.1-5), mechanical joint
(Sec. 4.4.1 .4.2), push-on joint (Sec. 4.4.1.4.3), tapping valve fange (Sec. 4.4.1.4.4),
and end fange requirements for tapping valves (Sec. 4.4.1 .4.4-3).
17. Whether bolting material with physical and chemical properties other than
AS TM A307 is required (Sec. 4.4.4). It is recommended that the purchaser verify with
the supplier the appropriateness of any alternative bolting materials required. What
alternative, if any, is desired in the type of rustproofng for bolts and nuts (Sec. 4.4.4.1).
18. Type of stem seal for NRS valves (Sec. 4.4.6.1) and for OS&Y valves
(Sec. 4.4.6.2).
19. Packing material requirements (Sec. 4.4.6.2.1).
20. Whether the valve is handwheel or wrench-nut operated and the direction in
which the handwheel or wrench nut shall turn to open (Sec. 4.4.7).
21. Detailed description of wrench nut, if not in accordance with Sec. 4.4.7.1 .
22. Whether gearing is required (Sec. 4.4.8).
23. Gear material requirements (Sec. 4.4.8.1).
24. If gear casing is required (Sec. 4.4.8.2).
25. If position indicators are required (Sec. 4.4.8.3).
26. Whether or not records of tests specifed in Section 5 are to be provided.
27. Special markings (Sec. 6.1 .1 .1 .1), if required.
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
fdavit of compliance (Sec. 6.3), if required.
28.
A
III.B.
Modifcation to Standard.
f
f
Any modi cation of the provisions, de nitions,
or terminology in this standard must be provided by the purchaser.
IV.
Major Revisions.
Major changes made to the standard in this revision
include the following:
1.
Changed “if required by the purchaser” to “when required in the purchase
documents.” User needs to call out options in its purchase document.
2.
Format was updated to comply with the Style Guide for AWWA standards
and harmonized with AWWA C515.
3.
Updated Applicability to address considerations regarding valve’s suitability
for wastewater applications.
4.
f
f
Updated de nition for Nominal Pipe Size and added de nition for Nominal
Valve Size.
5.
f
Added new de nition for Full Waterway and added new table for Minimum
Waterway Sizes.
6.
Added minimum yield strength and minimum elongation requirements for
ductile iron.
7.
Updated requirements for Coatings to include minimum average thickness.
8.
Added requirements for Permeation.
V.
Comments.
If you have any comments or questions about this standard,
please call AWWA Engineering and
Technical Services at 303.794.7711, FAX at
303.795.7603; write to the department at 6666 West Quincy Avenue, Denver, CO
80235 -3098; or email at standards@awwa.org.
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
Tis page intentionally blank.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
ANSI/AWWA C509-15
(Revi si on of AN SI /AW WA C5 0 9 - 0 9)
AWWA Standard
®
Resilient-Seated Gate Valves
for Water Supply Service
SEC TI ON 1 :
Sec. 1.1
G EN ER AL
Scope
Tis standard describes iron-body resilient-seated gate valves with nonrising
stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping
gate valves, for water supply service having a temperature range of 33° to 125°F
(0.6° to 52°C).
1.1 .1 Velocity. Tese valves are intended for applications where fuid velocity does not exceed 16 ft/sec (4.9 m/sec) when the valve is in the full-open position.
1.1 .2 Sizes. Gate valves described by this standard are 3-in. (75-mm)
through 36-in. (900-mm) nominal pipe size (NPS).
1.1 .3 Valve pressure rating. Te minimum design working water pressure shall be 200 psig (1,380 kPa [gauge]) for 3- through 12-in. (75- through
300-mm) sizes and 150 psig (1,034 kPa [gauge]) for 14- through 36-in. (350through 900-mm) sizes.
1.1 .4 Conditions and materials not covered. Tis standard is not intended
to describe special conditions of gate valve installation or operation, such as builtin power drive, installation in unusually corrosive soil, conveyance of unusually
corrosive water, excessive water hammer, frequent operation (as in flter service), or
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Copyright © 201 6 American Water Works Association. All Rights Reserved.
2
AWWA C5 09 -1 5
operation in a throttled position. Tese conditions are beyond the intended scope
of this standard and require special consideration in design and construction.
1.1 .5 Joint accessories. Joint accessories for end connections, such as bolts,
gaskets, glands, and follower rings, are not described in this standard.
Sec. 1.2
Purpose
Sec. 1.3
Application
Te purpose of this standard is to provide the minimum requirements for
resilient-seated gate valves for water supply service, including application, materials, design, testing, inspection, rejection, marking, and shipping.
Tis standard can be referenced in specifcations for purchasing and receiving
resilient-seated gate valves for water supply service.
1.3.1 Stipulations. Te stipulations of this standard apply when this document has been referenced and then only to resilient-seated gate valves for water
supply service.
1.3.2 Compatibility. Te valves encompassed by this standard require
considerations for compatibility with the material being conveyed from both
chemical and physical perspectives. Wastewater implies a lack of control over its
chemical and physical composition. Valves in compliance with this standard may
be suitable for wastewater applications; however, compliance does not ensure manufacturer approval of a specifc valve in wastewater applications. Suitability for a
specifc valve should be determined by analyzing a particular wastewater application in conjunction with the manufacturer.
SECTION 2:
REFERENCES
Tis standard references the following documents. In their latest editions,
they form a part of this standard to the extent specifed within the standard. In any
case of confict, the requirements of this standard shall prevail.
ANSI*/AWWA C110/A21.10—Ductile-Iron and Gray-Iron Fittings.
ANSI/AWWA C111/A21.11—Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings.
ANSI/AWWA C207—Steel Pipe Flanges for Waterworks Service, Sizes 4 In.
Trough 144 In. (100 mm Trough 3,600 mm).
* American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LI EN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
3
ANSI/AWWA C550—Protective Interior Coatings for Valves and Hydrants.
ANSI/AWWA C600—Installation of Ductile-Iron Mains and Teir Appurtenances.
ANSI/SAE* AS 568A—Aerospace Size Standard for O-Rings.
ASME† B16.1 —Gray Iron Pipe Flanges and Flanged Fittings: Classes 25,
125, and 250.
ASME B16.10—Face-to-Face and End-to-End Dimensions of Valves.
ASME B18.2.1 —Square, Hex, Heavy Hex, and Askew Head Bolts and Hex,
Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series).
ASME B18.2.3.1 M—Metric Hex Cap Screws.
ASME B18.3—Socket Cap, Shoulder, Set Screws, and Hex Keys (Inch Series).
ASME B18.3.1 M—Socket Head Cap Screws (Metric Series).
AS TM‡ A27/A27M-13—Standard Specifcation for Steel Castings, Carbon,
for General Application.
ASTM A126-04—Standard Specifcation for Gray Iron Castings for Valves,
Flanges, and Pipe Fittings.
ASTM A153/A153M-09—Standard Specifcation for Zinc Coating (HotDip) on Iron and Steel Hardware.
ASTM A276/A276M-15—Standard Specifcation for Stainless Steel Bars
and Shapes.
ASTM A307-14—Standard Specifcation for Carbon Steel Bolts, Studs, and
Treaded Rod 60,000 PSI Tensile Strength.
ASTM A380/A380M-13—Standard Practice for Cleaning, Descaling, and
Passivation of Stainless Steel Parts, Equipment, and Systems.
ASTM A395/A395M-99—Standard Specifcation for Ferritic Ductile Iron
Pressure-Retaining Castings for Use at Elevated Temperatures.
ASTM A473-15—Standard Specifcation for Stainless Steel Forgings.
ASTM A536-84—Standard Specifcation for Ductile Iron Castings.
ASTM A582/A582M-12e1—Standard Specifcation for Free-Machining
Stainless Steel Bars.
ASTM A743/A743M-13ae1—Standard Specifcation for Castings, IronChromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application.
