EMERSON 6350 Series Pilots for Pilot Operated Pressure Reducing Regulators Instruction Manual

Instruction Manual for EMERSON models including: 6350 Series Pilots for Pilot Operated Pressure Reducing Regulators, 6350 Series, Pilots for Pilot Operated Pressure Reducing Regulators, Operated Pressure Reducing Regulators, Pressure Reducing Regulators, Reducing Regulators, Regulators

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EMERSON FISHER 6354M (01)

Instruction Manual D103153X012
July 2019

6350 Series

6350 Series Pilots for Pilot-Operated Pressure Reducing Regulators

VALVE PLUG SPRING BLEED HOLE

BELLOWS BALANCED VALVE PLUG

UNBALANCED VALVE PLUG

REMOVABLE VENT
SCREW-IN BLEED RESTRICTION

W6956
TYPE 6350 SERIES ON A TYPE 1098-EGR REGULATOR

W3149-1*

DETAIL OF TYPE 6351 PILOT

W3160-2*
DETAIL OF TYPE 6352, 6353, OR 6354L PILOT

Figure 1. 6350 Series Pressure Reducing Pilot Constructions

Introduction
Scope of the Manual
This manual provides installation, startup, maintenance, and parts ordering information for the 6350 Series pilots used together with PilotOperated 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

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.

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6350 Series

Specifications
The Specifications section lists pressure limitations and other specifications for various models of 6350 Series pilots. Please note that the pilot control spring range is displayed on the pilot spring case, and the pilot restriction code is stamped on the pilot body (S=standard gain, L=low gain, H=high gain).

Maximum Pilot Supply Pressure(1)(2) 600 psig / 41.4 bar
Outlet Pressure Ranges See Table 1
Process 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

Pilot Restriction Code S - Standard gain L - Low Gain H - High gain
Connections(3) 1/4 NPT internal
Approximate Weight 2 pounds / 1 kg

1. The pressure/temperature limits in this instruction manual or any applicable standard limitation should not be exceeded. 2. For stability or overpressure protection, a reducing regulator may be installed upstream of the pilot according to the Installation section. 3. Connections threaded to various national or international standards can usually be supplied. Contact your local Sales Office.

PILOT TYPE
6351
6352
6353 6354L(1) 6354M(2) 6354H 1. Without diaphragm limiter. 2. With diaphragm limiter.

Table 1. Outlet Pressure Ranges

OUTLET (CONTROL) PRESSURE RANGE

3 to 20 psig 5 to 35 psig 35 to 100 psig

0.21 to 1.4 bar 0.35 to 2.4 bar 2.41 to 6.9 bar

14 in. w.c. to 2 psig 2 to 10 psig

35 mbar to 0.14 bar 0.14 to 0.69 bar

3 to 40 psig 35 to 125 psig

0.21 to 2.8 bar 2.4 to 8.6 bar

85 to 200 psig(1) 175 to 220 psig(2) 200 to 300 psig(2)

5.9 to 13.8 bar(1) 12.1 to 15.2 bar(2) 13.8 to 20.7 bar(2)

SPRING COLOR
Green Silver Red
Yellow Black
Yellow Red
Blue Blue Green

SPRING PART NUMBER
1B986027212 1B788327022 1K748527202
14A9672X012 14A9673X012
1E392527022 1K748527202
1L346127142 1L346127142 15A9258X012

Principle of Operation
Pilot-operated regulators use inlet pressure as the operating medium, which is reduced through pilot operation to load the actuator diaphragm. Outlet or downstream pressure opposes loading pressure in the actuator and also opposes the pilot control spring.
In operation, assume that outlet pressure is below the pilot control setting. Control spring force on the pilot diaphragm thus opens the pilot valve plug providing additional loading pressure to the actuator diaphragm. This loading pressure forces the actuator stem forward, opening the main valve plug via a bump connection. The upward motion of the plug allows gas to flow through the cage into the downstream system.
When downstream demand has been satisfied, outlet pressure will increase, acting on the pilot and actuator diaphragm. This pressure exceeds the pilot control spring setting, moving the pilot diaphragm away and

letting the valve plug spring (Type 6351) or bellows (Types 6352 through 6354M pilots) close the pilot valve plug (unbalanced in the Type 6351 but balanced in the Types 6352 through 6354M pilots). Excess loading pressure on the actuator diaphragm escapes downstream through the bleed hole (Type 6351 pilot) or restriction (Types 6352 through 6354M pilots).
Reduced actuator loading pressure permits the main valve to close. The combination of main valve spring force and valve plug unbalance provides positive valve plug shutoff against the port and upper seals.
All 6350 Series pilots have an internal check valve that allows loading pressure to bleed downstream at approximately 25 psig / 1.7 bar differential across the actuator diaphragm.

