Stainless-Steel or StainlessSteel-Lined, Bonnetless, Knife
Gate Valves with Flanged Ends
Standard Practice
Developed and Approved by the
Manufacturers Standardization Society of the
Valve and Fittings Industry, Inc.
127 Park Street, NE
Vienna, Virginia 22180-4602
Phone: (703) 281-6613
Fax: (703) 281-6671
E-mail: standards@mss-hq.org
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MSS SP-81-2013
MSS
STANDARD PRACTICE
SP-81
This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 114 and the MSS
Coordinating Committee. Maintenance of this Standard Practice is now the responsibility of MSS Technical Committee
409, as of the date of this publication. The content of this Standard Practice is the resulting efforts of competent and
experienced volunteers to provide an effective, clear, and non-exclusive standard that will benefit the industry as a
whole. This MSS Standard Practice describes minimal requirements and is intended as a basis for common practice by
the manufacturer, the user, and the general public. The existence of an MSS Standard Practice does not in itself preclude
the manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory conformance to this
Standard Practice is established only by reference in other documents such as a code, specification, sales contract, or
public law, as applicable. MSS has no power, nor does it undertake, to enforce or certify compliance with this
document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not
be attributable to MSS and is solely the responsibility of the certifier or maker of the statement.
“Unless indicated otherwise within this MSS Standard Practice, other standards documents referenced to
herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of
this MSS Standard Practice (see Annex A). This Standard Practice shall remain silent on the validity of those
other standards of prior or subsequent dates of issue even though applicable provisions may not have changed.”
By publication of this Standard Practice, no position is taken with respect to the validity of any potential claim(s) or
of any patent rights in connection therewith. MSS shall not be held responsible for identifying any patent rights.
Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely
their responsibility.
In this Standard Practice, all text, notes, annexes, tables, figures, and references are construed to be essential to the
understanding of the message of the standard, and are considered normative unless indicated as “supplemental”. All
appendices, if included, that appear in this document are construed as “supplemental”. Note that supplemental
information does not include mandatory requirements.
The SI (metric) units and U.S. customary units in this Standard Practice are regarded separately as the standard; each
should be used independently of the other. Combining or converting values between the two systems may result in
non-conformance with this Standard Practice.
This Standard Practice has been substantially revised from the previous 2006a edition. It is
suggested that if the user is interested in knowing what changes have been made, that direct
page by page comparison should be made of this document and that of the previous edition.
Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified.
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Excerpts of this Standard Practice may be quoted with permission. Credit lines should read ‘Extracted from
MSS SP-81-2013 with permission of the publisher, Manufacturers Standardization Society of the Valve and
Fittings Industry.'. Reproduction and/or electronic transmission or dissemination is prohibited under
copyright convention unless written permission is granted by the Manufacturers Standardization Society of
the Valve and Fittings Industry Inc. All rights reserved.
Originally Published: August 1975
Current 2013 Edition Approved: October 2012 (Updated March 2013)
Current 2013 Edition Published: May 2013
MSS is a registered trademark of the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
Copyright ©, 2013 by
Manufacturers Standardization Society
of the
Valve and Fittings Industry, Inc.
Printed in U.S.A.
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MSS
STANDARD PRACTICE
SP-81
TABLE OF CONTENTS
SECTION
1
2
3
4
5
6
7
8
9
10
11
PAGE
SCOPE AND FIELD OF APPLICATION .......................................................................................... 1
STANDARD UNITS ........................................................................................................................... 1
PRESSURE RATING ......................................................................................................................... 1
SIZE ..................................................................................................................................................... 1
MARKING .......................................................................................................................................... 1
MATERIALS ...................................................................................................................................... 2
DESIGN ............................................................................................................................................... 2
WELDING ........................................................................................................................................... 2
TOLERANCES ................................................................................................................................... 2
PRODUCTION TEST ......................................................................................................................... 2
SHIPPING INFORMATION .............................................................................................................. 3
TABLE
1
2
3
4
Valve Dimensions, Inches ................................................................................................................... 4
Valve Dimensions, Millimeters ........................................................................................................... 4
Materials .............................................................................................................................................. 5
Equivalent Stainless Steel Grades ........................................................................................................ 5
ANNEX
A
Referenced Standards and Applicable Dates ....................................................................................... 6
ii
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MSS
STANDARD PRACTICE
SP-81
STAINLESS-STEEL OR STAINLESS-STEEL-LINED, BONNETLESS,
KNIFE GATE VALVES WITH FLANGED ENDS
1. SCOPE AND FIELD OF APPLICATION
5. MARKING
1.1 This Standard Practice covers all
stainless-steel or stainless-steel-lined, cast, or
fabricated bonnetless, knife gate valves with
flanged ends from size NPS 2 (DN 50)
through NPS 36 (DN 900).