* SAE International, 400 Commonwealth Drive, Warrendale, PA 15096.
† ASME International, 3 Park Avenue, New York, NY 10016.
‡ AS TM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
4
AWWA C5 09 -1 5
T
f
AS M B16/B16M-10 —Standard Speci cation for Free-Cutting Brass Rod,
Bar and Shapes for Use in Screw Machines.
T
f
AS M B62-15 —Standard Speci cation for Composition Bronze or Ounce
Metal Castings.
T
f
AS M B98/B98M-1 3 —Standard Speci cation for Copper-Silicon Alloy
Rod, Bar, and Shapes.
T
f
AS M B1 24/B1 24M-15 —Standard Speci cation for Copper and Copper
Alloy Forging Rod, Bar, and Shapes.
T
f
AS M B1 38/B1 38M-11 —Standard Speci cation for Manganese Bronze
Rod, Bar, and Shapes.
T
f
AS M B148-14—Standard Speci cation for Aluminum-Bronze Sand Castings.
T
AS M B154-1 2e1 —Standard
Test Method of Mercurous Nitrate Test for
Copper Alloys.
T
f
AS M B283/B283M-14a—Standard Speci cation for Copper and CopperAlloy Die Forgings (Hot-Pressed).
T
f
AS M B584-14 —Standard Speci cation for Copper Alloy Sand Castings for
General Applications.
T
f
AS M B633-1 3 —Standard Speci cation for Electrodeposited Coatings of
Zinc on Iron and Steel.
T
f
AS M B763/B763M-15 —Standard Speci cation for Copper Alloy Sand
Castings for Valve Applications.
T
f
AS M B824-14 —Standard Speci cation for General Requirements for
Copper Alloy Castings.
T
AS M D395 -14—Standard
Test Methods for Rubber Property—Compres-
sion Set.
T
AS M D429-14—Standard
to Rigid Substrates.
Test Methods for Rubber Property—Adhesion
T
Test Method for Rubber Property—Efect of
T
Test Methods for Rubber Deterioration—
AS M D471-15 —Standard
Liquids.
AS M D1149-07—Standard
Cracking in an Ozone Controlled Environment.
T
f
AS M D2000-1 2—Standard Classi cation System for Rubber Products in
Automotive Applications.
T
f
AS M DS56E/SAE HS-1086. 201 2. Metals and Alloys in the Uni ed Numbering System.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LI EN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
5
AWWA Manual M27—External Corrosion Control for Infrastructure
Sustainability.
Fed. Spec.* HH-P-106d—Packing; Flax or Hemp.
ISO 6509†—Corrosion of Metals and Alloys—Determination of Dezincifcation Resistance of Brass.
MSS‡ SP-9—Spot Facing for Bronze, Iron, and Steel Flanges.
MSS SP-60—Connecting Flange Joints Between Tapping Sleeves and Tapping Valves.
MSS SP-113—Connecting Joints Between Tapping Machines and Tapping
Valves.
NSF/ANSI§ 61—Drinking Water System Components—Health Efects.
NSF/ANSI 372—Drinking Water System Components—Lead Content.
SECTION 3:
DEFINITIONS
Te following defnitions shall apply in this standard:
1. Antiseize compound: A compound that aids in nondestructive assembly
and disassembly of threaded components.
2. Cosmetic defect: Blemishes that have no efect on the ability of the
component to meet the structural design and production test requirements of this
standard. Should the activities of plugging, welding, grinding, or repairing of the
blemish cause the component to fail these requirements, the blemish may not be
considered a cosmetic defect.
3. Flanged joint: Te fanged and bolted joint as described in ANSI/
AWWA C110/A21.1 0 or ASME B16.1 Class 125 or Sec. 4.4.1 .4.1 of this standard.
4. Full waterway: Te waterway through the entire length of the valve in
the full-open position that provides an unobstructed cylindrical fow path. Te
diameter of the fow path is equal to or larger than the nominal valve size.
5. Manufacturer: Te party that manufactures, fabricates, or produces
materials or products.
* Federal specifcations are available from Naval Publications and Form Center, 5801 Tabor Avenue, Philadelphia,
PA 19120.
† ISO standards are available from International Organization for Standardization, ISO Central Secretariat 1, ch. de
la Voie-Creuse CP 56 - CH-1211, Geneva 20, Switzerland.
‡ Manufacturers Standardization Society of the Valve and Fittings Industry, 127 Park Street, NE, Vienna, VA 22180.
§ NSF International, P.O. Box 130140, 789 North Dixboro Road, Ann Arbor, MI 48105.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
6
AWWA C5 09 -1 5
6. Mechanical joint: Te gasketed and bolted joint as described in ANSI/
AWWA C110/A21.10 or ANSI/AWWA C111/A21.11.
7. Nominal pipe size (NPS): A size identifcation number, not necessarily
the actual dimension that approximates the diameter of pipe.
8. Nominal valve size: Te size of valve expressed in inches or millimeters
as the integer value of the nominal pipe size (NPS) designation with which the end
connection of the valve is intended to be used.
9. Purchaser: Te person, company, or organization that purchases any
materials or work to be performed.
10. Push-on joint: Te single rubber-gasket joint as described in ANSI/
AWWA C111/A21.11.
11. Structural defect: Flaws that cause the component to fail the structural
design or test requirements of this standard. Tese include but are not limited to
imperfections that result in leakage through the walls of a casting, failure to meet
minimum wall thickness requirement, or failure to meet production tests.
12. Supplier: Te party that supplies materials or services. A supplier may
or may not be the manufacturer.
13. Tapping valve: A special gate valve designed with end connections and
an unobstructed waterway to provide proper alignment and positioning of a tapping sleeve, valve, and machine for tapping pipe dry or under pressure.
SECTION 4:
Sec. 4.1
REQUIREMENTS
Data to Be Supplied by the Manufacturer
When required in the purchase documents, the manufacturer shall provide
the following information when supplying iron-body resilient-seated gate valves.
4.1 .1 Catalog data. Te manufacturer shall supply catalog data, including illustrations and a parts list that identify the materials used for various parts.
4.1 .1 .1 Catalog detail. Te information shall be in sufcient detail to
serve as a guide in the assembly and disassembly of the valve and for ordering
repair parts.
4.1 .2 Weight information. Manufacturer shall provide a statement of the
net assembled weight for each size of valve exclusive of joint accessories.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LI EN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
7
4.1 .3 Assembly drawings. Manufacturer shall submit to the purchaser one
set of drawings showing the principal dimensions, construction details, and materials used for valve parts.
4.1 .3.1 Drawing review. Work shall be done and valves shall be provided
in accordance with these drawings after the drawings have been reviewed and
accepted by the purchaser.
Sec. 4.2
Materials
Materials used in valves produced according to this standard shall conform to
the requirements stipulated in the following sections.
4.2.1 General. Materials shall comply with the requirements of the Safe
Drinking Water Act and other federal regulations for potable water and reclaimed
water systems, as applicable.
4.2.2 Permeation. Te selection of materials is critical for potable water,
wastewater, and reclaimed water service and distribution piping in locations where
there is likelihood that the pipe will be exposed to signifcant concentrations of
pollutants composed of low-molecular-weight petroleum products or organic solvents or their vapors. Research has documented that pipe materials such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement and elastomers,
such as used in jointing gaskets and packing glands, are subject to permeation by
lower-molecular-weight organic solvents or petroleum products. If a potable water,
wastewater, or reclaimed water pipe must pass through such a contaminated area
or an area subject to contamination, consult with the manufacturer regarding permeation of pipe walls, jointing materials, and so forth before selecting materials for
use in that area.
4.2.3 Dissimilar metals. In the presence of an electrolyte, direct contact
between metals of dissimilar corrosion resistance may result in galvanic corrosion
of the more active, less corrosion-resistant material.
