Bulletin 71.8:6350
June 2009
6350 and 6360 Series Pilot Construction
DIAPHRAGM limiter
(used only with
two highest-range
control springs)
closing cap
gasket
W3709
mounting on type 63eg main valve
W3748-1*
restriction plug
detail of type 6358 pilot
W3837-1
W3838-1*
detail oF TYPE 6365c pilot
detail of TYPE 6365 pilot
Figure 1. Typical Pressure Relief or Backpressure Pilot Constructions
bellows
valve plug spring
balanced valve plug
bleed hole
removable
vent
unbalanced
valve plug
W3160-2*
mounting on type 1098
actuator and design
TYPE egr main valve
detail of
type 6351 pilot
Figure 2. Typical Pressure Reducing Pilot Constructions
www.emersonprocess.com/regulators
detail of type 6352,
6353, or 6354L pilot
D100178X012
W3149-1*
W3115-1
screw-in bleed
restriction
Bulletin 71.8:6350
Specifications
Available Configurations
See Table 1
Maximum Inlet Pressure(1)
See Table 2 or 3, but cannot exceed maximum inlet
pressure for complete regulator or relief valve, whichever is less
Outlet (Control) Pressure Ranges For Pressure
Reducing Pilots
See Table 2
Set Pressure Ranges For Relief or
Backpressure Pilots
See Table 3
Construction Materials
Body, Body Plug, and Spring Case
Type 6351 Pilot: Aluminum
Types 6352 through 6365C Pilots: Aluminum (standard), brass, or stainless steel
Closing Cap (Except Types 6351 and
6365C Pilots): Same material as spring case
Control Spring: Plated steel
Valve Plug Assembly
Type 6351 Pilot: Nitrile (NBR) seat with brass
stem (standard), Nitrile (NBR) seat with stainless
steel stem, Fluorocarbon (FKM) seat with brass stem,
or Fluorocarbon (FKM) seat with stainless steel stem
Type 6358 Pilot: Polyethylene with Nitrile (NBR) O-ring
All Other 6350 and 6360 Series Pilots: Nitrile (NBR)
seat with stainless steel stem
Other Metal Trim Parts: Steel, aluminum, nickel, and stainless steel
Diaphragm
Type 6351 Pilot: Nitrile (NBR) (standard) or
Fluorocarbon (FKM)
Type 6352 Pilot: Natural rubber
Types 6353, 6358, and 6365C Pilots: Nitrile (NBR) rubber
Types 6354L, 6354M, and 6354H Pilots: Neoprene
Type 6365 Pilot: See Table 3
Gaskets
Connector Cap Gasket: Fluorocarbon (FKM)
All Others: Asbestos
Filter (if used): Brass (Type P594-1 standard) or aluminum (Type P593-1), except cellulose for filter element and asbestos for gasket
Vents: Plastic
Material Temperature Capabilities(1)
Standard Elastomers: -20° to 150°F (-29° to 66°C)
High-Temperature Elastomers: 0° to 300°F
(-18° to 149°C), except 0° to 180°F (-18° to 82°C) for water service
Connections(2)
NPS 1/4 female
Approximate Weight
2 pounds (1 kg)
Additional Options
See Table 1
1. The pressure/temperature limits in this Bulletin, and any applicable standard or code limitations should not be exceeded.
2. Connections threaded to various national or international standards can usually be supplied. Contact your local Sales Office.
Introduction
Ordering Information
A 6350 or 6360 Series pilot (Figure 1 or 2) is typically
used with one of several different main valves in a
pressure reducing, pressure relief, or backpressure
application (see Table 1). All of these pilots can be
used in gas service, and all except the Type 6351 pilot
can be used in liquid service. All pilots described in
this bulletin have an easily-installed valve plug that
can be removed without removing the valve plug
stem guide.
