Instruction Manual
D103153X012
6350 Series
July 2019
6350 Series Pilots for Pilot-Operated Pressure
Reducing Regulators
BELLOWS
VALVE PLUG SPRING
BLEED HOLE
BALANCED VALVE PLUG
REMOVABLE
VENT
SCREW-IN BLEED
RESTRICTION
UNBALANCED
VALVE PLUG
W3160-2*
W3149-1*
DETAIL OF TYPE 6352,
6353, OR 6354L PILOT
DETAIL OF
TYPE 6351 PILOT
W6956
TYPE 6350 SERIES ON A
TYPE 1098-EGR REGULATOR
Figure 1. 6350 Series Pressure Reducing Pilot Constructions
Introduction
Product Description
The 6350 Series pilots have been designed to
ensure maximum pressure control accuracy and
fast response in a wide variety of applications:
natural gas distribution systems; fuel gas supply to
industrial boilers, furnaces, ovens, and mixers; and
large commercial/industrial establishments such as
shopping centers and schools. They can also be used
in plant air and in liquid service.
Scope of the Manual
This manual provides installation, startup,
maintenance, and parts ordering information for
the 6350 Series pilots used together with Pilot-
Operated Pressure Reducing Regulators in low
pressure applications.
For information on mounting on Pilot-operated
Regulators, refer to full product literature:
Type 1098-EGR: D100339X012
Type EZL: D103091X012
6350 Series
4. Pressure setting of pilot control spring: Turning
the adjusting screw clockwise into the spring
case increases the spring compression
and pressure setting. Turning the adjusting
screw counterclockwise decreases the spring
compression and pressure setting.
Installation and Startup
1. Use qualified personnel when installing, operating
and maintaining pilots. Before installing, inspect
pilot and tubing, for any shipment damage or
foreign material that may have collected during
crating and shipment. Make certain that body is
clean and the pipelines are free of foreign material.
Pilot Adjustment
To adjust standard 6350 Series pilots: loosen the
locknut and turn the adjusting screw. Then tighten
the locknut to maintain the adjustment position. A
closing cap must be removed before adjustment and
replaced afterward.
!
WARNING
In hazardous or flammable gas service,
vented gas may accumulate, and cause
personal injury, death, or property
damage due to fire or explosion.
!
WARNING
Vent a regulator in hazardous gas
service to a remote, safe location away
from air intakes or any hazardous
location. The vent line or stack opening
must be protected against condensation
or clogging.
To avoid possible personal injury from
a pressure-loaded pilot, carefully vent
the spring case before removing the
closing cap. Otherwise, trapped loading
pressure could forcefully eject the freed
closing cap.
2. To keep the pilot spring case vent from being
plugged or the spring case from collecting moisture,
corrosive chemicals, or other foreign material, point
the vent down or otherwise protect it. To remotely
vent the standard pilot, remove the vent and install
obstruction-free tubing or piping into the 1/4 NPT
vent tapping. Provide protection on a remote vent
by installing a screened vent cap into the remote
end of the vent pipe.
Maintenance
Pilot parts are subject to normal wear and must be
inspected and replaced as necessary. The frequency
of inspection and replacement of parts depends upon
the severity of service conditions or the requirements
of local, state, and federal regulations. Due to the
care Fisher™ takes in meeting all manufacturing
requirements (heat treating, dimensional tolerances,
etc.), use only replacement parts manufactured or
furnished by Fisher.
3. Run a 3/8 in. / 9.5 mm outer diameter or larger
pilot supply line from the upstream pipeline to
the filter inlet. Do not make the upstream pipeline
connection in a turbulent area, such as near a
nipple, swage, or elbow. If the maximum pilot inlet
pressure could exceed the pilot rating, install a
separate reducing regulator in the pilot supply line.
Install a hand valve in the pilot supply line, and
provide vent valves to properly isolate and relieve
the pressure from the regulator.
All O-rings, gaskets, and seals should be lubricated
with a good grade of general purpose grease and
installed gently rather than forced into position. Be
certain that the nameplates are updated to accurately
indicate any field changes in equipment, materials,
service conditions, or pressure settings.
!
WARNING
CAUTION
To avoid personal injury resulting
from sudden release of pressure,
isolate the regulator from all pressure
and cautiously release trapped
pressure from the regulator before
attempting disassembly.
Introduce pilot supply pressure into
the regulator before introducing any
downstream pressure, or internal damage
may occur due to reverse pressurization
of the pilot and main valve components.
3
6350 Series
Note
Type 6351 Pilot
The body (key 1) may remain on the
pipe nipple (key 21, Figure 3) unless the
entire pilot is replaced.