4.2.3.1 Selection of materials. When dissimilar metals must be used for
internal parts, the rate of corrosion shall be reduced as much as practical through
the selection of materials that exhibit similar resistance to corrosion, by placing a
dielectric material between metals, or by applying a dielectric coating.
4.2.3.2 Water quality or premature failure. When contact between dissimilar metals cannot be avoided, the assembly shall be designed so that the resulting corrosion will be minimized and will not adversely afect water quality or result
in malfunctioning or premature failure of the assembly.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
8
AWWA C5 09 -1 5
4.2.4 Physical and chemical properties. Te requirements of AWWA,
ANSI, AS TM, or other standards referenced in this text shall govern the physical
and chemical characteristics of the valve components.
4.2.4.1 Testing. Whenever valve components are to be made in conformance with AWWA, ANSI, AS TM, or other standards that include test requirements or testing procedures, the manufacturer or supplier shall comply with those
procedures.
4.2.4.2 Test records. Records of tests performed shall, if required by the
purchase documents, be made available to the purchaser.
4.2.4.3 Gray iron. Gray iron shall conform to or exceed the requirements
of AS TM A126 Class B.
4.2.4.4 Ductile iron. Ductile iron shall conform to the requirements of
AS TM A395 or AS TM A536. In addition, ductile iron shall have a minimum yield
strength of 45,000 psi and minimum elongation of 5 percent.
4.2.4.5 Copper alloys. Copper alloys used in valves shall comply with the
following:
4.2.4.5.1 Copper alloy valve components shall be made to AS TMrecognized alloy specifcations with unifed numbering system (UNS)* for metals and alloys designations.
4.2.4.5.2 Copper alloys are not limited to those specifed in this standard.
4.2.4.5.3 Copper alloys must meet the performance requirements of this
standard including minimum yield strength, chemical requirements, and corrosion resistance.
4.2.4.5.4 Any copper alloy used in the cold-worked condition shall be
capable of passing the mercurous nitrate test in accordance with AS TM B154 to
minimize susceptibility to stress corrosion.
4.2.4.5.5 Waters in some areas have been shown to promote corrosion in
the form of dezincifcation or dealuminization of copper alloys. Te manufacturer should be notifed if this condition exists. Copper alloys that contain more
than 16 percent zinc shall not be used in these waters unless specimens of the
alloy tested in accordance with ISO 6509 exhibit dezincifcation depth of less
than 25 µm. If aluminum bronze is used, the alloys shall be inhibited against
dealuminization.
* Joint publication of AS TM and SAE (AS TM DS56E/SAE HS-1086, 2012).
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LI EN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
9
4.2.4.5.6 Copper alloys that contain more than 16 percent zinc shall not
contain less than 57 percent copper.
4.2.4.5.7 Copper alloys that contain 16 percent or less zinc shall not contain less than 79 percent copper.
4.2.4.5.8 Valve components manufactured from some grades of manganese, bronze, or some other materials are subject to stress corrosion. Te manufacturer shall design the valve and select materials to minimize stress corrosion.
4.2.4.5.9 Copper alloys that contact drinking water shall comply with the
Safe Drinking Water Act.
4.2.4.6 Carbon steel. Carbon steel castings, when used, shall conform to
the requirements of AS TM A27 Grade U-60-30 or equivalent.
4.2.4.7 Stainless steel. Stainless steel used in valves shall comply with the
following:
4.2.4.7.1 Te chemical composition of stainless-steel valve components
shall contain not less than 15 percent chromium or more than 0.25 percent carbon
and shall be processed to reduce the formation of chromium carbides.
4.2.4.7.2 Stainless-steel valve components shall be made to AS TMrecognized alloy specifcations with metal and alloys in the unifed numbering
system (UNS).
4.2.4.7.3 Stainless-steel alloys are not limited to those specifed herein.
4.2.4.7.4 Stainless-steel alloys must meet the performance requirements of
this standard including the minimum yield strength and chemical requirements.
4.2.4.7.5 After fnal forming and machining, exogenous iron shall be
removed from fnished stainless-steel components that come in contact with water
or those components shall be passivated in accordance with AS TM A380.
4.2.4.7.6 Other stainless-steel components shall be cleaned and descaled in
accordance with the manufacturer’s requirements.
4.2.4.8 Gaskets. Gasket material shall be made of inorganic mineral
fber, natural or synthetic rubber composition, or paper that is free from corrosive
ingredients.
4.2.4.9 O-rings. O-rings or other suitable elastomeric seals may be used.
4.2.4.9.1 O-rings shall meet the requirements of ASTM D2000 and have
physical properties suitable for the application.
4.2.4.10 Watertightness. Gaskets, O-rings, or other suitable elastomeric
seals shall be used on fanged joints intended to be watertight.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
10
AWWA C5 09 -1 5
Sec. 4.3
4.2.4.11 Coatings. Unless otherwise specifed by the purchaser, valve
coatings, as required in Sec. 4.5.2, shall be water-based enamel coating, black
asphalt coating, or epoxy coating except as required by Sec. 4.4.1 .3.
4.2.4.1 2 Elastomers. Elastomers shall comply with the following:
1. Rubber seats shall be resistant to microbiological attack, copper poisoning, and ozone attack.
2. Rubber-seat compounds shall contain no more than 8 ppm of copper ion
and shall include copper inhibitors to prevent copper degradation of the rubber
material.
3. Rubber-seat compounds shall be capable of withstanding an ozone
resistance test when tested in accordance with AS TM D1149. Te tests shall be
conducted on unstressed samples for 70 hours at 104°F (40°C) with an ozone concentration of 500 ppb without visible cracking in the surfaces of the test samples
after a test.
4. Rubber-seat compounds shall have a maximum compression set value of
20 percent when tested in accordance with AS TM D395 Method B for 22 hours
at 158°F (70°C).
5. Rubber-seat compounds shall contain no more than 1.5 parts of wax
per 100 parts of rubber hydrocarbon, and shall have less than 2 percent volume
increase when tested in accordance with AS TM D471 after being immersed in
distilled water at 73.4°F ± 2°F (23°C ± 1°C) for 70 hours. Reclaimed rubber shall
not be used.
6. Rubber-seat compounds shall be free of vegetable oils, vegetable oil derivatives, animal fats, and animal oils.
General Design
4.3.1 Structural design. Valve parts shall be designed to withstand, without being structurally or otherwise damaged, (1) an internal test pressure of twice
the rated design working pressure of the valve; and (2) the full-rated internal working pressure when the closure member is cycled once from a fully open to a fully
closed position against the full-rated unbalanced working water pressure.
4.3.2 Stem torque. Te valve assembly and mechanism shall be capable of
withstanding a design valve stem input torque as shown in Table 1.
4.3.3 Size ofwaterway.
4.3.3.1 Valves shall have a full waterway the minimum diameter of which
is in accordance with Table 2.
4.3.3.2 Pigging and tapping.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
Table 1
Design torque
Nominal Valve Size
in.
3–4
6–16
Larger than 16
*
(75–100)
(150–400)
(400)
Design Torque
(mm)
ft-lb
(Nm)
200
300
* Nominal valve size mm is soft conversion (nominal in. size × 25).
† Torque Nm is rounded to nearest 5 Nm (ft-lb × 1.356).
Table 2
Minimum full waterway sizes
†
(270)
(405)
Consult Manufacturer
Nominal Valve Size
Diameter
Nominal Valve Size
Diameter
in.
(in.)
mm
(mm)
3
4
6
8
10
12
14
16
18
20
24
30
36
3.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
20.00
24.00
30.00
36.00
11
75
100
150
200
250
300
350
400
450
500
600
750
900
76.2
101.6
152.4
203.2
254.0
304.8
355.6
406.4
457.2
508.0
609.6
762.0
914.4
4.3.3.2.1 For piplines to be cleaned by pigging and for tapping valves, the
size of the waterway shall include appropriate clearance for the diameter of the pig or
the diameter of the tapping machine cutter recommended by the valve manufacturer.