Application
When ordering, specify:
2
1. Type of service—pressure reducing, pressure
relief or backpressure application; liquid or
gas service
2. Nature and specific gravity of controlled fluid
(including chemical analysis of possible)
3. Fluid temperature
4. Range of flowing inlet pressures and pressure drops
5. Desired set pressure
Bulletin 71.8:6350
Table 1. Available Configurations
type number
construction feature
Gas
Gas or Liquid
Pressure
Pressure
Reducing
Reducing
Application Application
6351
Unbalanced valve plug
Its set pressure is above main
valve outlet pressure
Pilot bleeds only when
X
Gas or Liquid
Backpressure
Application
6365
6352,
2
Lowest
3
Middle
2 Highest
6354M
6353,
6365C
6354H Control Control Control
6354L
Spring
Spring
Spring
Ranges Ranges Ranges
X
Balanced valve plug (specify when rapidly changing loads or
varying supply pressures are anticipated)
Gas or Liquid
Pressure Relief
Applications
X
X
X
X
Its set pressure is below main
valve inlet pressure
X
X
X
X
X
X
X
X
X
X
X
Main valve is stroking open
Adjustable control spring
X
X
X
X
Used singly on main valve
X
X
X
X
X
X
Reduces buildup required for main valve to go wide open when
used along with Type 6365 pilot at 20 psig (1,4 bar) and
higher set pressures
Fixed restriction and no letter code
on body
X
X
X
Field-changeable green-coded
restriction screw and S stamped
on body
X
X
Field-changeable yellow-coded
restriction screw and H stamped
on body
X
Field-changeable red-coded
restriction screw and S stamped
on body
X
X
X
Plugged restriction with bleed
through valve plug
X
Optional lower gain (field-changeable red-coded restriction
screw and S stamped on body)
Optional low gain for liquid
service and/or broader
proportional bands
Optional high gain for
narrower proportional bands
(such as with low-differential
boiler fuel service)
X
Field-changeable blue-coded
restriction screw and L stamped
on body
X
Threaded restriction without screw
and with L stamped on body
X
X
Field-changeable red-coded
restriction screw and H on body
X
X
Diaphragm limiter
P590 Series filter
X
Standard
X
X
X
X
X
Optional
Drilled no vent or closing cap
Standard spring case
X
X
X
X
X
X
X
X
X
1/4-inch (6,4 mm) tapped with
removable vent and gasketed
closing cap for remote venting or
for pressure loading applications
X
X
1/4-inch (6,4 mm) tapped without
vent or closing cap
Adjusting screw
Standard
Handwheel
Optional
Spring case for Type 661 Kixcel®
pilot drive unit mounting
Optional
Sour gas service constructions
X
X
X
Nonadjustable control spring
Standard gain
(will be provided unless
otherwise specified) 6358
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
3
Bulletin 71.8:6350
Table 2. Outlet (Control) Pressure Ranges for Pressure Reducing Pilots
maximum inlet
pressure(1)
Psig
bar
type number
6351
600
41,4
6352
600
41,4
6353
600
41,4
6354L
6354M
6354H
600
600
600
41,4
41,4
41,4
Without diaphragm
limiter
With diaphragm limiter
outlet (control)
pressure range
3 to 20 psig
5 to 35 psig
35 to 100 psig
14-inches w.c. to 2 psig
2 to 10 psig
3 to 40 psig
35 to 100 psig
85 to 200 psig
175 to 220 psig
200 to 300 psig
(0,21 to 1,4 bar)
(0,34 to 2,4 bar)
(2,4 to 6,9 bar)
(35 mbar to 0,14 bar)
(0,14 to 0,69 bar)
(0,21 to 2,8 bar)
(2,4 to 6,9 bar)
(5,9 to 13,8 bar)
(12,1 to 15,2 bar)
(13,8 to 20,7 bar)
pilot control spring
data
Color Code
Part Number
Green
1B986027212
Cadmium
1B788327022
Red
1K748527202
Yellow
14A9672X012
Black
14A9673X012
Yellow
1E392527022
Red
1K748527202
Blue
1L346127142
Blue
1L346127142
Green
15A9258X012
1. Maximum inlet pressure for complete regulator, if less than this value, cannot be exceeded.
Table 3. Set Pressure Ranges for Relief or Backpressure Pilots
type number
6358
6365(2)
Without diaphragm
limiter
With diaphragm limiter
maximum inlet pressure
(including buildup)(1)
Psig
bar
150
10,3
50
3,45
150
10,3
360
24,8
360
24,8
set pressure range
Psig
3 to 40
3 to 125
0.5 to 2
2 to 10
3 to 40
35 to 125
85 to 200
175 to 220
200 to 300
bar
0,21 to 2,8
0,21 to 8,6
0,03 to 0,14
0,14 to 0,69
0,21 to 2,8
2,4 to 8,6
5,9 to 13,8
12,1 to 15,2
13,8 to 20,7
pilot control
spring data
Color Code
Part Number
Yellow
1E392527022
Red
1K748527202
Yellow
14A9672X012
Black
14A9673X012
Yellow
1E392527022
Red
1K748527022
Blue
1L346127142
Blue
1L346127142
Green
15A9258X012
diaphragm
material
Nitrile (NBR)
rubber
Natural rubber
Nitrile (NBR)
rubber
Neoprene
Neoprene
1. Maximum inlet pressure for complete relief valve, if less than this value, cannot be exceeded.
2. Addition of Type 6365C cascade pilot does not affect set pressure range.
Construction
Refer to the Specifications section on page 2. Review
the description to the right of each specification and
in the referenced tables; specify the desired selection
wherever there is a choice to be made.
Always specify the type number of other desired
equipment as well as the pilot. The standard-gain
pilot restriction will be provided automatically unless
an optional-gain restriction is ordered.
Industrial Regulators
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Regulator Technologies, Inc.
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Regulator Technologies, Inc.
Emerson Process Management
Tescom Corporation
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McKinney, Texas 75069-1872 USA
Tel: 1-800-558-5853
Outside U.S. 1-972-548-3574
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Tel: +65 6777 8211
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Tel: +971 4811 8100
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Tel: +49 (0) 38823 31 0
For further information visit www.emersonprocess.com/regulators
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