The valve shall be marked in accordance with
MSS SP-25, including the following
requirements and modifications:
a) Manufacturer’s name or trademark/logo.
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1.2 The valves identified in this Standard
Practice are intended for use in applications
where shock loadings are not encountered.
Applications at conditions other than those
specified in Section 3 require special design
considerations.
b) The body material of construction or
code, when more than one material or
grade of material is used, shall each be
identified. The material in contact with
the fluid media shall be listed and
identified as “lining” on the name plate.
It is not required to repeat the material
designation of fabricated bodies.
2. STANDARD UNITS
The values stated in either U.S. customary
units or SI (metric) units are to be regarded
separately as the “standard”. Within the text,
the SI (metric) units are shown in parenthesis.
The values stated in each system are not exact
equivalents; therefore, each system must be
used independently of the other. Combining
values from the two systems may result in
non-conformance with this Standard Practice.
c) Since most valves are manufactured for
closure in one direction only, the valve
shall be marked showing the “seat side”
(downstream side) of the valve in such a
manner that the markings can be seen
with the valve installed in the pipeline.
The user shall be responsible for correct
directional installation. When bidirectional performance is required,
testing in the reverse direction from the
seat shall be as per agreement between
the customer and the manufacturer.
Markings shall still indicate the seat side
of the valve. Bi-directional designs do
not require a flow direction indicator.
3. PRESSURE RATING
This Standard Practice covers valves with a
gauge pressure rating not exceeding the
values in the following table, at temperatures
between 32 °F and 150 °F (0 °C and 66 °C).
U.S. Customary
NPS
psi
2 – 24
150
SI (Metric)
DN
bar
50 – 600
10.3
30, 36
750, 900
100
d) The valve shall be marked for
installation purposes, indicating:
1) Care to be taken in valve
installation with respect to direction
of closure.
2) Care to be taken when installing studs
or bolts in the tapped holes of the
flange in the area of the chest to
prevent chest damage. The “chest” is
the body area between the packing
chamber and the flanges.
3) Packing
nuts
may
require
adjustment to obtain a tight seal.
6.9
4. SIZE
The valve sizes in Table 1 (NPS) and Table 2
(DN) are the nominal sizes of the end
connections.
e) The stem material need not be listed.
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MSS
STANDARD PRACTICE
6. MATERIALS
SP-81
7.4 The valve port I.D. shall not be less than
90 percent (90%) of the nominal inside
diameter of Schedule 40 pipe.
6.1 Materials used for major components of
these valves are listed in Table 3. Equivalent
stainless steel grades are listed in Table 4.
7.5 Because of variations in basic valve
design, differential pressure, and valve
accessibility, it is not possible to standardize
the conditions under which a manually
operated valve requires mechanical assistance.
6.2 Materials for stainless-steel-lined knife
gate valves, per Tables 3 and 4 of this
Standard Practice, shall be by agreement
between purchaser and manufacturer.
Consideration should be given to the use of
mechanical assistance on all valves over NPS 8
(DN 200) when the differential pressure, during
valve operation, approaches the valve’s rated
working pressure. In addition, consideration
should be given to the use of mechanical
assistance on all NPS 16 (DN 400) valves and
larger, regardless of differential pressure.
7. DESIGN
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7.1 Valves shall be all stainless steel or
stainless-steel-lined, by agreement as per
Section 6.2. All interior wetted surfaces,
including raised faces, gasket and packing
chamber surfaces shall be stainless steel.
