Emerson Fisher OS2 Instruction Manual Download Page 1

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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 fire

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 qualified 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 classified in Category IV.

Instruction Manual

CONTENTS

TYPE PRX-120/AP

TYPE PRX-120

WARNING

Summary of Contents for Fisher OS2

Page 1: ...tem 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 qualified 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 D...

Page 2: ...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 work...

Page 3: ...uropean 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 Coefficient Qf 13 Internal Automatic Bypass Cg 25 Rearming Manual after rectification of fault Position Indicator On mechanism box FLUID Groups 1 and 2 according to PE...

Page 4: ...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 P...

Page 5: ...Min only All Max Min types of BMS Security Class A B BMS Setting Failure mode FC DN 25 50 80 100 PN16B PN25B PN40B Other configurations available contact factory DD MM YEAR bar Max only FO Depending on BMS configuration IS DS CL150 RF CL300 RF CL600 RF 150 300 600 CLASS PT PS Pumax 18 9 18 9 100 32 79 158 50 50 100 16B 25B 16 16 26 40 25 25 40B 40 63 40 PN 150 R97 Types EZH and EZHSO Europe Middle...

Page 6: ...rope 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 DN MAXIMUM OVERALL DIMENSIONS mm A B C D E H I J K 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...

Page 7: ...5 400 400 500 390 390 200 270 270 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 DN MAXIMUM OVERA...

Page 8: ...cted 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 a...

Page 9: ...tream 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 satisfied 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 ...

Page 10: ...ator 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 Motoriza...

Page 11: ...from wrong procedures during startup avoiding a too high pressure differential between outlet and motorization pressure EZH and EZHSO Series Adjustment The adjustment of the regulator is performed by means of the pilot adjusting screw which causes variation of the compression of the control spring Adjustment is performed while the regulator is in operation with the aid of a pressure gauge to monit...

Page 12: ...tems In normal operation of a wide open configuration the working regulator controls the system s outlet pressure With a higher outlet pressure setting the monitor regulator senses a pressure lower than its setpoint and tries to increase outlet pressure by going wide open If the working regulator fails the monitoring regulator assumes control and holds the outlet pressure at its outlet pressure se...

Page 13: ...roper operation In normal operation the working regulator controls the outlet pressure of the system The monitoring regulator s working pilot Type PRX 120 or PRX 120 AP controls the intermediate pressure and the monitor pilot Type PRX 125 or PRX 125 AP senses the system s outlet pressure If the working regulator fails the monitoring pilot Type PRX 125 or PRX 125 AP will sense the increase in outle...

Page 14: ...allation is in compliance with all applicable code and regulations Physical damage to the regulator can break the pilot off the main valve causing personal injury and property damage due to bursting of pressure containing parts To avoid such injury and damage install the regulator in a safe location Only personnel qualified through training and experience should install operate and maintain a regu...

Page 15: ...e or stack opening must be protected against condensation or clogging All Installations Single Regulator or Monitor Systems A Type EZH or EZHSO regulator bleeds no gas to atmosphere during normal operation thus making the regulator suitable for installation in pits and other enclosed locations without elaborate venting systems This regulator can also be installed in pits subject to flooding by ven...

Page 16: ...om the upstream piping to the inlet M port of the downstream Type SA 2 pilot supply filter regulator 3 Connect a control sense line from the A port of the upstream working Type PRX pilot to the intermediate pressure portion of piping using 8 10 inside diameter tube 4 Connect a downstream bleed line from the S port of the upstream working Type PRX pilot to the intermediate pressure portion of pipin...

Page 17: ...tion adjust the upstream working pilot until intermediate pressure is higher than the desired setpoint of the monitor pilot Adjust the downstream monitoring pilot to the desired monitoring takeover pressure Reduce the upstream pilot to the normal outlet pressure setting For a wide open upstream monitor installation adjust the downstream working pilot to a setpoint higher than the setpoint of the m...

Page 18: ...e decreases the spring compression and pressure setting When the required pressure setting is maintained for several minutes tighten the locknut to lock the adjusting screw in position Type PRX Pilot Restrictor and Damper Screw Adjustment Note Recommended initial setting of the restrictor screw is turned completely in clockwise and then turned out 1 2 turn The damper screw initial setting is turne...

Page 19: ...n and the seat edge up To check O ring key 7 skip to the Intermediate Flange O ring Maintenance section Place the cage key 3 on top of seat ring The cage will engage the step on the seat ring 7 Place the disk holder assembly key 30 and disk retainer key 31 on the sleeve adaptor key 27 8 For EZH Series Insert the spring lock washers key 32 and hex socket cap screws key 33 and tighten For EZHSO Seri...

