Emerson Fisher EZH Series User manual

D103680X012

R94

Europe, Middle East and Africa Only

Types EZH and EZHSO

May 2019

Types EZH and EZHSO Pressure Reducing Regulators

Failure to follow these instructions or to

properly install and maintain this equipment

could result in an explosion and/or re

causing property damage and personal

injury or death.

Fisher™ regulators must be installed,

operated and maintained in accordance

with federal, state and local codes, rules

and regulations and Emerson Process

Management Regulator Technologies,

Inc. instructions.

If the regulator vents gas or a leak develops

in the system, service to the unit may be

required. Failure to correct trouble could

result in a hazardous condition.

Call a gas service person to service the

unit. Only a qualied person must install

or service the regulator.

Figure 1. Type EZH Pressure Reducing Regulator

Figure 2. PRX Series Pressure Reducing Pilots

Types EZH, EZHSO, EZH OS2 and EZHSO

OS2 regulators are in conformity with the

Pressure Equipment Directive PED 2014/68/EU

and are classied in Category IV.

Instruction Manual

CONTENTS

Introduction ..................................................................... 2

Characteristics ................................................................ 3

Labelling .......................................................................... 5

Dimensions and Weights ................................................ 6

Description ...................................................................... 8

Principle of Operation ...................................................... 8

Monitoring Systems ......................................................... 12

Installation ...................................................................... 14

Startup and Adjustment .................................................. 16

Shutdown ........................................................................ 18

Maintenance ................................................................... 19

Troubleshooting .............................................................. 26

Spare Parts ..................................................................... 28

Parts List ......................................................................... 28

TYPE PRX-120/APTYPE PRX-120

WARNING

Types EZH and EZHSO

Europe, Middle East and Africa Only

INTRODUCTION

Scope of the Manual

This manual provides installation, startup, maintenance

and parts ordering information for the Types EZH and

EZHSO pressure-reducing regulators and Type PRX

pilot with Type SA/2 pilot supply lter regulator.

Information on other equipment used with this regulator

is found in separate manuals.

Product Description

Types EZH and EZHSO regulators are accurate pilot-

operated pressure balanced, soft-seated regulators.

They are designed for use in high pressure natural gas

transmission/city gate stations, large capacity distribution

systems and power plant feeds. They provide smooth,

reliable operation, tight shutoff and long life.

Type EZHSO "Spring-to-Open" version could be used

when other overpressure protection options are foreseen,

for example in a monitor conguration. In this case, in

event of failure, the main regulator will stay completely

open, allowing the monitor to take control. The monitor

could be "Spring-to-Close" to ensure a double protection

to downstream pipe.

Available Congurations:

• Types EZH and EZHSO ("E Body")

Single regulator without slam shut

• Types EZH and EZHSO ("X Body")

Single regulator in an X Body available for DN 25

through 150 sizes.

In case of modication made on a pressure equipment

like cap replacement by a slam shut it is mandatory

to comply to the local codes, rules and regulations.

• Types EZH OS2 and EZHSO OS2 ("X Body")

Single regulator with integrated slam shut available

for DN 25 through 150 sizes

• Type PRX/120-AP:

Outlet pressure range of 30 to 80 bar. The

Type PRX/120-AP can be used as the pilot on single

stage pressure reducing regulators, as the monitor pilot

or as the working pilot in wide-open monitor systems.

• Type PRX/125:

Identical to the Type PRX/120, except the restriction

screw is removed. The Type PRX/125 can only

be used as the monitor override pilot on working

monitor applications.

• Type PRX/125-AP:

Identical to the Type PRX/120-AP, except the restriction

screw is removed. The Type PRX/125-AP can only be

used as the monitor override pilot on working monitor

applications.

• Type PRX/131:

Set pressure range of 1.00 to 30.0 bar. The Type

PRX/131 is used as a booster or quick dump pilot to

increase main valve closing speed on a single stage

pressure reducing regulator or on the monitor regulator

in wide-open monitor systems.

• Type SA/2 Pilot Supply Filter Regulator:

The Type SA/2 pilot supply lter regulator provides a

constant pressure supply to the PRX Series pilot of 3 bar

over the set pressure. The Type SA/2 has an integral

5-micron lter. For easy maintenance a block valve

can be installed to separate the regulator from the pilot.