4.3.3.2.2 Since some tapping valves may require an undersized cutter,
which is smaller than the nominal diameter of the valve, the valve manufacturer
shall publish the maximum size cutter for each valve size.
Sec. 4.4
Detailed Design
4.4.1 Body and bonnet.
4.4.1 .1 Material. Te body and bonnet shall be made of gray iron or
ductile iron.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
12
AWWA C5 09 -1 5
Table 3
Minimum thickness of body and bonnet
Nominal Valve Size
in.
3
4
6
8
10
12
14
16
18
20
24
30
36
*
(75)
(100)
(150)
(200)
(250)
(300)
(350)
(400)
(450)
(500)
(600)
(750)
(900)
(mm)
* Nominal valve size mm is soft conversion (nominal in. size × 25).
† Minimum metal thickness mm is hard conversion (in. × 25.4).
Minimum Metal Tickness
in.
0.37
0.40
0.43
0.50
0.63
0.68
0.75
0.85
0.94
0.97
1.08
1.39
1.5 4
(mm)
(9.4)
(10.2)
(10.9)
(12.7)
(16.0)
(17.3)
(19.1)
(21.6)
(23.9)
(24.6)
(27.4)
(35.3)
(39.1)
†
4.4.1 .2 Shell thickness. Shell thickness at no point shall be more than
12.5 percent thinner than the minimum metal thickness stated in Table 3.
4.4.1 .2.1 No continuous area of defcient thickness shall exceed 12.5 percent of the pressure-containing shell area of the casting.
4.4.1 .3 Body seating surfaces. Resilient seats shall seal against a corrosion-resistant surface.
4.4.1 .3.1 Te surface may be either metallic or nonmetallic, applied in a
manner to withstand the action of the line fuids and the operation of the sealing
gate during long-term service.
4.4.1 .3.2 A metallic surface shall have a corrosion resistance equivalent to
or better than that of bronze.
4.4.1 .3.3 A nonmetallic surface shall be epoxy coating.
4.4.1 .4 Valve end connections. Except as agreed on by the purchaser and
supplier, valve end connections shall conform to the requirements of one of the
following end connection types.
4.4.1 .4.1 Flanged ends:
1. Tickness
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RESILI EN T-SE ATED G ATE VALVES FOR WATER SUPPLY SERVI CE
Table 4
13
Minimum thickness for ductile-iron connecting end fanges
Nominal Valve Size
in.
4
6
8
10
12
14
16
18
20
24
30
36
*
(100)
(150)
(200)
(250)
(300)
(350)
(400)
(450)
(500)
(600)
(750)
(900)
(mm)
* Nominal valve size mm is soft conversion (nominal in. size × 25).
† Flange thickness mm is hard conversion (in. × 25.4).
Flange Tickness
in.
¾
¾
7⁄8
15/1 6
1
1
1
1
11 ⁄8
13/ 6
1
1¾
1
3
(mm)
†
(19.1)
(19.1)
(22.2)
(23.8)
(25.4)
(25.4)
(25.4)
(25.4)
(28.6)
(30.1)
(34.9)
(44.5)
a. Te thickness for gray-iron end fanges may not be less than specifed in
ASME B16.1 or ANSI/AWWA C110/A21.08.
b. Tickness of ductile-iron end fanges may be less than specifed in ASME
B16.1 or ANSI/AWWA C110/A21.1 0 but not less than shown in Table 4.
2. Other dimensions and drilling of end fanges of fanged valves shall conform to ASME B16.1 Class 125, ANSI/AWWA C207, or ANSI/AWWA C110/
A21.10 except as modifed by the purchase documents.
3. Unless spot facing is required by the purchase documents, the bolt holes
of the end fanges shall not be spot faced except:
a. When the thickness at any point within the spot-face area, as defned in
MSS SP-9, exceeds the required minimum fange thickness by more than indicated
in Table 5 or if the fange is not sufciently fat.
b. When the bearing surfaces for bolting, as defned as the minimum spotface diameter according to bolt size in MSS SP-9, are not parallel within 3 degrees
of the fange face.
c. If the foregoing requirements are not met, either spot facing or backfacing
shall be used to meet the requirements.
4. When required, spot facing shall be done in accordance with MSS SP-9.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
14
AWWA C5 09 -1 5
Table 5
Excess fange thickness
Nominal Valve Size
in.
3–12
14–24
30–36
*
(100–300)
(350–600)
(750–900)
(mm)
* Nominal valve size mm is soft conversion (nominal in. size × 25).
† Excess thickness mm is hard conversion (in. × 25.4).
Excess Tickness
in.
1
3/1 6
¼
(mm)
†
(3.2)
(4.8)
(6.4)
5. Bolt holes shall straddle the vertical centerline of the valve, unless otherwise specifed by the purchaser.
6. Te laying lengths of fanged valves 12 in. (300 mm) and smaller shall
conform to the requirements for double-disc gate valves listed in Table 1 of ASME
B16.10.
4.4.1 .4.2 Mechanical-joint ends:
1. Mechanical-joint bell dimensions shall conform to ANSI/AWWA C111/
A21.11.
2. Slots with the same width as the diameter of the bolt holes may be provided instead of holes in the bell fange where the valve body and bonnet interfere
with the joint assembly.
4.4.1 .4.3 Push-on joints shall conform to the requirements of ANSI/
AWWA C111/A21.11.
4.4.1 .4.4 Tapping valve ends:
1. Te end fange of a tapping valve that forms a joint with the tapping sleeve
shall conform to the dimensions of MSS SP-60 in sizes 3-in. (75-mm) through
12-in. (300-mm) NPS. For larger sizes, fange dimensions shall be as agreed to by
the purchaser and supplier.
2. Te connecting fange of the tapping valve mating with the tapping
machine must be parallel and concentric with the opposite fange and concentric
with the waterway to provide proper alignment for the tapping operation.
3. Te end fange of a tapping valve that forms a joint with the tapping
machine shall conform to the dimensions of MSS SP-113.
4.4.1 .5 Yokes on OS&Y valves. On OS&Y valves, the yokes on bonnets
may be integral or of bolted-on construction.
4.4.1 .5.1 If the yoke is not an integral part of the bonnet, it shall be made
of ductile iron or gray iron.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESILI EN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
15
4.4.1 .5.2 Te design shall be such that a hand cannot be jammed between
a yoke and the handwheel.
4.4.2 Gate. Te material of the gate shall be ductile iron, gray iron, or
copper alloy (see Table 6 for copper alloys).
4.4.2.1 Resilient seats. Resilient seats shall be bonded or mechanically
attached to the gate.
4.4.2.1 .1 Te proof-of-design test method used for bonding or vulcanizing
shall be AS TM D429, either Method A or Method B.
4.4.2.1 .2 For Method A, the minimum strength shall not be less than
250 psi (1,725 kPa).
4.4.2.1 .3 For Method B, the peel strength shall not be less than 75 lb/in.
(13.2 N/mm).
4.4.2.1 .4 Exposed mechanical attaching devices and hardware used to
retain the resilient seat shall be of a corrosion-resistant material.
4.4.3 Guides. If guiding is required to obtain shutof, the design shall be
such that corrosion in the guide area does not afect seating.
4.4.4 Bolting. Bolting materials, excluding joint accessories, shall meet
the mechanical strength requirements of AS TM A307 and shall have either regular square, hexagonal, or socket heads with dimensions conforming to ASME
B18.2.1 , ASME B18.2.3.1 M, ASME B18.3, or ASME B18.3.1 M.
4.4.4.1 Corrosion resistance. Bolts, studs, and nuts shall be zinc-coated
(ASTM A153 or AS TM B633) or made corrosion resistant by some other process
disclosed to and acceptable to the purchaser.