Page 20: ...essary 12 For EZH Series Place disk assembly key 30 onto disk retainer key 31 Place disk retainer assembly into sleeve adapter key 27 and align screw holes For EZHSO Series Place disk holder assembly key 30 into sleeve adaptor key 27 and align screw holes 13 Place lock washer key 32 on screws key 33 14 For EZH Series Screw together the disk retainer assembly into the sleeve adapter assembly For EZ...

Page 21: ...tuator casing key 5 intermediate flange key 25 and body key 1 to indicate proper alignment 2 Remove travel indicator assembly keys 138 139 140 141 142 143 144 145 and 192 by loosening the travel indicator fitting key 141 and lifting out the travel indicator assembly 3 For EZH Series Replace the two opposite bolts keys 21 22 and 23 with the two threaded stems and nuts delivered with the unit Secure...

Page 22: ...r fitting key 141 8 Remove screws key 24 Lift off the lower actuator casing key 5 For EZH Series Remove screws key 33 and spring lock washers key 32 Lift off the disk holder assembly key 30 and disk retainer key 31 For EZHSO Series Remove the hex socket cap screw key 154 Lift off the disk holder assembly key 30 9 Slide the sleeve key 14 out of the lower actuator casing key 5 and slide the outlet p...

Page 23: ...placed if damaged 8 Lubricate O ring key 34 and replace into the body 9 Place seat ring key 2 on top of O ring in body 10 Place cage key 78 on the top of seat ring key 2 11 Screw sleeve guide into lower casing key 5 utilizing cap key 70 or crowbar 12 Lubricate the sleeve key 14 in the upper plate contact area and assemble the diaphragm plates system on the sleeve system 13 Screw the captured screw...

Page 24: ...eat key 52 not recommended from the body key 47 requires a special extraction tool Type PRX Pilot Maintenance Figure 25 Always remove spring key 7 tension before performing maintenance on this unit To remove spring tension loosen locknut key 2 and backout adjusting screw key 1 until compression is removed from the spring Lower Case Maintenance 1 Disconnect pilot and remove it from the line 2 Remov...

Page 25: ...y 16 on top of the lower diaphragm plate key 15 9 Set the upper diaphragm plate key 13 on top of the diaphragm key 14 10 Place washer key 11 and stem nut key 26 on the stem key 23 and tighten using a wrench to hold the stem 11 Set the spring carrier key 6 Damper and Restrictor Maintenance 1 Remove the screw key 31 and plate key 29 2 Remove bolts key 30 3 Remove the damper adjusting screw key 27 Re...

Page 26: ...key 11 4 Clean nets key 8 Replace filter pad key 12 5 Inspect diaphragm key 18 for damage or wear and replace if necessary Check the seating surface of the screw unit key 17 for erosion scratches spurs or other damage and replace if necessary 6 Unscrew and remove the regulator seat key 5 Inspect the O ring key 6 for damage or wear and replace if necessary Lightly lubricate the O ring and place it ...

Page 27: ...Allen 3 4 150 M5 Allen 4 4 M20 30 315 200 DN Stem nut Key 151 Figures 18 19 Hex nut Key 152 Figures 18 19 Stem nut Key 155 Figures 18 Metric Spanner Torque Nm Metric Spanner Torque Nm Metric Spanner Torque Nm 25 M10 17 43 M8 special 19 41 50 M12 19 54 80 61 81 100 68 150 M16 24 61 M16 24 65 200 Table 10 Torque Specifications R118 SYMPTOM CAUSE ACTION If outlet pressure is stable Observe the evolut...

Page 28: ...SA 2 kit Figure 25 1 M2200250X12 Table 11 Spare Parts R119 PARTS LIST Type EZH Figures 16 17 18 19 Key Description 1 Body 2 Seat 3 Cage 4 Anti friction ring 5 Actuator lower casing 6 Cap screws 7 O ring 8 Anti friction ring 9 O ring 10 Pipe Plug 11 Actuator upper casing 13 Spring 14 Sleeve 15 O ring 16 Screw 17 O ring 18 Inlet plate 19 Outlet plate 20 Diaphragm 21 Screw 22 Washer 23 Nut 24 Screw 2...

Page 29: ...le 2 Seat 34 O ring Check Valve Figure 28 Key Description 159 Check valve 160 Male tube connector Type PRX Pilot Figure 25 Key Description 1 Adjusting screw 2 Locknut 3 Cap 4 O ring 5 O ring 6 Spring carrier plate 7 Spring 8 Spring cover 9 Spring carrier plate 10 Screw 11 Washer 12 Filter 13 Diaphragm plate 14 Diaphragm 15 Diaphragm plate 16 Body 17 O ring 18 O ring 19 Orifice 20 Nut 21 Lower cove...