Liners shall be sealed to insure internal
leakage cannot penetrate to the outer shell.
With the exception of hard facing overlays and
coatings, all internal wetted parts shall have a
corrosion resistance at least equivalent to the
trim items (stem, gate, or seat rings) or valve
liner; whichever is considered to have the
lesser corrosion resistance. Hard face overlays
(Cobalt or Ni-Cr types) on valve seating
surfaces or wear surfaces are acceptable.
Coatings applied to internal wetted surfaces
shall be by agreement between the
manufacturer and user.
8. WELDING
All body pressure boundary welds shall be in
accordance with the ASME Boiler and
Pressure Vessel Code, Section IX.
9. TOLERANCES
The following tolerances shall be followed:
Face-to-face:
NPS 10 (DN 250) and smaller
+0.06 in. (+1.6 mm)
Dimensions shall be in accordance with Table
1 (inches) or Table 2 (millimeters).
NPS 12 (DN 300) and larger
+0.12 in. (+3.2 mm)
7.2 The design of all valves shall prevent
permanent distortion of the body or seats when
tested as specified in Section 10. Some
permanent distortion of stainless-steel parts is
acceptable during the shell test of Section 10.1
provided it can be demonstrated that there will
be no further deformation upon subsequent
pressure loadings.
Flange outside diameter:
+0.06 in. (+1.6 mm)
Bolt circle diameter drilling:
+0.06 in. (+1.6 mm)
Center-to-center of adjacent bolt holes:
+0.03 in. (+0.8 mm)
7.3 When through-bolting is specified,
valves shall have flange holes per ASME B16.5
for sizes NPS 2 (DN 50) through NPS 24 (DN
600) for Class 150, and per ASME B16.47
Series A for sizes larger than NPS 24 (DN
600), see Table 1 (NPS) and Table 2 (DN);
except holes that contact the chest shall be
tapped in accordance with Table 1 or Table 2.
10. PRODUCTION TEST
10.1 Shell Test (Body) Each valve shall be
hydrostatically pressure tested at 1.5 times the
rated working pressure with no visible leakage
allowed (leakage through the packing or gate
seal shall not be cause for rejection).
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MSS
STANDARD PRACTICE
The test fluid shall be water (which may
contain a corrosion inhibitor), kerosene, or
another suitable fluid provided such fluid has
a viscosity that is not greater than that of
water. The test fluid temperature shall not
exceed 125 °F (50 °C).
10.2 Seat Test After the shell test, each valve
shall be hydrostatically pressure tested at 40
psi (2.8 bar) differential pressure in the
direction of closure. Maximum permissible
leakage shall be 40 ml/min/NPS (1.6
ml/min/DN). Seat test duration shall be in
accordance with MSS SP-61.
11. SHIPPING INFORMATION
11.1 Valve packing nuts may be loosened
prior to shipment to extend packing life. These
nuts may have to be adjusted after installation.
11.2 Unless indicated otherwise, valves shall
be shipped with covers to protect the raised
face of the flanges.
3
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SP-81
MSS
STANDARD PRACTICE
SP-81
TABLE 1 Valve Dimensions, Inches
Flanges
Valve
Size
(NPS)
Bolting
Tap
Size
Clearance
Hole
Diameter(a)
Thickness
Minimum
(Includes 0.06"
Raised Face)
4
4
8
5/8 – 11
5/8 – 11
5/8 – 11
0.75
0.75
0.75
0.50
0.50
0.50
1.88
2.00
2.00
8.50
9.50
11.75
8
8
8
3/4 – 10
3/4 – 10
3/4 – 10
0.88
0.88
0.88
0.63
0.63
0.63
2.25
2.25
2.75
12.75
15.00
16.25
14.25
17.00
18.75
12
12
12
7/8 – 9
7/8 – 9
1–8
1.00
1.00
1.12
0.75
0.75
0.81
2.75
3.00
3.00
23.50
25.00
27.50
18.50
21.00
23.00
21.25
22.75
25.00
16
16
20
1–8
11⁄8 – 7
11⁄8 – 7
1.12
1.25
1.25
0.88
0.94
1.00
3.50
3.50
4.50
32.00
38.75
46.00
27.25
33.75
40.25
29.50
36.00
42.75
20
28
32
1¼ – 7
1¼ – 7
1½ – 6
1.38
1.38
1.62
1.00
1.12
1.12
4.50
4.62
4.62
Outside
Diameter(a)
Raised Face
Outside
Diameter(a)
Bolt Circle
Diameter(a)
2
3
4
6.00
7.50
9.00
3.62
5.00
6.19
4.75
6.00
7.50
5
6
8
10.00
11.00
13.50
7.31
8.50
10.62
10
12
14
16.00
19.00
21.00
16
18
20
24
30
36
Quantity
(a)
(b)
Face-to-Face
NOTES:
(a) In conformance with ASME B16.5, Class 150 for sizes NPS 2 through 24 and per ASME B16.47 Series A for sizes > NPS 24.