Pilot Description

Type PRX Pilot

The Types EZH and EZHSO pressure-reducing regulators

can be equipped with a PRX Series pilot mounted on the

main valve for pressure reducing or wide-open monitoring

applications. The PRX Series pressure reducing pilots

have the ability to handle a wide range of setpoints from

1 to 80 bar:

• Type PRX/120:

Outlet pressure range of 1 to 40 bar. The Type PRX/120

can be used as the pilot on single stage pressure

reducing regulators, as the monitor pilot or as the

working pilot in wide-open monitor systems.

Types EZH and EZHSO

Europe, Middle East and Africa Only

TYPE OUTLET PRESSURE

ADJUSTMENT RANGES, bar

AC (ACCURACY CLASS) PILOT CONTROL SPRING INFORMATION

TYPE EZH TYPE EZHSO SPRING COLOR

PRX/120 and

PRX/125

1.0 to 1.8

1.8 to 3.0

3.0 to 5.5

5.5 to 8.5

2.5%

Yellow

Green

Blue

Black

8.5 to 14.5

14.5 to 23.0

23.0 to 30.0

30.0 to 40.0

2.5%

Silver

Gold

Aluminium

Red

PRX/120-AP and

PRX/125-AP 30.0 to 80.0 1% 2.5% Clear

Table 2. Outlet Pressure Ranges, Accuracy Class and Pilot Spring Information

CHARACTERISTICS

Table 1. General Characteristics for Types EZH and EZHSO Regulator

OPERATING PRESSURE

A352LCC Body, Actuator,

Valve, Pilot Body, Slam shut PS 100 bar max

Associated BMS(1),

according to size PSD 10 to 100 bar

Type IS Integral strength(4)

OPERATING TEMPERATURE(2) TS -20 / 60°C Class 2; -30 / 71°C(5)

Sizes available DN 25, 50, 80, 100, 150 and 200

Noise level reduction Up to 8 dB

REGULATOR

European EN Standard EN 334

Inlet Pressure Pu2 to 100 bar

Outlet Pressure Pd1 to 80 bar

Minimum Differential ΔP

min

1 bar (Type EZH)

3.8 bar (DN 25, 50, 80 Type EZHSO)

1.8 bar (DN 100 Type EZHSO)

1 bar (DN 150, 200 Type EZHSO)

Maximum Differential ΔP

max

99 bar (Type EZH)

96.2 bar (Type EZHSO)

Accuracy (optimal) AC See Table 2

Lock-Up Pressure Class SG Up to 5%(3)

Lock-Up Pressure Zone Class SZ Up to 5%(3)

SLAM SHUT

European EN Standard EN 14382

Operation Class A or B (see Figure 3)

Maximum Operating Differential ΔP

max 100 bar

Response Time ta <1 s

Accuracy

Diaphragm,

Bellows AG Up to ±2.5%

Piston Up to ±5%

Set Pressure Range Wdu-

Wdo 0.010 / 100 bar

Flow Coefcient Qf13

Internal Automatic Bypass Cg25

Rearming Manual after rectication of fault

Position Indicator On mechanism box

FLUID

Groups 1 and 2 according to PED 2014/68/EU, Gas 1st and 2nd

family according to EN 437 or other gases (compressed air, nitrogen).

The gas must be non corrosive, clean (ltration on inlet side necessary)

and dry.

(1) BMS - Safety Manometric Box

(2) Standard version

(3) Contact us with your operating conditions

(4) Depending on BMS conguration for Type EZH OS2

(5) Optional

Regulator Options

• Silencer (Figure 24)

The Type EZH silencer (Whisper III) is integrated in the

regulator and is composed of a drilled cage. The Whisper

III silencer is available for DN 50, 80, 100, 150 and 200

and allows a noise attenuation up to 8dB.

• Flow Coefcient Reduction (Figure 16)

The ow reduction is realized by replacement of the

regulator standard seat by a reduction seat (key 2).

• Type RPE Electrical Pilot Heater (Figure 27)

The Type RPE is used for reheating the gas supplying

pressure reducing regulator pilots. The Type RPE avoids

the inconveniences caused by freezing which can occur

during high pressure drops.

Actuator

The actuator is an integral pressure type. All pressure parts

are designed to resist up to 100 bar. The diaphragm is

strong and can resist to a differential of 100 bar.