Page 30: ... 8 4 44 13 14 15 16 17 18 19 20 35 DN 25 50 139 192 140 142 143 141 145 144 138 6 35 10 33 R102 Types EZH and EZHSO Europe Middle East and Africa Only Figure 16 Type EZH Main Valve Assembly DN 25 50 and 80 TRAVEL INDICATOR DETAIL TYPE EZH DN 25 VERSION ONLY TYPE EZH DN 80 VERSION ONLY ...

Page 31: ...2 31 30 29 27 3 10 21 20 19 18 17 16 15 75 74 77 69 72 73 70 35 83 10 14 13 44 12 192 139 140 141 143 144 145 142 138 71 67 66 68 23 R103 Types EZH and EZHSO Europe Middle East and Africa Only Figure 17 Type EZH Main Valve Assembly DN 100 TRAVEL INDICATOR DETAIL ...

Page 32: ...160 143 145 L2 L2 S2 34 197 198 2 L2 L2 ERAA01010_AA Types EZH and EZHSO Europe Middle East and Africa Only Figure 18 Type EZH Main Valve Assembly DN 150 and 200 Apply Lubricant L Sealant S 1 L2 Silicone based or PTFE based grease S2 Anaerobic methacrylate sealant for threads S3 General purpose medium bond strength threadlocker 1 Lubricant and sealant must be selected such that they meet the tempe...

Page 33: ...5 7 8 8 8 8 4 9 9 150 148 138 139 192 140 147 155 142 143 141 145 144 146 147 151 193 153 149 154 152 Types EZH and EZHSO Europe Middle East and Africa Only Figure 19 Type EZHSO Main Valve Assembly DN 25 50 and 80 TRAVEL INDICATOR DETAIL TYPE EZHSO DN 25 VERSION ONLY TYPE EZHSO DN 80 VERSION ONLY ...

Page 34: ...75 15 16 17 18 19 20 21 22 23 27 3 29 30 34 61 13 63 64 10 11 44 71 83 35 14 12 10 8 9 9 8 8 8 1 2 7 5 6 8 8 10 69 154 152 149 150 157 157 158 148 Types EZH and EZHSO Europe Middle East and Africa Only Figure 20 Type EZHSO Main Valve Assembly DN 100 TRAVEL INDICATOR DETAIL ...

Page 35: ...157 L2 193 147 151 153 L2 10 69 83 75 138 44 144 194 194 142 145 141 143 139 71 140 S2 L2 L2 L2 L2 ERAA24194_02 Types EZH and EZHSO Europe Middle East and Africa Only Figure 21 Type EZH Main Valve Assembly DN 150 and 200 FOR DN 200 ONLY Apply Lubricant L Sealant S 1 L2 Silicone based or PTFE based grease 1 Lubricant and sealant must be selected such that they meet the temperature requirements ...

Page 36: ...36 R123 51 55 57 50 49 46 54 56 48 53 52 47 BMS 46 6 4 3 2 1 5 Types EZH and EZHSO Europe Middle East and Africa Only Figure 22 Type EZH OS2 Slam Shut Version Figure 23 Type EZH X Body ...

Page 37: ...37 161 2 34 Types EZH and EZHSO Europe Middle East and Africa Only Figure 24 Type EZH Silencer Detail ...

Page 38: ...1 26 25 32 28 30 31 30 29 28 27 L S B 28 S L 34 31 30 D 29 B 28 27 32 R106 R107 R108 R109 Types EZH and EZHSO Europe Middle East and Africa Only Figure 25 Types PRX 120 and PRX 125 Pilots TYPE PRX 120 OR PRX 125 TYPE PRX 120 OR PRX 120 AP TYPE PRX 120 AP OR PRX 125 AP TYPE PRX 125 OR PRX 125 AP ...

Page 39: ...M 14 15 16 17 R 18 V 19 20 21 A A 4 H 1 2 3 4 5 6 7 8 9 10 11 12 13 M 14 15 16 17 R 18 V 19 20 21 A A R110 R111 Types EZH and EZHSO Europe Middle East and Africa Only Figure 27 Type RPE Pilot Heater Figure 28 Check Valve Figure 26 Type SA 2 Assembly ...

Page 40: ... 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 on request We reserve the right to modify or improve the designs or specifications of our products at any time without notice Emerson Process Management Regulator Technologies Inc doe...

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