(b) Eight-thread series (8-UN) may be used for bolting greater than one inch, as recommended by ASME B16.5 and ASME B16.47 for steel flanges.
TABLE 2 Valves Dimensions, Millimeters
Valve
Size
(DN)
Outside
Diameter(a)
Raised Face
Outside
Diameter(a)
Bolt Circle
Diameter(a)
50
80
100
150.0
190.0
230.0
92.0
127.0
157.5
120.5
152.5
190.5
125
150
200
255.0
280.0
345.0
186.0
216.0
270.0
250
300
350
405.0
485.0
535.0
400
450
500
600
750
900
Bolting
Tap
Size(b)(c)
Clearance
Hole
Diameter(a)
Thickness
Minimum
(Includes 1.5 mm
Raised Face)
4
4
8
5/8 – 11
5/8 – 11
5/8 – 11
18.0
18.0
18.0
12.7
12.7
12.7
48.0
51.0
51.0
216.0
241.5
298.5
8
8
8
3/4 – 10
3/4 – 10
3/4 – 10
22.0
22.0
22.0
16.0
16.0
16.0
57.0
57.0
70.0
324.0
381.0
413.0
362.0
432.0
476.0
12
12
12
7/8 – 9
7/8 – 9
1–8
26.0
26.0
28.4
19.1
19.1
20.6
70.0
76.0
76.0
600.0
635.0
700.0
470.0
533.5
584.5
540.0
578.0
635.0
16
16
20
1–8
11⁄8 – 7
11⁄8 – 7
28.4
32.5
32.5
22.4
23.9
25.4
89.0
89.0
114.0
815.0
985.0
1170.0
692.5
857.0
1022.0
749.5
914.0
1086.0
20
28
32
1¼ – 7
1¼ – 7
1½ – 6
35.5
35.5
42.0
25.4
28.4
28.4
114.0
117.0
117.0
Quantity
(a)
Face-to-Face
NOTES:
(a) In conformance with ASME B16.5, Class 150 for sizes DN 50 through 600 and per ASME B16.47 Series A for sizes > DN 600.
(b) U.S. customary units apply, per ASME B16.5 and B16.47 bolting requirements.
(c) Eight-thread series (8-UN) may be used for bolting greater than one inch, as recommended by ASME B16.5 and ASME B16.47 for steel flanges.
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Flanges
MSS
STANDARD PRACTICE
SP-81
MATERIAL
ASTM NUMBER
Stainless-Steel Plate
A240/A240M
Stainless-Steel Bar
A276
Stainless-Steel Casting
A743/A743M or A351/A351M
Carbon-Steel Plate
A283/A283M, A36/A36M, or A285/A285M
Carbon-Steel Casting
A216/A216M
Bronze Casting
B62
Iron Casting
A126, Class B
TABLE 4
Equivalent Stainless Steel Grades
WROUGHT
CAST
304
CF-8
316
CF-8M
317
CG-8M
304L
CF-3
316L
CF-3M
317L
CG-3M
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TABLE 3
Materials
MSS
STANDARD PRACTICE
SP-81
ANNEX A
Referenced Standards and Applicable Dates
This Annex is an integral part of this Standard Practice and is placed after the main text for convenience.