R95

R96

284 1078 2247 3567 6845 280 1088 2266 3696 7010 13,026

1 210 908 1684 2969 5464 218 829 1698 2902 5804 - - - -

2 126 671 1058 1763 3685 128 607 1066 1784 3670 7010

379 385 685 1062 2088 81 370 690 1072 2098 4051

550 2092 4359 6920 13,280 544 2110 4396 7170 13,600 25,270

1 408 1762 3266 5760 10,600 423 1609 3294 5630 11,260 - - - -

2 245 1301 2052 3420 7150 249 1177 2069 3460 7120 13,600

3 154 746 1328 2060 4050 157 718 1339 2080 4070 7860

31.3 38.3 30.8 32.5 32.8 35.5 33.5 30.8 31.4 31.4 35

134.3 35.3 33.9 35.3 35.0 38.7 31.9 33.9 34.2 35.9 - - - -

233.6 38.8 37.8 37.3 38.8 39.7 35.6 37.8 36.3 39.6 36.4

332.1 40.8 33.6 37.1 39.7 39.1 38.2 33.6 37.3 30.8 38.3

0 223 781 1693 2742 6103 255 793 1708 2789 6397 10,088

1 215 764 1418 2479 4974 209 716 1172 2438 5304 - - - -

2 140 603 975 1644 3495 127 566 984 1711 3449 6624

387 370 685 1041 2036 81 358 690 1057 2072 3892

0 433 1516 3285 5320 11,840 495 1539 3313 5410 12,410 19,570

1417 1482 2751 4810 9650 406 1389 2774 4730 10,290 - - - -

2273 1169 1892 3190 6780 247 1099 1908 3320 7080 12,850

3 168 718 1328 2020 3950 158 695 1339 2050 4020 7550

035.5 37 30.8 31.7 34.0 33.8 33.5 30.8 30.4 33.3 32.8

135.4 37.5 33.6 34.1 35.0 39.4 34.1 33.6 32.4 35.1 - - - -

232.3 39.5 37.1 36.4 37.6 39.9 35.7 37.1 35.7 37.1 39.3

332.9 39.4 38.3 37.6 39.6 39.9 37.7 38.3 37.3 39.6 39.6

Types EZH and EZHSO

Europe, Middle East and Africa Only

Table 4. Failure Mode Analysis

PART NAME FAILURE

(WORST CASE) CAUSE OF FAILURE EFFECT REGULATOR TYPE REGULATOR REACTION MODE

Filter Filter blocked/ clogged Debris or aromatics

present in the gas

Decrease of feeding

pressure gives decrease

of motorization pressure

EZHSO Open - - - -

EZH - - - - Close

Pilot Disk Pilot cannot be closed Debris or aromatics

present in the gas

Increase motorization

pressure

EZHSO Open - - - -

EZH Open - - - -

Pilot Lower

Diaphragm Pilot cannot control Debris or aromatics

present in the gas

Decrease motorization

pressure

EZHSO Open - - - -

EZH - - - - Close

Pilot Upper

Diaphragm

Pilot cannot feed

the regulator

Debris or aromatics

present in the gas

Decrease motorization

pressure

EZHSO Open - - - -

EZH - - - - Close

Regulator

Diaphragm

Not proper

performance of

the motorization

pressure chamber

Debris or aromatics

present in the gas

Balancing of pressures

and charge or discharge

of the motorization

pressure chamber

EZHSO Open - - - -

EZH - - - - Close

Pilot Frozen Pilot,

Type SA/2 working

Moisture in the gas,

high pressure drop

Type SA/2 loading upper

casing of regulator, Pilot

not supplying loading

pressure to lower casing

EZHSO - - - - Close

EZH - - - - Close

Table 3b. 2:1 Line Flow Coefcients, Regulator with Integrated Whisper III Silencer

TYPES EZH WITH WHISPER III AND EZHSO WITH WHISPER III

REDUCTION SLAM SHUT INTEGRATED (X BODY) WITHOUT SLAM SHUT (E BODY)

DN 25 DN 50 DN 80 DN 100 DN 150 DN 25 DN 50 DN 80 DN 100 DN 150 DN 200

Table 3a. 2:1 Line Flow Coefcients, Regulator and Slam-Shut Travel

TYPES EZH AND EZHSO

REDUCTION WITH SLAM SHUT (X BODY) WITHOUT SLAM SHUT (E BODY)

25 DN 50 DN 80 DN 100 DN 150 DN 25 DN 50 DN 80 DN 100 DN 150 DN 200

R96B

0062

(Gaz Naturel)