4.4.4.1 .1 Te purchaser may specify bolts, studs, and nuts made from a
specifed corrosion-resistant material, such as low-zinc bronze, nickel-copper alloy,
or stainless steel.
4.4.4.1 .2 Stainless-steel bolts and studs shall not be used on stainless-steel
nuts unless the threads are coated with an antiseize compound or the fastening
components are made of diferent alloys or some other means are used to prevent
galling.
4.4.4.2 Recessed sockets. Recessed socket in bolts shall be plugged and/
or sealed.
4.4.5 Stem, stem nut, and thrust collar. Copper-alloy stems, stem nuts,
thrust collars, and gates shall be made from an alloy listed in Table 6.
4.4.5.1 Stainless-steel stems. Stainless-steel stems shall be made from an
alloy listed in Table 7.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
16
AWWA C5 09 -1 5
Table 6
Stem gate, thrust collar, and stem nut copper alloys
Copper Alloy*
AS TM Specifcation Number
Alloy Designation
AS TM B16
UNS C36000
AS TM B138
UNS C67500
Stems, Gates, and Trust Collars AS TM B283
UNS C67600
AS TM B98
UNS C66100
UNS C86200
AS TM B148
UNS C95200
UNS C95300
UNS C95500
AS TM B584
UNS C86200
UNS C86500†
UNS C86700†
UNS C87500
UNS C87600
UNS C87610
AS TM B763
UNS C86200†
UNS C86500†
UNS C86700
UNS C99400
UNS C99500
AS TM B62
UNS C83600 †
AS TM B824
UNS C84400
Stem Nuts and Gates
AS TM B124
UNS C37700
AS TM B148
UNS C95200
UNS C95300
UNS C95500 †
AS TM B584
UNS C84400
UNS C83450
UNS C86700†
UNS C87500
UNS C87610 †
AS TM B763
UNS C86500†
UNS C86700
UNS C95200
UNS C95500
UNS C95800
UNS C99400
UNS C99500
* Alloys actually used or specifed are not limited to those listed—see Sec. 4.2.4.5.2.
† Compliance with ANSI/AWWA C509 requires the manufacturer to specify minimum mechanical (yield
strength) or chemical (copper and/or zinc) requirements that exceed the minimums required for this alloy by
the AS TM specifcation(s) listed.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESILI EN T-SE ATED G ATE VALVES FOR WATER SUPPLY SERVI CE
Table 7
Stainless-steel valve stem alloys
AS TM Specifcation Number
A276
A276
A276
A473
A473
A582
A743/A743M
A743/A743M
17
Alloy Designation*
UNS S30400
UNS S31600
UNS S43100
UNS S30400
UNS S31600
UNS S43020
CF8 J92600
CF8M J92900
* Alloys actually used or specifed are not limited to those listed—see Sec. 4.2.4.7.
4.4.5.1 .1 When stainless-steel stems are used, the stem, stem nut, and
thrust collar materials shall be selected to prevent galling when subjected to the
torques given in Table 11 (see page 23).
4.4.5.2 Stem yield strength. Valve stems shall have a yield strength of
20,000 psi (137,800 kPa) or greater.
4.4.5.3 Stem nuts. Stem nuts shall be made from copper alloys that have
a yield strength of 14,000 psi (96,500 kPa) or greater (see Table 6).
4.4.5.4 NRS stems. Te stem must have a thrust collar that shall be integral or nonintegral with the stem.
4.4.5.5 OS&Y stems. OS&Y valve stems shall be of sufcient length so as
to be at least fush with the top of the stem nut after the gate is fully closed.
4.4.5.5.1 Te design shall prevent any possibility of the gate leaving the
stem or the stem turning during the operation of the valve.
4.4.5.6 Treads. Te threads of stems and stem nuts shall be of Acme,
modifed Acme, stub Acme, or one-half V type.
4.4.5.6.1 Stems and stem nuts shall be threaded straight and true and shall
work true and smooth throughout the lift of opening and thrust of closing the valve.
4.4.5.7 Diameter. Te stem diameters and turns to open shall be as
shown in Table 8.
4.4.6 Stem sealing. Te sealing system shall be designed to be watertight
at the rated working pressure of the valve.
4.4.6.1 NRS valves.
4.4.6.1 .1 A stem-seal plate or O-ring packing plate shall be made of ductile
iron or gray iron.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
18
AWWA C5 09 -1 5
Table 8
Minimum diameter of stem and minimum number of turns to open
OS&Y Valves
Minimum Minimum Diameter of Stem Minimum
Minimum Diameter Number
Unthreaded Section and Number
of
T
urns
of Turns
Nominal Valve Size
of Stem*
Tread OD§
of
Stem
of Stem
†
‡ to Open
‡
to Open¶
3
(75) 0.859 (21.82)
9
¾
(19.1)
7
4 (100) 0.859 (21.82) 12
1
(25.4)
9
6 (150) 1.000 (25.40) 18
11
(28.6)
18
8 (200) 1.000 (25.40) 24
1¼
(31.8)
25
10 (250) 1.1 25 (28.58) 30
13
(34.9)
31
12 (300) 1.188 (30.18) 36
13
(34.9)
37
14 (350) 1.438 (36.53) 48
1½
(38.1)
48
16 (400) 1.438 (36.53) 48
1½
(38.1)
48
18 (450) 1.750 (44.45) 40
2
(50.8)
40
20 (500) 1.750 (44.45) 40
2
(50.8)
40
24 (600) 1.969 (50.01) 48
2¼
(57.2)
48
30 (750) 2.188 (55.58) 60
2½
(63.5)
60
36 (900) 2.500 (63.5 0) 72
N/A**
N/A
N/A
in.
NRS Valves
(mm)
in.
(mm)
in.
(mm)
* Te diameter of the stem at the base of the thread or at any point below that portion shaped to receive the
wrench nut or gear on NRS valves or the minimum diameter of the stem unthreaded section and thread OD
for OS&Y valves shall not be less than specifed.
† Nominal valve size mm is soft conversion (nominal in. size × 25).
‡ Stem diameter mm is hard conversion (in. × 25.4).
§ Outside diameter.
¶ Values shown for 6- through 12-in. nominal valve size are for single-lead threads. If a double-lead thread is
used, minimum turns become 13, 17, 21, and 25 for sizes 6- through 12-in. nominal valve size inclusive.
** N/A = not applicable
4.4.6.1.2 Stem openings, if bushed, or stem-seal cartridges shall be of a copper alloy or a synthetic polymer with physical properties suitable for the application.
4.4.6.1 .3 Stem-seal plate bolts and nuts shall conform to the requirements
as specifed in Sec. 4.4.4.
4.4.6.1 .4 On NRS valves, the stem opening, thrust bearing recess, and
bonnet face of the stem-seal plate shall be machined or fnished in a manner that
will provide surfaces that are smooth and either parallel or perpendicular to the
stem axis within 0.5 degrees.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESILI EN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
19
4.4.6.1 .5 When an O-ring or other pressure-actuated stem seal is used, the
design shall incorporate at least two such seals.
4.4.6.1 .6 Te dimensions of the O-rings shall be in accordance with ANSI/
SAE AS 568A.
4.4.6.2 OS&Y valves. A stufng box shall be provided to contain stem
packing.
4.4.6.2.1 Stufng-box packing shall be made of fax conforming to Fed.
Spec. HH-P-106d. Hemp, asbestos, or jute packing shall not be used.
4.4.6.2.2 Stufng boxes shall have a depth not less than the diameter of
the valve stem.
4.4.6.2.3 Te internal diameter of the stufng box shall be large enough to
contain adequate packing to prevent leakage around the stem.
4.4.6.2.4 Stufng boxes shall be packed properly and ready for service
when valves are delivered to the purchaser.
4.4.6.2.5 Stufng-box bolts may need to be adjusted to stop leakage at the
time of installation.