Perform this procedure if changing the control spring
for one of a different range, or if inspecting, cleaning,
or replacing any other pilot parts. Pilot key numbers
are referenced in Figure 2.
1. To gain access to the diaphragm assembly (key 5),
diaphragm limiter (key 23) if used, control spring
(key 6), restriction (key 22), stem guide (key 8),
or spring seat (key 7), remove the closing cap
(key 11), loosen the locknut (key 10), and turn
the adjusting screw (key 9) counterclockwise until
compression is removed from the spring. Remove
the machine screws (key 14), and separate the
body from the spring case (key 2).
Note
The body assembly (key 1) may remain
on the pipe nipple (key 22, Figure 2)
unless the entire pilot is replaced.
1. To gain access to the diaphragm assembly (key 7),
control spring (key 9), or spring seat (key 8),
loosen the locknut (key 11, and turn the adjusting
screw (key 10) out until compression is removed
from the spring. Remove the machine screws
(key 12), and separate the body assembly from the
spring case.
2. Inspect the removed parts, and replace as
necessary. Make sure the restriction and the
registration hole in the body are free from debris.
After assembly, make sure of the proper control
spring setting according to the Startup section, and
remark the spring case if necessary.
2. Inspect the removed parts and replace as
necessary. Ensure the registration and bleed
holes in the pilot body are free of debris. After
assembly, make sure of the proper control spring
setting according to the Startup section and
remark the spring case if necessary.
3. To replace the valve plug (key 4) or bellows O-ring
(key 17), remove the body plug (key 3) and body
plug gasket (key 12). Be careful to keep the bellows
assembly (key 16) from falling out and possibly
getting lost while removing the valve plug. Inspect
the removed parts, and replace as necessary.
Make sure the valve plug seating surfaces are free
from debris.
3. To replace the valve plug (key 4), remove the
body plug (key 3) to let the valve spring (key 6)
and inner valve assembly (key 4) drop freely
from the body (key 1). Inspect the removed parts,
replace if necessary. Make sure the plug seating
surfaces are free from debris. Inspect body plug
O-ring, replace if necessary. Type 6351 pilots
manufactured before May 1999 need to have the
body plug gasket and the body plug replaced with
a new body plug assembly (key 3), which includes
the body plug and the body plug O-ring. Install the
body plug O-ring over the body plug. Stack the
valve spring (key 6) and the inner valve assembly
(key 4) on the body plug assembly (key 3), and
install the body plug assembly with stacked parts
into the body (key 1).
Parts Ordering
Each 6350 Series pilot is assigned a serial number or
FS number which can be found on the nameplates.
Refer to this number when contacting your local
Sales Office for assistance, or when ordering
replacement parts.
When ordering a replacement part, be sure to
include the complete 11-character part number
from the following parts list. Some commonly used
trim packages can be ordered according to the
11-character assembly number given in the parts kits
listed in the Parts List.
Types 6352 through 6354M Pilots
Perform this procedure if changing the control spring
for one of a different range, or if inspecting, cleaning,
or replacing any other pilot parts. Pilot part key
numbers are referenced in Figure 3.
4
6350 Series
Parts List
Type 6351 Pilot (Figure 2)
Key Description
Part Number
Key Description
Part Number
22
Pipe Nipple,