28320 Gallardon-France

REGULATEUR/

REGULATOR

GROUPE

N°

série

serial

Date Fab/Test

Mfg/Test date

Cat

norme

standard

EN 334

mode défaillance

failure mode

Pumax bar

FISHER

FRANCEL

PT bar

Temp TS -20/+60°C

Class

Type Cg

matériau

shell

A352LCC+A350LF2

bar

Other configurations available (contact factory)

EZH

Reduction0123

Cg See Table 3

Date DD MM YEAR

DN 25 50 80 100

Failure mode FC FO

EZHSO

PN16B PN25B PN40B

CL150 RF CL300 RF CL600 RF

150 300 600

CLASS

Pumax 18.9

18.9 100

32 79 158

100

16B 25B

26 40

40B

150 200

Reduction 01 23

Cg See Table3

0062

(Gaz Naturel)

28320 Gallardon-France

REGULATEUR/REGULATOR

EZH EZHSO

SECURITE/SLAM SHUT

GROUPE

N°

série

serial

Date Fab/Test

Mfg/Test date

CatPS

norme

standard

norme

standard

EN 334

mode défaillance

failure mode

classe sécurité

slam shut class

Pumax bar

FISHER

FRANCEL

PT bar Temp TS -20/+60°C

Class Type Cg

matériau

shell

A352LCC+A350LF2

OS2 -

Standard EN 14382 -

BMS 027/017 BMS 162

BMS 236/315 BMS 071

Min onlyAll

Max-Mintypes of BMS

Security Class

BMS Setting

Failure mode FC

DN 25 50 80 100

PN16B PN25B PN40B

Other configurations available (contact factory)

DD MM YEAR

bar

Max only

Depending on BMS

configuration

CL150 RF CL300 RF CL600 RF

150 300 600

CLASS

Pumax 18.9

18.9 100

32 79 158

100

16B 25B

26 40

40B

150

R97

Types EZH and EZHSO

Europe, Middle East and Africa Only

Figure 3. Types EZH OS2 and EZHSO OS2 Label (X Body)

LABELLING

Figure 4. Types EZH and EZHSO Label (E Body)

Connections

Inlet/Outlet : CL150 RF - CL300 RF - CL600

PN 16B - PN 25B - PN 40B

Other congurations available

(contact factory)

Pilot feed: 1/4 in. NPT female

Pilot Reject: 1/4 in. NPT female

Pilot impulse: 1/4 in. NPT female

Slam-shut impulse: 1/4 in. NPT female

BM* vent: 1/4 in. NPT female

Impulse tube diameter: Interior Ø 8/10 mm

Contact switch: See D103683X012

Material

Body: Steel

Connecting parts and bottom: Steel

Actuator: Steel

Regulator/Slam-shut orice: Stainless steel

Regulator valve plug: Stainless steel

Slam-shut valve plug: Stainless steel

Regulator plug disk/

Slam-shut O-rings: Nitrile (NBR) or

Fluorocarbon (FKM)

* BM - Mechanism Box

Other congurations available (contact factory)

IHK

25 mm

HIE

25 mm

R112a

I H

I HE

25 mm

Mechanism box

removal clearance

25 mm

Mechanism box

removal clearance

25 mm

R114a

R113a

DN 25, 50, 80 DN 100, 150

DN 25, 50, 80, 100, 150

25 49 50 51

50 81 83 85

80 168 175 177

100 237 250 265

150 680 690 696

181 204 223 162 71 74

100

150

25 184 197 210 193.5 250 290 310 315 320 260 250 113 280 190 38

50 254 267 286 254 267 265 320 320 330 380 310 310 144 270 190

80 298 317 337 310 317 301 400 400 366 500 390 390 200 270 270 51

100 352 368 394 350 368 345 442 427 410 580 394 394 240 140

150 451 473 508 451 473 330 635 635 395 700 432 432 330 457 70

Types EZH and EZHSO

Europe, Middle East and Africa Only

DIMENSIONS AND WEIGHTS

Table 6b. Dimensions - Types EZH OS2 and EZHSO OS2

Figure 6. Dimensions - Types EZH OS2 and EZHSO OS2

(Vertical Position)

MAXIMUM OVERALL DIMENSIONS, mm

D E

CL150 CL300 CL600 PN 16B PN 25B PN 40B Type PRX

Horizontal

Type PRX

Vertical

Type PRX

Horizontal

Type PRX

Vertical

Type PRX

Horizontal

Type PRX

Vertical

DN WEIGHTS, kg

CL150/PN 16B CL300/PN 25B/PN 40B CL600

Table 5. Approximate Regulator Weights

Types EZH OS2 and EZHSO OS2

OVERALL DIMENSIONS, mm

F G

Diaphragm Piston Bellows Diaphragm Piston Bellows

Table 6a. Dimensions - Types EZH OS2 and EZHSO OS2

Figure 5. Dimensions - Types EZH OS2 and EZHSO OS2

(Horizontal Position)

For Type EZHSO OS2 version add 1 kg.