4.4.6.3 Packing glands, gland followers, gland bolts, and gland-bolt nuts.
Te packing gland assembly shall be of solid, solid-bushed, or two-piece designs.
4.4.6.3.1 Followers may be formed as a fanged end on the gland or as a
separate item.
4.4.6.3.2 Packing glands shall be made of a copper alloy, synthetic polymer, gray iron, or ductile iron.
4.4.6.3.3 If a gland follower is used, it shall be made of either ductile iron
or gray iron or a copper alloy.
4.4.6.3.4 Gland bolts and nuts shall be according to Sec. 4.4.4.
4.4.6.3.5 Gland-bolt nuts shall be made of a copper alloy or stainless steel.
4.4.6.4 Stem-seal replacement.
4.4.6.4.1 NRS valves shall be designed so that the seal above the stem collar can be replaced with the valve under pressure in the fully open position.
4.4.6.4.2 Design of OS&Y valves shall be such that the stufng box can be
packed when the valves are in the fully open position and under pressure.
4.4.7 Wrench nuts and handwheels. Except as shown in Sec. 4.4.8.6,
wrench nuts and handwheels shall be made of gray iron or ductile iron.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
20
AWWA C5 09 -1 5
Table 9
Outside diameter of handwheels*
Nominal Valve Size
in.
3
4
6
8
10
12
(mm)
(75)
(100)
(150)
(200)
(250)
(300)
Minimum Diameter of Handwheel
†
in.
* For sizes larger than 12 in. (300 mm), consult the manufacturer.
† Nominal valve size mm is soft conversion (nominal in. size × 25).
‡ Handwheel diameter mm is hard conversion (in. × 25.4).
7
10
12
14
16
16
(mm)
‡
(178)
(254)
(305)
(356)
(406)
(406)
4.4.7.1 Nuts. Unless otherwise explicitly required by the purchase documents, the wrench nuts shall be 115/ 6-in. (49.2-mm) square at the top, 2-in.
(50.8-mm) square at the base, and 1¾-in. (44.5 -mm) high.
4.4.7.1 .1 Nuts shall have a fanged base on which shall be cast an arrow at
least 2-in. (50.8-mm) long showing the direction of the opening.
4.4.7.1 .2 Te word “OPEN” in ½-in. (12.7-mm) or larger letters shall be
cast on the nut to indicate clearly the direction to turn the wrench when opening
the valve.
4.4.7.2 Handwheels. Handwheels shall be ofthe spoke type only. Webbed
or disc types are not permissible.
4.4.7.2.1 Te outside diameter of handwheels shall not be less than those
given in Table 9.
4.4.7.2.2 An arrow showing the direction to turn the handwheel to open
the valve, with the word “OPEN” in ½-in. (12.7-mm) or larger letters in a break in
the arrow shaft, shall be cast on the rim of the handwheel so as to be read easily.
4.4.7.3 Operating mechanism. NRS valves are to be supplied with
wrench nuts or handwheels. OS&Y valves are to be supplied with handwheels.
4.4.7.4 Direction of opening. Te standard direction of opening is counterclockwise as viewed from the top. Valves opening in the opposite direction
(clockwise) may be specifed.
4.4.7.5 Method of securing. Wrench nuts or handwheels shall be ftted
to the valve stem on NRS valves. Handwheels shall be ftted to the stem nut on
OS&Y valves. In both cases, they shall be secured by mechanical means.
1
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESILI EN T-SE ATED G ATE VALVES FOR WATER SUPPLY SERVI CE
21
4.4.7.6 Color coding. Wrench nuts and handwheels that open the valve
by turning to the right (clockwise) shall be painted red, and wrench nuts and
handwheels that open the valve by turning to the left (counterclockwise) shall be
painted black.
4.4.8 Gearing. If gears are required by the purchase documents, they
shall be accurately formed and smooth running, with a pinion shaft operating in a
bronze, self-lubricating, or permanently sealed antifriction bearing.
4.4.8.1 Material. Geared valves shall be equipped with steel, ductile-iron,
or gray-iron gears.
4.4.8.1 .1 If cast-iron gears are provided, the pinion shall be steel.
4.4.8.1 .2 Material for steel gears shall be AS TM A27 Grade U-60-30 or
equivalent.
4.4.8.2 Gear cases. Valves using O-ring or V-type stem seals may have
the gear case attached directly to the valve.
4.4.8.2.1 When geared valves are provided, enclosed gear cases are required
unless defnitely excluded by the purchaser’s requirements.
4.4.8.3 Indicators. When required by the purchaser, geared valves shall
be equipped with indicators to show the position of the gate in relation to the
waterway.
4.4.8.4 Gear ratio. Gear ratios shall not be less than those shown in
Table 10.
4.4.8.5 Input torque. Te maximum input torque shall be as recommended by the manufacturer.
4.4.8.6 Wrench nut/handwheel. Geared valves may have a fabricated
wrench nut or handwheel with an “open” direction tag and arrow mechanically
secured.
4.4.9 Bypasses. Bypass sizes vary depending on the type of bypass and the
manufacturer’s valve design.
Table 10 Gear ratios
in.
16–24
30–36
Nominal Valve Size
*
(400–600)
(750–900)
(mm)
* Nominal valve size mm is soft conversion (nominal in. size × 25).
Minimum Gear Ratio
2:1
3:1
Copyright © 201 6 American Water Works Association. All Rights Reserved.
22
AW WA C5 09 -1 5
4.4.9.1 Size. If a bypass is required by the purchase documents, the
bypass size shall be by agreement between the purchaser and the manufacturer.
Sec. 4.5
Fabrication
4.5.1 Workmanship. Valve parts shall conform to their required dimensions and shall be free from defects that could prevent proper functioning of the
valve.
4.5.1 .1 Interchangeable parts. Like parts of valves of the same model and
size produced by the same manufacturer shall be interchangeable.
4.5.1 .2 Castings. Castings shall be clean and sound without defects that
will weaken their structure or impair their service.
4.5.1 .2.1 Plugging, welding, or repairing of cosmetic defects is allowed.
4.5.1 .2.2 Repairing of structural defects is not allowed unless agreed to by
the purchaser.
4.5.1 .2.3 Repaired valves shall comply with the testing requirements of this
standard.
4.5.2 Coating. Interior ferrous surfaces of the body and bonnet that are
in contact with liquid shall be coated with a material conforming to the qualifcation testing requirements of ANSI/AWWA C550 to a minimum average dry flm
thickness of 6 mil.
4.5.2.1 Other exposed interior ferrous surfaces. Other exposed interior
ferrous surfaces except fnished or bearing surfaces shall be coated with a material
specifed in Sec. 4.2.4.11.
4.5.2.2 Exterior ferrous surfaces. A coating material as specifed in
Sec. 4.2.4.11 shall be applied to exterior ferrous surfaces.
SECTION 5:
Sec. 5.1
VERIFICATION
Testing
5.1 .1 Proof-of-design testing.
5.1 .1 .1 Hydrostatic gate test. One prototype valve of each size and class
of the manufacturer’s design shall be hydrostatically tested with twice the specifed
rated pressure applied to one side of the gate and zero pressure on the other side.
5.1 .1 .1 .1 Te test is to be made in each direction across the gate for a minimum period of 5 minutes.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
Table 11 Proof-of-design torque
Nominal Valve Size
in.
3–4
6–12
14–24
30
36
*
(75–100)
(150–300)
(350–600)
(750)
(900)
(mm)
* Nominal valve size mm is soft conversion (nominal in. size × 25).
† Torque Nm is rounded to nearest 5 Nm (ft-lb × 1.356).
Proof-of-Design Torque
ft. -lb
250
350
400
500
600
(Nm)
23
†
(340)
(475)
(545)
(680)
(815)
5.1 .1 .1 .2 Te manufacturer may make special provisions to prevent leakage
past the seats.