Standard Name
Description
ASME; ANSI/ASME
B16.5-2009
B16.47-2011
BPVC-IX-2013
Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard
Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications
ASTM
A36/A36M-12
A126-04(2009)
A216/A216M-12
Standard Specification for:
Carbon Structural Steel
Gray Iron Castings for Valves, Flanges, and Pipe Fittings
Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature
Service
Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for
Pressure Vessels and for General Applications
Stainless Steel Bars and Shapes
Low and Intermediate Tensile Strength Carbon Steel Plates
Pressure Vessel Plates, Carbon Steel, Low- and Intermediate-Tensile Strength
Castings, Austenitic, for Pressure-Containing Parts
Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for
General Application
Composition Bronze or Ounce Metal Castings
A240/A240M-12a
A276-10
A283/A283M-12
A285/A285M-12
A351/A351M-12b
A743/A743M-12
B62-09
MSS
SP-25-2008
SP-61-2013
Standard Marking System for Valves, Fittings, Flanges, and Unions
Pressure Testing of Valves
The following organizations appear in the above list:
American National Standards Institute, Inc.
25 West 43rd Street, Fourth Floor
New York, NY 10036-7406
ASME
American Society of Mechanical Engineers (ASME International)
Two Park Avenue
New York, NY 10016-5990
ASTM
ASTM International
100 Barr Harbor Drive, P.O. Box C700
West Conshohoken, PA 19428-2959
MSS
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
127 Park Street, NE
Vienna, VA 22180-4602
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ANSI
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TITLE
SP-6-2012
SP-9-2013
SP-25-2008
SP-42-2013
SP-43-2013
SP-44-2010
SP-45-2003
SP-51-2012
SP-53-2012
SP-54-2013
SP-55-2011
SP-58-2009
SP-60-2012
SP-61-2013
SP-65-2012
SP-67-2011
SP-68-2011
SP-69-2003
SP-70-2011
SP-71-2011
SP-72-2010a
SP-75-2008
SP-78-2011
SP-79-2011
SP-80-2013
SP-81-2013
SP-83-2006
SP-85-2011
SP-86-2009
SP-87-1991
SP-88-2010
SP-91-2009
SP-92-2012
SP-93-2008
SP-94-2008
SP-95-2006
SP-96-2011
SP-97-2012
SP-98-2012
SP-99-2010
SP-100-2009
SP-101-1989
SP-102-1989
SP-104-2012
SP-105-2010
SP-106-2012
SP-108-2012
SP-109-2012
SP-110-2010
SP-111-2012
SP-112-2010
SP-113-2012
SP-114-2007
SP-115-2010
SP-116-2011
SP-117-2011
SP-119-2010
SP-120-2011
SP-121-2006
SP-122-2012
SP-123-2013
SP-124-2012
SP-125-2010
SP-126-2013
SP-127-2001
SP-128-2012
SP-129-2003
SP-130-2013
SP-131-2010
SP-132-2010
SP-133-2010
SP-134-2012
SP-135-2010
SP-136-2007
SP-137-2013
SP-138-2009
SP-139-2010
SP-140-2012
SP-141-2012
SP-142-2012
SP-143-2012
SP-144-2013
SP-145-2013
Listing of MSS Standard Practices (as of May, 2013)
Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
Spot Facing for Bronze, Iron, and Steel Flanges
Standard Marking System for Valves, Fittings, Flanges, and Unions
Corrosion-Resistant Gate, Globe, Angle, and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600)
Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications
Steel Pipeline Flanges (incl. 2011 Errata Sheet)
(R 2008) Bypass and Drain Connections
Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components – Magnetic Particle Examination Method
Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components – Radiographic Examination Method
Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Visual Method for Evaluation of
Surface Irregularities (ANSI-approved American National Standard)
Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation (incorporates content of SP-69, 77, 89, and 90)
(ANSI-approved American National Standard)
Connecting Flange Joints between Tapping Sleeves and Tapping Valves
Pressure Testing of Valves
High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
Butterfly Valves
High Pressure Butterfly Valves with Offset Design
Pipe Hangers and Supports – Selection and Application (ANSI-approved American National Standard)
Gray Iron Gate Valves, Flanged and Threaded Ends
Gray Iron Swing Check Valves, Flanged and Threaded Ends (incl. 2013 Errata Sheet)
Ball Valves with Flanged or Butt-Welding Ends for General Service
Specification for High-Test, Wrought, Butt-Welding Fittings
Gray Iron Plug Valves, Flanged and Threaded Ends