Indicator cover

removal clearance

Indicator cover

removal clearance

Mechanism box

removal clearance

Mechanism box

removal clearance

Mechanism box

removal clearance

I H

Indicator cover

removal clearance

J I H

Indicator cover

removal clearance

R115a

I H

Indicator cover

removal clearance

J I H

Indicator cover

removal clearance

I H

Indicator cover

removal clearance

J I H

Indicator cover

removal clearance

R116a

R117a

DN 100, 150, 200(1)

DN 25, 50, 80

DN 25, 50, 80, 100, 150, 200

25 38 39 40

50 71 74 75

80 145 151 153

100 211 224 239

150 646 656 662

200 832 842 850

25 184 197 210 193.5 62 290 310 320 260 250 113 280 190 38

50 254 267 286 254 267 83 320 320 380 310 310 144 270 190

80 298 317 337 310 317 105 400 400 500 390 390 200 270 270 51

100 352 368 394 350 368 137 442 427 580 394 394 240 140

150 451 473 508 451 473 135 635 635 700 432 432 330 457 70

200 543 568 610 543 568 210 724 724 700 432 432 330 457 70

Types EZH and EZHSO

Europe, Middle East and Africa Only

Table 7. Approximate Regulator Weights

Types EZH and EZHSO(1)

Figure 8. Dimensions - Types EZH and EZHSO

(Vertical Position)

MAXIMUM OVERALL DIMENSIONS, mm

CL150 CL300 CL600 PN 16B PN 25B PN 40B Type PRX

Horizontal

Type PRX

Vertical

Type PRX

Horizontal

Type PRX

Vertical

Type PRX

Horizontal

Type PRX

Vertical

DN WEIGHTS, kg

CL150/PN 16B CL300/PN 25B/PN 40B CL600

Table 8. Dimensions - Types EZH and EZHSO

Figure 7. Dimensions - Types EZH and EZHSO

(Horizontal Position)

(1) For Type EZHSO version add 1 kg.

Indicator cover

removal clearance

Indicator cover

removal clearance

R98

INLET PRESSURE (Pu)

OUTLET PRESSURE (Pd)

MOTORIZATION PRESSURE (Pm)

PILOT FEEDING PRESSURE (Pup)

ATMOSPHERIC PRESSURE (Pb)

Types EZH and EZHSO

Europe, Middle East and Africa Only

DESCRIPTION

The Types EZH and EZHSO regulators consist of:

• Version without Integral Slam-Shut Valve:

- An "E Body" or an "X Body plus a cap"

- A compensation valve, an interchangeable orice

- An actuator with position indicator

- A pilot system adapted to the required pressure setpoint

• Version with Integral Slam-Shut Valve:

- Same parts and sub-assemblies as in the version

without slam shut

- An "X Body"

- A valve with tight shut-off O-ring

- An automatic slam-shut bypass

- A release relay Type OS2 (see Instruction Manual

D103683X012) consisting of:

- A mechanism box (BM)

- A safety manometric box (BMS) connected to

the outlet side of the regulator

PRINCIPLE OF OPERATION

Type EZH - Spring-to-Close Version

Type EZH Single-Pilot Regulator

(Figures 9 and 10)

The pilot-operated Type EZH uses inlet pressure as

the operating medium, which is reduced through pilot

operation to load the actuator diaphragm (lower chamber).

Outlet pressure (Pd) is supplied to the regulator actuator

diaphragm (upper chamber). This pressure assists the

main spring that tends to close the regulator, and opposes

the motorization pressure (Pm) in the actuator. Outlet

pressure (Pd) also opposes the pilot control spring.