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6350 Series

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.
! WARNING
In hazardous or flammable gas service, vented gas may accumulate, and cause personal injury, death, or property damage due to fire or explosion.
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.
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.
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.

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.
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
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.
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 FisherTM takes in meeting all manufacturing requirements (heat treating, dimensional tolerances, etc.), use only replacement parts manufactured or furnished by Fisher.
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.

CAUTION
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.

! WARNING
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.

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Type 6351 Pilot
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.
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. 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), 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).
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.

Note
The body (key 1) may remain on the pipe nipple (key 21, Figure 3) unless the entire pilot is replaced.
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).
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.
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.
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.

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6350 Series

Parts List

Type 6351 Pilot (Figure 2)
Key Description

Part Number

Parts Kit (includes keys 3, 4, 6, 7 and for the P590 Series filter, keys 2 and 7)

R6351X00012

1 Body Assembly

Aluminum with brass bushing

1B7971X0092

Aluminum with Stainless steel bushing (NACE) 1B7971X0342

Stainless steel with Stainless steel bushing

1B7971X0122

2 Bonnet Aluminum with closing cap

25A6220X012

3 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

18B6542X022 18B6542X042
18B6542X052 18B6542X062

4 Inner Valve Assembly

Nitrile (NBR) with brass stem

20B9389X012

Nitrile (NBR) with Stainless steel stem

20B9389X022

Nitrile (NBR) with Stainless steel stem (NACE) 20B9389X022

Fluorocarbon (FKM) with Stainless steel stem 20B9389X042

Fluorocarbon (FKM) with brass stem

29B9389X032

6 Valve Spring For brass and Stainless steel stems For Stainless steel stem (NACE)
7* 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
1B7980000B2 1B7980X00A2 1B7980000C2

8 Upper Spring Seat

1B798525062

9 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
10 Adjusting Screw Aluminum bonnet Aluminum bonnet with 2 to 10 psi / 0.14 to 0.69 bar spring range
11 Locknut, plated steel (not used with Type 661) Aluminum Aluminum bonnet with 2 to 10 psi / 0.14 to 0.69 bar spring range

14A9673X012
1B788327022 1B986027212 1B788327022 1K748527202
10B7192X012
1H305028982
1A946324122
1C724018992

12 Machine Screw, steel (6 required)

T13305T0012

13 Hex Lock Plate, Aluminum

10B2695X012

14 Threaded Lock Plate, Aluminum

10B2696X012

Key Description
22 Pipe Nipple, Standard and Corrosive service, Galvanized plated steel (use with P590 Series) Steel (NACE)
24 Filter P590 Series (standard) P590 Series for NACE service
28 Closing Cap Aluminum bonnet (plastic cap)
35 Vent Assembly 42 Relief Valve Assembly
Aluminum/302 Stainless steel (NACE) Aluminum/Stainless steel
(Types S301D and S301F) All other assemblies 43 Closing Cap Gasket Types S301D and S301F NPT TAP

Part Number
1C488226232 1C4882X0032
Type P514-1 Type P513-1 23B9152X012 Type Y602-12 16A5929X042 16A5929X012 16A5929X022 15A6218X012

Types 6352, 6353, 6354L, 6354M, and 6354H Pilots (Figure 3)

Key Description

Part Number

Parts kit (included are: valve plug, key 4; Diaphragm 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)

Type 6352

R6352X00012

Type 6353

R6353X00012

Type 6354

R6354X00012

1 Pilot Body

Aluminum

35A6228X012

Aluminum with 50 psig / 3.4 bar Type 1806H Relief 17A8075X012

Stainless steel

39A5971X012

Stainless steel with 50 psig / 3.4 bar

Type 1806H relief

17A8075X022

2 Spring Case

Aluminum

25A6220X012

Stainless steel

28A9277X012

3 Body Plug

Aluminum

15A6221X012

316 Stainless steel

15A6221X042

4 Valve Plug and Stem Assembly

Nitrile (NBR) disk with Stainless steel stem (standard) 15A6207X012

Nitrile (NBR) disk with 316 Stainless steel

stem (NACE)

15A6207X052

Fluorocarbon (FKM) with Stainless steel stem

(for use in Oxygen service)

15A6207X042

Fluorocarbon (FKM) disk with 316 Stainless steel

stem (NACE)

15A6207X112

- 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.