Standard and Corrosive service,
Galvanized plated steel (use with P590 Series)
Steel (NACE)
Filter
P590 Series (standard)
P590 Series for NACE service
Closing Cap
Aluminum bonnet (plastic cap)
Vent Assembly
Relief Valve Assembly
Aluminum/302 Stainless steel (NACE)
Aluminum/Stainless steel
(Types S301D and S301F)
All other assemblies
Parts Kit (includes keys 3, 4, 6, 7 and
for the P590 Series filter, keys 2 and 7)
R6351X00012
1C488226232
1C4882X0032
1
Body Assembly
Aluminum with brass bushing
Aluminum with Stainless steel bushing (NACE)
Stainless steel with Stainless steel bushing
1B7971X0092
1B7971X0342
1B7971X0122
24
28
Type P514-1
Type P513-1
2
3
Bonnet
Aluminum with closing cap
25A6220X012
23B9152X012
Type Y602-12
Body Plug Assembly (includes body plug
and O-ring)
Aluminum body plug
with Nitrile (NBR) O-ring
with Fluorocarbon (FKM) O-ring
Stainless steel body plug
with Nitrile (NBR) O-ring
with Fluorocarbon (FKM) O-ring
35
42
16A5929X042
18B6542X022
18B6542X042
16A5929X012
16A5929X022
18B6542X052
18B6542X062
43
Closing Cap Gasket
Types S301D and S301F NPT TAP
15A6218X012
4
Inner Valve Assembly
Nitrile (NBR) with brass stem
20B9389X012
20B9389X022
20B9389X022
20B9389X042
29B9389X032
Nitrile (NBR) with Stainless steel stem
Nitrile (NBR) with Stainless steel stem (NACE)
Fluorocarbon (FKM) with Stainless steel stem
Fluorocarbon (FKM) with brass stem
Types 6352, 6353, 6354L, 6354M, and
6354H Pilots (Figure 3)
6
Valve Spring
Key Description
Part Number
For brass and Stainless steel stems
For Stainless steel stem (NACE)
Diaphragm Assembly
(includes plated steel diaphragm plate)
Nitrile (NBR) diaphragm and
Aluminum pusher post
Nitrile (NBR) diaphragm and
Stainless steel pusher post
Fluorocarbon (FKM) diaphragm and
Aluminum pusher post
1B797937022
19A2860X012
Parts kit (included are: valve plug, key 4; Diaphragm
7*
assembly, key 5; body plug gasket, key 12; Bellows
O-ring, key 17; closing cap gasket, key 20; and for the
P590 Series filter, filter element, key 2; and gasket, key 7)
1B7980000B2
1B7980X00A2
Type 6352
Type 6353
Type 6354
Pilot Body
Aluminum
R6352X00012
R6353X00012
R6354X00012
1
1B7980000C2
1B798525062
35A6228X012
8
9
Upper Spring Seat
Aluminum with 50 psig / 3.4 bar Type 1806H Relief 17A8075X012
Control Spring, plated steel
2 to 10 psig / 0.14 to 0.69 bar range,
(Types S301F and S301D)
2 to 20 psig / 0.14 to 1.4 bar range,
(Types S301F and S301D)
3 to 20 psig / 0.21 to 1.4 bar range, Green
5 to 35 psig / 0.35 to 2.4 bar range, Silver
35 to 100 psig / 2.4 to 6.9 bar range, Red
Adjusting Screw
Stainless steel
39A5971X012
Stainless steel with 50 psig / 3.4 bar
Type 1806H relief
Spring Case
Aluminum
Stainless steel
Body Plug
Aluminum
316 Stainless steel
Valve Plug and Stem Assembly
14A9673X012
17A8075X022
2
3
4
1B788327022
1B986027212
1B788327022
1K748527202
25A6220X012
28A9277X012
15A6221X012
15A6221X042
10
11
Aluminum bonnet
10B7192X012
1H305028982
1A946324122
Aluminum bonnet with 2 to 10 psi /
0.14 to 0.69 bar spring range
Locknut, plated steel (not used with Type 661)
Aluminum
Aluminum bonnet with 2 to 10 psi /
0.14 to 0.69 bar spring range
Nitrile (NBR) disk with Stainless steel stem (standard) 15A6207X012
Nitrile (NBR) disk with 316 Stainless steel
stem (NACE)
Fluorocarbon (FKM) with Stainless steel stem
(for use in Oxygen service)
Fluorocarbon (FKM) disk with 316 Stainless steel
stem (NACE)
15A6207X052
15A6207X042
15A6207X112
1C724018992
T13305T0012
10B2695X012
10B2696X012
12
13
14
Machine Screw, steel (6 required)
Hex Lock Plate, Aluminum
Threaded Lock Plate, Aluminum
- continued -
*Recommended spare part.