Figure 9. Type EZH DN 25/50/80 (Spring-to-Close Version) Operational Schematic

Filter

Type SA/2

Type

PRX/120

Type EZH

Inlet pressure (Pu)

Motorization pressure (Pm)

Pilot feeding pressure (Pup)

Outlet pressure (Pd)

Atmospheric pressure (Pb)

Upper

diaphragm

Lower

diaphragm

Regulator

diaphragm

Pilot disk

Type PRX:

S - Bleed port

B - Supply port

Type SA/2:

V - Sensing

R - Pilot

M - Inlet

L - Motorization port

A - Sensing port

INLET PRESSURE (Pu)

OUTLET PRESSURE (Pd)

MOTORIZATION PRESSURE (Pm)

PILOT FEEDING PRESSURE (Pup)

ATMOSPHERIC PRESSURE (Pb)

RP IP

Types EZH and EZHSO

Europe, Middle East and Africa Only

Figure 10. Type EZH-OS2 DN 100/150 (Spring-to-Close Version) Operational Schematic

Inlet pressure (Pu)

Motorization pressure (Pm)

Pilot feeding pressure (Pup)

Outlet pressure (Pd)

Atmospheric pressure (Pb)

Type PRX:

S - Bleed port

B - Supply port

L - Motorization port

A - Sensing port

When the outlet pressure (Pd) drops below the setting of

the pilot control spring, pilot control spring force on the

pilot diaphragm thus opens the pilot valve plug, providing

additional motorization pressure (Pm) to the lower chamber

of the actuator diaphragm. This diaphragm motorization

pressure opens the main valve plug, supplying the required

ow to the downstream system.

Any excess motorization pressure on the actuator

diaphragm escapes downstream through the bleed

restriction in the pilot.

When the gas demand in the downstream system

has been satised, the outlet pressure (Pd) increases.

When outlet pressure (Pd) increases over the setting of

the pilot spring, the pilot valve disk will be closed, reducing

motorization pressure (Pm) to the lower chamber of the

main valve actuator. The pressure in the upper chamber

and the main spring will force the regulator to close.

Type SA/2:

V - Sensing

R - Pilot

M - Inlet

The excess of motorization pressure (Pm) acting on both

the main diaphragm and Type PRX pilot bleeds to the

downstream system through a bleed restriction in the pilot.

For Types EZH DN 100, 150 and 200 a check valve

(Figure 28) is installed between outlet pressure and

motorization pressure impulse lines; this valve is designed

to protect the diaphragm assembly from wrong procedures

during startup, avoiding a too high pressure differential

between outlet and motorization pressure.

INLET PRESSURE (Pu)

OUTLET PRESSURE (Pd)

MOTORIZATION PRESSURE (Pm)

PILOT FEEDING PRESSURE (Pup)

ATMOSPHERIC PRESSURE (Pb)

Types EZH and EZHSO

Europe, Middle East and Africa Only

Figure 11. Type EZHSO DN 25/50/80 (Spring-to-Open Version) Operational Schematic

Filter Type

SA/2

Type

PRX/120

Type EZHSO

Upper diaphragm

Lower diaphragm

Regulator

diaphragm

Pilot disk

Type EZHSO - Spring-to-Open Version

Type EZHSO Single-Pilot Regulator

(Figures 11 and 12)

The pilot-operated Type EZHSO (Spring-to-

Open version) will fail in open position in

case of main valve diaphragm failure or lack

of pressure supply to the pilot (see Table 4

for Failure Mode Analysis).

Type EZHSO uses inlet pressure as the operating

medium, which is reduced through pilot operation to load

the actuator diaphragm (lower chamber). Pilot feeding

pressure (Pup) is provided to the regulator actuator

diaphragm (upper chamber). This pressure opposes the

main spring force that tends to open the regulator and

the motorization pressure (Pm). Outlet or downstream

pressure (Pd) opposes the pilot control spring.

Inlet pressure (Pu)

Motorization pressure (Pm)

Pilot feeding pressure (Pup)

Outlet pressure (Pd)

Atmospheric pressure (Pb)

Type PRX:

S - Bleed port

B - Supply port

Type SA/2:

V - Sensing

R - Pilot

M - Inlet

L - Motorization port

A - Sensing port

PRX Series pilot is supplied with pressure coming from

pre-regulator Type SA/2, which reduces inlet pressure

(Pu) to the value of outlet pressure (Pd) plus approximately

3 bar.

When outlet pressure drops below the setting of the

pilot control spring, pilot control spring force on the pilot

diaphragm opens the pilot valve plug, providing additional

motorization pressure (Pm) to the actuator diaphragm.

This diaphragm motorization pressure opens the main

valve plug, supplying the required ow to the downstream

system. Any excess motorization pressure on the actuator

diaphragm escapes downstream through the bleed

restriction in the pilot.

CAUTION

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