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Types 6352, 6353, 6354L, 6354M, and 6354H Pilots (Figure 3) (continued)

Key Description

Part Number

5 Diaphragm Assembly 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)
6 Control Spring 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 200 to 300 psig / 13.8 to 20.7 bar
7 Spring Seat Type 6352 or 6353 Type 6354L, 6354M, or 6354H
8 Stem Guide 416 Stainless steel (standard) 410 Stainless steel (NACE)
9 Adjusting Screw Type 6352 Type 6353 Type 6354
10 Locknut Type 6352 Type 6353 or 6354
11 Closing Cap Aluminum spring case Stainless steel spring case
12 Body Plug Gasket / O-ring For Aluminum, composition For Stainless steel body, Nitrile (NBR) For Stainless steel body, Fluorocarbon (FKM)

15A6216X012 15A6216X022 15A6216X092
15A6216X162 15A6216X032 15A6216X152 15A6216X552 15A6216X542 15A6216X562 15A6216X572 15A6216X582
14A9672X012 14A9673X012 14A9673X012
1E392527022 1K748527202 1E392527022 1K748527022
1L346127142
1L346127142
15A9258X012
1B798525062 1K155828982
15A6222X012 15A6222X022
10B3692X012 10B7192X012 10B6190X012
1C724018992 1A946324122
23B9152X012 1H2369X0032
1C495704022 1F113906992 1N463906382

Key Description
13 Vent Assembly 14 Machine Screw (6 required)
Aluminum Stainless steel 15 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) 16* Bellows Assembly Standard for all except in Oxygen service For use in Oxygen service 17* O-ring Standard for all except in Oxygen service For use in Oxygen service, Fluorocarbon (FKM) 19 Filter P590 Series (standard) P590 Series for NACE service 20 Closing Cap Gasket 21 Pipe Nipple For standard and corrosive service For NACE service For corrosive NACE service 22 Restriction Standard High 23 Diaphragm Limiter Aluminum Stainless steel 26 NACE Tag 27 Tag Wire

Part Number
Type Y602-12
10B6189X022 1V4360X0022
16A5929X052 16A5929X042 16A5929X032 16A5929X072
15A6202X032 15A6202X022
1D682506992 1D6825X0012
Type P514-1 Type P513-1 15A6218X012
1C488226232 1C4882X0032 1C488238982
17A2030X012 17A2029X012
15A9259X012 10B4407X012 19A6034X012 1U7581X0022

The following parts are for Type 6353 only (not shown in Figure 3)

Key Description

Part Number

28 Packing Bonnet 29 Packing Nut 30 Handwheel 31 Washer 32 Screw 33 Packing Spring 34 Packing Box Gasket 35* Packing Follower 36* Male Adaptor 37* Female Adaptor 38* Packing Washer 39* Packing Ring (3 required) 40 Adjusting Screw

1L449635072 0P077624102 1L217544992 1A329128982 1E985428982 1F125437012 1B487099202 1K885035072 1F124801012 1F124401012 1F125236042 1C752601012 21B5621X012

*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.

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10 11
2 8
9 12
7 1
22 24

6350 Series

34A6635-B

CB7988

OLD TYPE 6351 ASSEMBLY DRAWING SHOWING OLD BODY PLUG AND BODY PLUG GASKET

4 6

NEW TYPE 6351 ASSEMBLY DRAWING

SHOWING NEW BODY PLUG

AND BODY PLUG O-RING

Figure 2. Type 6351 Pilot Assembly

35A8889

DETAIL OF TYPE 6354M OR 6354H PILOT

35A6236

COMPLETE TYPE 6352, 6353, OR 6354L PILOT

Figure 3. Types 6352 through 6354H Pilot Assemblies

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6350 Series

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D103153X012 © 2008, 2019 Emerson Process Management Regulator Technologies, Inc. All rights reserved. 07/19. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. FisherTM is a mark owned by Fisher Controls International LLC, a business of Emerson Automation Solutions.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Emerson Process Management Regulator Technologies, Inc does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson Process Management Regulator Technologies, Inc. product remains solely with the purchaser.

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References