5.1 .1 .1 .3 No part of the valve or gate shall remain visually deformed by the
test.
5.1 .1 .2 Torque test. A prototype of each size shall be overtorqued in the
closed and open positions to demonstrate that no distortion of the valve stem or
thrust collar or damage to the resilient seat occurred as evidenced by the failure to
seal at the rated pressure.
5.1 .1 .2.1 Te torque applied to the main valve stem shall be in accordance
with Table 11.
5.1 .1 .2.2 For valves using stainless-steel stems, upon disassembly, there
shall be no visible evidence of galling on the stem, thrust collar, or stem nut after
completion of the torque test.
5.1 .1 .3 Leakage test. One prototype valve of each size shall be fully
opened and closed to a seal for 500 complete cycles with sufcient fow that the
valve is at the rated working pressure for the pressure diferential at the point of
closing.
5.1 .1 .3.1 Te valves shall be drip-tight under the rated pressure diferential
applied alternately to each side of the gate after the completion of the tests.
5.1 .1 .4 Hydrostatic shell test. One prototype of each valve size shall be
tested to 2.5 times the rated working pressure with the gate in the open position.
5.1 .1 .4.1 For a period of 5 minutes, there shall be no rupture or cracking of
the valve body, valve bonnet, or seal plate.
5.1 .1 .4.2 Leakage at pressure-containing joints shall not be a cause for failure of the test.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
24
AWWA C5 09 -1 5
5.1 .1 .4.3 No part of the valve shall remain visibly deformed after the test.
5.1 .2 Production testing. After manufacture, each gate valve shall be subjected to operation and hydrostatic tests at the manufacturer’s plant as specifed in
this section.
5.1 .2.1 Operation test. Each valve shall be operated through a complete
cycle to ensure proper functioning of parts.
5.1 .2.1 .1 Any defects in workmanship shall be corrected, and the test
repeated until a satisfactory performance is demonstrated.
5.1 .2.2 Shell test. A hydrostatic test pressure equal to twice the rated
working pressure of the valve shall be applied to the assembled valve with the gate
in the open position.
5.1.2.2.1 Te test shall show no leakage through the metal pressurecontaining joints or stem seals.
5.1 .2.3 Seat test. A hydrostatic test shall be made from each direction at
a minimum of the rated working pressure to prove the sealing ability of each valve
from both directions of fow.
5.1.2.3.1 Te test shall show no leakage through the metal pressurecontaining joints or past the seat.
Sec. 5.2
Plant Inspection and Rejection
5.2.1 Plant inspection. Work performed according to this standard,
except prototype testing, shall be subject to inspection and acceptance by the purchaser, who shall have access to places of manufacture where these valves are being
produced and tested.
5.2.2 Rejection. Any valve or part that may be determined as not conforming to the requirements of this standard shall be made satisfactory, or it shall
be rejected and repaired or replaced by the manufacturer.
5.2.2.1 Repair. Repaired valves must be acceptable to the purchaser and
specifcally accepted when submitted or resubmitted.
5.2.3 Afdavit ofcompliance. Whether the purchaser has a representative
at the plant or not, an afdavit of compliance may be required from the manufacturer as provided in Sec. 6.3 of this standard.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
SECTION 6:
25
DELIVERY
Sec. 6.1
Marking
Sec. 6.2
Preparation for Shipment
Sec. 6.3
A davit of Compliance
6.1 .1 Markings. Markings shall be cast on the bonnet or body or provided on a corrosion-resistant tag afxed to each valve.
6.1 .1 .1 Requirements. Markings shall show the manufacturer’s name or
mark, the year the valve was made, the size of the valve, the letters “C509” and the
designation of working water pressure; for example, “200W.”
6.1 .1 .1 .1 Special markings in addition to these can be supplied when specifed by the purchaser’s requirements on agreement between purchaser and manufacturer.
6.2.1 Completeness. Valves shall be complete in detail when shipped.
6.2.1 .1 Draining. Valves shall be drained before shipment.
6.2.1 .2 Separate packaging. Handwheels and valve accessories may be
packed separately.
f
Te manufacturer shall, when required by the purchase documents, provide
the purchaser with an afdavit stating that the valve and materials used in its construction conform to the applicable requirements of this standard and the purchase
documents and that tests specifed in this standard have been performed and test
requirements have been met.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
Tis page intentionally blank.
Copyright © 201 6 American Water Works Association. All Rights Reserved.
APPENDIX A
Installation, Operation, and Maintenance of Resilient-Seated Gate Valves
Tis appendix is for information only and is not a part ofANSI/AWWA C509.
SECTION A.1 : GENERAL
Resilient-seated gate valves form a signifcant component part of many frefghting or water-distribution systems. Failure of a resilient-seated gate valve in
these systems, either as a result of faulty installation or improper maintenance,
could result in extensive damage and costly repairs. In addition, many resilientseated gate valves are installed in buried-service or underground applications.
Problems or malfunctions of the valves because of faulty installation or improper
maintenance can result in extensive and costly unearthing operations to efectively
correct or eliminate the problem. Many resilient-seated gate-valve problems and
failures can be traced back to improper handling, storage, installation, operation,
or maintenance procedures.
SECTION A.2: UNLOADING
Valves should be unloaded carefully. Each valve should be carefully lowered
from the truck to the ground; it should not be dropped. In the case of larger valves,
forklifts or slings around the body of the valve or under the skids should be used
for unloading. Only hoists and slings with adequate load capacity to handle the
weight of the valve or valves should be used. Hoists should not be hooked into or
chains fastened around yokes, gearing, motors, cylinders, or handwheels. Failure to
carefully follow these recommendations is likely to result in damage to the valve.
SECTION A.3: RECEIVING INSPECTION
Resilient-seated gate valves should be inspected at the time of receipt for
damage during shipment. Te initial inspection should verify compliance with
specifcations, direction of opening, size and shape of operating nut, number of
27
Copyright © 201 6 American Water Works Association. All Rights Reserved.
28
AWWA C5 09 -1 5
turns to open or close, and type of end connections. A visual inspection of the
seating surfaces should be performed to detect any damage during shipment or
scoring of the seating surfaces. Inspection personnel should look for bent stems,
broken handwheels, cracked parts, loose bolts, missing parts and accessories, and
any other evidence of mishandling during shipment. Each valve should be operated through one complete opening-and-closing cycle in the position in which it
is to be installed.
SECTION A.4: STORAGE
Valves should be stored indoors. If outside storage is required, the valves
should be protected from weather elements. During outside storage, they should
be protected from the weather, sunlight, ozone, and foreign materials. In colder
climates where valves may be subject to freezing temperatures, it is absolutely essential to prevent water from collecting in the valves. Failure to do so may result in a
cracked valve casting or deterioration of the resilient-seat material.
SECTION A.5: INSTALLATION
Instructions supplied by manufacturers should be reviewed in detail before
valves are installed. At the jobsite prior to installation, each valve should be visually inspected and any foreign material in the interior portion of the valve should
be removed. A detailed inspection of the valve as outlined in Sec. A.3 should be
performed prior to installation.
Sec. A.5.1
Bolts
Bolts should be checked for proper tightness and protected by the installer
to prevent corrosion, either with a suitable paint, bitumastic material, and/or by
polyethylene wrapping or other suitable means of corrosion protection.
Sec. A.5.2
Underground Installation
Valves in water-distribution lines shall, where practical, be located in easily
accessible areas.
A.5.2.1
During installation, there is the possibility of foreign materials in-
advertently entering the valve. Foreign material can damage internal working parts
during operation of the gate valve. For this reason, gate valves should be installed
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
29
in the closed position. Each valve should be placed on frm footing in the trench to
prevent settling and excessive strain on the connection to the pipe. Piping systems
should be supported and aligned to avoid damage to the valve.