Socket Welding Reducer Inserts
Bronze Gate, Globe, Angle, and Check Valves
Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends
Class 3000 Steel Pipe Unions Socket Welding and Threaded
Gray Iron Globe & Angle Valves, Flanged and Threaded Ends
Guidelines for Metric Data in Standards for Valves, Flanges, Fittings, and Actuators (Incl. 2011 Errata Sheet)
(R 1996 – Reinstated 2011) Factory-Made Butt-Welding Fittings for Class I Nuclear Piping Applications
Diaphragm Valves
Guidelines for Manual Operation of Valves
MSS Valve User Guide
Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components – Liquid Penetrant Examination Method
Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Ultrasonic Examination Method
Swage(d) Nipples and Bull Plugs
Guidelines on Terminology for Valves and Fittings
Integrally Reinforced Forged Branch Outlet Fittings – Socket Welding, Threaded, and Buttwelding Ends
Protective Coatings for the Interior of Valves, Hydrants, and Fittings
Instrument Valves
Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves
(R 2001) Part-Turn Valve Actuator Attachment – Flange and Driving Component Dimensions and Performance Characteristics
(R 2001) Multi-Turn Valve Actuator Attachment – Flange and Driving Component Dimensions and Performance Characteristics
Wrought Copper Solder-Joint Pressure Fittings
Instrument Valves for Code Applications
Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150, and 300
Resilient-Seated Cast Iron Eccentric Plug Valves
Weld-Fabricated Copper Solder-Joint Pressure Fittings (incl. 2012 Errata Sheet)
Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends (incl. 2010 Errata Sheet)
Gray-Iron and Ductile-Iron Tapping Sleeves
Quality Standard for Evaluation of Cast Surface Finishes – Visual and Tactile Method. This SP must be used with a 10-surface, three dimensional Cast
Surface Comparator, which is a necessary part of the standard. Additional Comparators available separately.
Connecting Joints between Tapping Machines and Tapping Valves
Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000 (ANSI-approved American National Standard)
Excess Flow Valves, 1¼ NPS and Smaller, for Fuel Gas Service
Service-Line Valves and Fittings for Drinking Water Systems
Bellows Seals for Globe and Gate Valves
Factory-Made Wrought Belled End Pipe Fittings for Socket-Welding
Flexible Graphite Packing System for Rising Stem Valves – Design Requirements
Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves
Plastic Industrial Ball Valves
Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube
Fabricated Tapping Sleeves
Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves
In-Line, Spring-Assisted, Center-Guided Check Valves (Carbon, Alloy Steel, Stainless Steel, & Nickel Alloys)
Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application
Ductile Iron Gate Valves
(R 2007) Copper-Nickel Socket-Welding Fittings and Unions
Bellows Seals for Instrument Valves
Metallic Manually Operated Gas Distribution Valves
Compression Packing Systems for Instrument Valves
Excess Flow Valves for Low Pressure Fuel Gas Appliances
Valves for Cryogenic Service, including Requirements for Body/Bonnet Extensions
High Pressure Knife Gate Valves
Ductile Iron Swing Check Valves
Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components
Quality Standard Practice for Oxygen Cleaning of Valves & Fittings
Copper Alloy Gate, Globe, Angle, and Check Valves for Low Pressure/Low Temperature Plumbing Applications
Quality Standard Practice for Preparation of Valves and Fittings for Silicone-Free Service
Multi-Turn and Check Valve Modifications
Excess Flow Valves for Fuel Gas Service, NPS 1½ through 12
Live-Loaded Valve Stem Packing Systems
Pressure Seal Bonnet Valves
Metal Ball Valves for Low Pressure/Low Temperature Plumbing Applications
(R YEAR) Indicates year reaffirmed • Price List Available Upon Request • MSS is an ANSI-accredited American National Standards developer
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
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Copyright Manufacturers Standardization Society of the Valve and Fittings Indust
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