1. NACE International Standard MR0175.
2. Part included in trim package assembly can be ordered according to the parts kit trim package.
5
6350 Series
Types 6352, 6353, 6354L, 6354M, and
6354H Pilots (Figure 3) (continued)
Key Description
Part Number
Key Description
Part Number
5 Diaphragm Assembly
13
14
Vent Assembly
Machine Screw (6 required)
Aluminum
Stainless steel
Relief Valve Assembly
25 psig / 1.7 bar
25 psig / 1.7 bar (NACE)
25 psig / 1.7 bar (for Oxygen service)
25 psig / 1.7 bar (Stainless steel)
Type Y602-12
Type 6352, Nitrile (NBR)
Type 6353, Nitrile (NBR)
Type 6353, Fluorocarbon (FKM)
Type 6353, Fluorocarbon (FKM)
(for use in Oxygen service)
Type 6354, Neoprene (CR)
Type 6354, Fluorocarbon (FKM)
Type 6352 (NACE), Nitrile (NBR)
Type 6353 (NACE), Nitrile (NBR)
Type 6353 (NACE), Fluorocarbon (FKM)
Type 6354 (NACE), Neoprene (CR)
Type 6354 (NACE), Fluorocarbon (FKM)
Control Spring
15A6216X012
15A6216X022
15A6216X092
10B6189X022
1V4360X0022
15
15A6216X162
15A6216X032
15A6216X152
15A6216X552
15A6216X542
15A6216X562
15A6216X572
15A6216X582
16A5929X052
16A5929X042
16A5929X032
16A5929X072
16* Bellows Assembly
Standard for all except in Oxygen service
For use in Oxygen service
17* O-ring
15A6202X032
15A6202X022
6
Standard for all except in Oxygen service
For use in Oxygen service, Fluorocarbon (FKM)
Filter
P590 Series (standard)
P590 Series for NACE service
Closing Cap Gasket
Pipe Nipple
For standard and corrosive service
For NACE service
For corrosive NACE service
Restriction
Standard
High
Diaphragm Limiter
Aluminum
Stainless steel
1D682506992
1D6825X0012
Type 6352
14 in. w.c. to 2 psig / 35 mbar to 0.14 bar
2 to 10 psig / 0.14 to 0.69 bar, Black
DVGW 4 to 10 psig / 0.28 to 0.69 bar
Type 6353
3 to 40 psig / 0.21 to 2.8 bar
35 to 125 psig / 2.4 to 8.6 bar
DVGW 10 to 40 psig / 0.69 to 2.8 bar
DVGW 40 to 58 psig / 2.8 to 4.0 bar
Type 6354L
85 to 200 psig / 5.9 to 13.8 bar
Type 6354M
175 to 220 psig / 12.1 to 15.2 bar
Type 6354H
14A9672X012
14A9673X012
14A9673X012
19
Type P514-1
Type P513-1
15A6218X012
20
21
1E392527022
1K748527202
1E392527022
1K748527022
1C488226232
1C4882X0032
1C488238982
22
23
1L346127142
1L346127142
15A9258X012
17A2030X012
17A2029X012
15A9259X012
10B4407X012
19A6034X012
1U7581X0022
200 to 300 psig / 13.8 to 20.7 bar
Spring Seat
Type 6352 or 6353
Type 6354L, 6354M, or 6354H
Stem Guide
416 Stainless steel (standard)
410 Stainless steel (NACE)
Adjusting Screw
7
8
9
26
27
NACE Tag
Tag Wire
1B798525062
1K155828982
15A6222X012
15A6222X022
The following parts are for Type 6353
only (not shown in Figure 3)
Type 6352
Type 6353
Type 6354
10B3692X012
10B7192X012
10B6190X012
Key Description
Part Number
28
29
30
31
32
33
34
Packing Bonnet
Packing Nut
Handwheel
Washer
Screw
1L449635072
0P077624102
1L217544992
1A329128982
1E985428982
1F125437012
1B487099202
1K885035072
1F124801012
1F124401012
1F125236042
1C752601012
21B5621X012
10
11
12
Locknut
Type 6352
Type 6353 or 6354
Closing Cap
1C724018992
1A946324122
Aluminum spring case
23B9152X012
1H2369X0032
Packing Spring
Packing Box Gasket
Stainless steel spring case
Body Plug Gasket / O-ring
For Aluminum, composition
For Stainless steel body, Nitrile (NBR)
For Stainless steel body, Fluorocarbon (FKM)
35* Packing Follower
36* Male Adaptor
37* Female Adaptor
38* Packing Washer
39* Packing Ring (3 required)
1C495704022
1F113906992
1N463906382
40
Adjusting Screw
*Recommended spare part.
1. NACE International Standard MR0175.
2. Part included in trim package assembly can be ordered according to the parts kit trim package.
6
6350 Series
10
2
11
8
9
12
1
7
22
24
4
34A6635-B
23
3
6
3
CB7988
NEW TYPE 6351 ASSEMBLY DRAWING
SHOWING NEW BODY PLUG
AND BODY PLUG O-RING
OLD TYPE 6351 ASSEMBLY DRAWING
SHOWING OLD BODY PLUG AND BODY PLUG GASKET
42
Figure 2. Type 6351 Pilot Assembly
11
9
10
20
2
14
15
1
7
5
6
22
4
8
23
13
3
16
35A8889
35A6236
21
12
19
17
DETAIL OF TYPE 6354M OR 6354H PILOT
COMPLETE TYPE 6352, 6353, OR 6354L PILOT
Figure 3. Types 6352 through 6354H Pilot Assemblies
7
6350 Series
D103153X012 © 2008, 2019 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 07/19.
Emerson Automation Solutions
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Co. All other marks are the property of their prospective owners.
Fisher™ is a mark owned by Fisher Controls International LLC, a business
of Emerson Automation Solutions.
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they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
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