A.5.2.2 A valve box or vault should be provided for each valve used in a
buried-service application. Te valve box should be installed so as not to transmit
loads or stress to the valve, valve stem, or piping system. Te valve box should be
centered over the operating nut of the valve with the box cover fush with the surface of the fnished area or another level as directed by the purchaser. Valve boxes
should be designed so that a trafc load on the top of the box is not transmitted to
the valve stem or piping system.
A.5.2.3 Valves buried in unusually deep trenches have special provisions
for operating the valve. Tese are either a riser on the stem to permit a normal key
to be used or a notation on valve records that a long key will be required.
A.5.2.4 When valves with exposed gearing or operating mechanisms are
installed belowground, a vault designed to allow pipe clearance and prevent settling on the pipe should be provided. Te operating nut should be accessible from
the top opening of the vault with a valve key. Te size of the vault should provide
for easy removal of the valve bonnet and internal parts of the valve for purposes
of repair. Consideration should be given to the possible entry of groundwater or
surface water and to the need to provide for the disposal thereof.
Sec. A.5.3
Aboveground Installation
Sec. A.5.4
Inspection
Sec. A.5.5
Testing
Valves installed aboveground or in a plant piping system should be supported
and aligned to avoid damage to the valve. Valves should not be used to correct
misalignment of piping.
After installation and before pressurization of the valve, pressure-containing bolting (bonnet, seal plate, packing gland, and end connections) should be
inspected for adequate tightness to prevent leakage. In addition, an inspection
should be made for adequate tightness of tapped and plugged openings to the valve
interior. Proper inspection at this time will minimize the possibility of leaks after
the piping system has been pressurized.
o prevent time lost searching for leaks, it is recommended that valve excavations not be backflled until pressure tests have been completed. After installation,
T
Copyright © 201 6 American Water Works Association. All Rights Reserved.
30
AWWA C5 09 -1 5
it is desirable to test newly installed piping sections, including valves, at some pressure above the system design pressure. Te test pressure should not exceed the rated
working pressure of the valve. After the test, steps should be taken to relieve any
trapped pressure in the body of the valve. Te resilient-seated gate valve should not
be operated in either the opening or closing directions at diferential pressures above
the rated working pressure. It should be noted that valves seat better at or near the
rated working pressure of the valve. In addition, wear or foreign material may damage valve seating surfaces and may cause leakage (see ANSI/AWWA C600).
Sec. A.5.6
Records
Sec. A.5.7
Application Hazards
Once the valve is installed, the valve location, size, make, type, date of installation, number of turns to open, direction of opening, and other information
deemed pertinent should be entered on permanent records.
Resilient-seated gate valves should not be installed in applications or for service other than those recommended by the manufacturer. Te following list of
precautions is not inclusive but will help avoid some applications hazards.
A.5.7.1 Resilient-seated gate valves should not be installed in lines where
service pressure will exceed the rated working pressure of the valve.
A.5.7.2 Resilient-seated gate valves should not be used for throttling service
unless the design is specifcally recommended for that purpose or accepted in advance by the manufacturer.
A.5.7.3 Resilient-seated gate valves should not be used in applications that
are exposed to freezing temperatures unless sufcient fow is maintained through
the valve or other protection is provided to prevent freezing.
A.5.7.4 Pipe, fttings, and valves installed in underground piping are generally joined with push-on or mechanical joints. Tese joints are considered unrestrained-type joints because no signifcant restraint against longitudinal separation
is provided.
Gate valves should not be installed at a dead end or near a bend in a pipeline
without proper and adequate restraint to support the valve and prevent it from
blowing of the end of the line. Rigid piping systems incorporating fanged valves
are not recommended for buried service.
Trust blocks, restrained joints, or other means of restraint are needed on
or adjacent to valves on pipelines; or where unusual conditions exist, such as high
internal pressures, adjacent fttings, or unsuitable soils; or as a means to anchor a
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
31
pressurized pipe section when an adjacent section is depressurized to be modifed
or repaired.
A.5.7.5 To prevent damage, 3-in. (75-mm) NPS and 4-in. (100-mm) NPS
resilient-seated gate valves should not be operated with input torques greater than
200 ft-lb (270 Nm). Gate valves 6-in. (150-mm) NPS to 16-in. (400-mm) NPS
should not be operated with input torques greater than 300 ft-lb (406 Nm). For
valves larger than 16 in. (400 mm), consult the manufacturer.
SECTION A.6: MAINTENANCE
Sec. A.6.1
Valve Exercising
Sec. A.6.2
Inspection
Each valve should be operated through a full cycle and returned to its normal
position on a time schedule that is designed to prevent a buildup of tuberculation
or other deposits that could render the valve inoperable or prevent a tight shutof.
Te interval of time between operations of valves in critical locations or valves subjected to severe operating conditions should be shorter than for other less important installations, but it can be whatever period is found to be satisfactory based
on local experience. Te number of turns required to complete the operation cycle
should be recorded and compared with permanent installation records to ensure
full gate travel.
When using portable auxiliary power actuators with input torque capacities exceeding the maximum operating torques recommended in Sec. A.5.7.5,
extreme care should be taken to avoid applying excessive torque to the valve
stem. If the actuator has a torque-limiting device, it should be set below the
values in Sec. A.5.7.5. If there is no torque-limiting device, the recommended
practice is to stop the power actuator three or four turns before the valve is fully
opened or fully closed and complete the operation manually.
Maintenance should be performed at the time a malfunction is discovered to
avoid a return trip to the same valve or to prevent neglecting it altogether. A recording system should be adopted that provides a written record of valve location, condition, maintenance, and each subsequent inspection of the valve.
Each valve should be operated through one complete operating cycle. If the
stem action is tight, the operation should be repeated several times until proper
Copyright © 201 6 American Water Works Association. All Rights Reserved.
32
AWWA C5 09 -1 5
operation is achieved. With the gate in the partially open position, a visual inspection should be performed, where practical, to check for leakage at joints, connections, and areas of packing or seals. If leakage is observed, defective O-rings, seals,
gaskets, or end-connection sealing members should be replaced. If the leakage
cannot be corrected immediately, the nature of the leakage should be reported
promptly to those who are responsible for repairs. If the valve is inoperable or
irreparable, its location should be clearly established to prevent loss of time for
repair crews. Te condition of the valve and, if possible, the gate position should
be reported to the personnel responsible for repairs. In addition, fre departments
and other appropriate municipal departments should be informed that the valve is
out of service.
Sec. A.6.3
Record Keeping
o carry out a meaningful inspection and maintenance program, it is essential that the location, make, type, size, and date of installation of each valve be
recorded. Depending on the type of record-keeping system used, other information may be entered in the permanent record. When a resilient-seated gate valve
is inspected, an entry should be made in the permanent record indicating date of
inspection and condition of the valve. If repair work is necessary, it should be indicated; and on completion of the work, the nature of the repairs and date completed
should be recorded.
T
SECTION A.7: REPAIRS
Leakage, broken parts, hard operation, and other major defects should be corrected by a repair crew as soon as possible after the defect is reported. If repairs are
to be performed in the feld, the repair crew should take a full complement of spare
parts to the jobsite. Provisions should be made to isolate the defective valve from
water pressure and relieve internal trapped pressure prior to performing any corrective maintenance. Disassembly of the valve should be accomplished in accordance
with the procedure supplied by the manufacturer.
After repair of the valve, the operating mechanism should be cycled through
one complete operating cycle. With full line pressure applied to the valve in the
open position, an inspection should be made to detect leakage in the areas around
the seal plate, bonnet, packing gland, and body-end connections. A record should
Copyright © 201 6 American Water Works Association. All Rights Reserved.
RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE
33
be made to indicate that the valve has been repaired and is in working condition. Any markings that the valve is inoperable should be deleted. In addition, f re
departments and other appropriate municipal departments should be informed of
the satisfactory repair of the valve.
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