Table of Contents
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Instruction Manual
D103680X012
May 2016
Types EZH and EZHSO Pressure Reducing Regulators
Contents
Introduction .............................................................. 2
Characteristics ......................................................... 3
Labelling .................................................................. 5
Dimensions and Weights ......................................... 6
Description ............................................................... 8
Principle of Operation ............................................... 8
Monitoring Systems .................................................. 11
Installation ............................................................... 13
Startup and Adjustment ........................................... 15
Shutdown ................................................................. 17
Maintenance ............................................................ 17
Troubleshooting ....................................................... 24
Spare Parts .............................................................. 25
Parts List .................................................................. 26
WaRning
!
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.
Types EZH and EZHSO
Figure 1. Type EZH Pressure Reducing Regulator
Figure 2. PRX Series Pressure Reducing Pilots
Types EZH, EZHSO, EZH OS2 and EZHSO OS2
PED 2014/68/EU and are classified in Category IV.
www.fisherregulators.com
TYPE PRX-120
TYPE PRX-120/aP
regulators are in conformity with the
Pressure Equipment Directive
R94
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Summary of Contents for Fisher EZH
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Page 1: Table Of Contents
Failure to correct trouble Types EZH, EZHSO, EZH OS2 and EZHSO OS2 could result in a hazardous condition. regulators are in conformity with the... -
Page 2: Introduction
This manual provides installation, startup, maintenance the working pilot in wide-open monitor systems. and parts ordering information for the Types EZH and • Type PRX/120-AP: EZHSO pressure-reducing regulators and Type PRX pilot Outlet pressure range of 30 to 80 bar. -
Page 3: Characteristics
30.0 to 80.0 2.5% Clear PRX/125-AP Table 3a. 2:1 Line Flow Coefficients, Regulator and Slam-Shut Travel TYPES EZH (Dn 25 - 100) anD EZHSO (Dn 25 - 100) WiTH SlaM SHuT (X BODY) WiTHOuT SlaM SHuT (E BODY) REDuCTiOn Dn 25... - Page 4 Types EZH and EZHSO Table 3b. 2:1 Line Flow Coefficients, Regulator with Integrated Whisper III Silencer TYPES EZH (Dn 25 - 100) WiTH WHiSPER iii anD EZHSO (Dn 25 - 100) WiTH WHiSPER iii SlaM SHuT inTEgRaTED (X BODY) WiTHOuT SlaM SHuT (E BODY)
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Page 5: Labelling
Depending on BMS configuration CLASS 150 300 600 16B 25B Pumax 18.9 79 158 18.9 Figure 3. Types EZH OS2 and EZHSO OS2 Label (X Body) CL150 RF CL300 RF CL600 RF PN16B PN25B PN40B Failure mode FC FO Other configurations available (contact factory) -
Page 6: Dimensions And Weights
Mechanism box Mechanism box removal clearance removal clearance R112a Figure 5. Dimensions — Types EZH OS2 and EZHSO OS2 (Horizontal Position) Dn 25, 50, 80 and 100 Table 5. Approximate Regulator Weights Types EZH OS2 and EZHSO OS2 WEigHTS, kg... - Page 7 Indicator cover removal clearance removal clearance removal clearance R115a Figure 7. Dimensions — Types EZH and EZHSO (Horizontal Position) Dn 25, 50, 80 and 100 Table 7. Approximate Regulator Weights Types EZH and EZHSO WEigHTS, kg CL150/PN 16B...
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Page 8: Description
OUTLET PRESSURE (Pd) a - SEnSing PORT M - inlET ATMOSPHERIC PRESSURE (Pb) Figure 9. Type EZH DN 25/50/80 (Spring-to-Close Version) Operational Schematic Description Principle of Operation The Types EZH and EZHSO regulators consist of: Type EZH — Spring-to-Close version •... - Page 9 (see Table 4 for For Type EZH DN 100 a check valve (Figure 26) is Failure Mode analysis). installed between outlet pressure and motorization pressure impulse lines; this valve will protect the...
- Page 10 3 bar. This pressure opposes the motorization pressure. main spring force that tends to open the regulator. EZH and EZHSO Series adjustment Outlet or downstream pressure (Pd) opposes the pilot control spring. When outlet pressure drops below the...
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Page 11: Monitoring Systems
During an overpressure situation, the monitoring system keeps the customer on line. Figure 13 shows an upstream wide-open monitor Type EZH (Spring-to-Close) and a downstream active Also testing is relatively easy and safe. To perform a regulator Type EZHSO (Spring-to-Open). With this... - Page 12 In this PRX/125-AP monitoring pilot for the upstream way, both units are always operating and can be easily regulator and a Type EZH or EZHSO with the checked for proper operation. appropriate Type PRX/120 or PRX/120-AP pilot for the downstream regulator.
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Page 13: Installation
- SEnSing PORT M - inlET ATMOSPHERIC PRESSURE (Pb) Figure 14. Working Monitoring System Operational Schematic with Two EZH (Spring-to-Close) for DN 25, 50 and 80 the schematic remains the same with the remark that To avoid such injury and damage, install a check valve (Figure 26) must be installed between the regulator in a safe location. - Page 14 Monitor Systems) in the case of functioning class B for the slam shut it is necessary to A Type EZH or EZHSO regulator bleeds no gas to regularly check the safety manometric atmosphere during normal operation, thus making box (BMS) diaphragm.
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Page 15: Startup And Adjustment
(see Figure 13). Type EZH OS2 Slam-shut version 2. Connect the pilot supply line for the downstream regulator to the outlet "R" port of the Type SA/2 In the case of opening the mechanism box lid: pilot supply filter regulator. - Page 16 Types EZH and EZHSO 3. Introduce upstream pressure by slowly opening à Progressively increase the pressure until inlet valve. tripping occurs à Adjust setting if necessary (D103683X012). Note 4. Slowly open valve R2. the set point value on the equipment or mark it on a 5.
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Page 17: Shutdown
O-ring (key 34). Inspect the O-ring for damage or wear and replace if necessary. Lightly lubricate O-ring For both Types EZH and EZHSO DN 100, never before placing in the body (key 1). remove or disconnect the check valve installed between the two casings. - Page 18 Torque Specification table for proper torque. Rotate the cap such that the outer holes for sensing lines are in line with upper Disk Maintenance Type EZH DN 100 casing holes for sensing lines: to validate (Figure 17) the alignment and before attaching cap, check that travel indicator is aligned on 1.
- Page 19 O-rings and split rings; replace with new parts. Lightly lubricate the O-ring and split rings. Place Types EZH and EZHSO (DN 25, 50 and 80) the split rings in the body first, then slide the O-ring between the split rings.
- Page 20 Types EZH and EZHSO 14. Lightly lubricate the O-rings (keys 15 and 17) and the 6. Inspect the upper actuator casing (key 11), O-ring inner and outer diaphragm (key 20) edges. Place the (key 9), anti-friction split rings (key 8) and anti-friction inlet plate (key 18) and the diaphragm (key 20) on the ring (key 4) for damage or wear.
- Page 21 Types EZH and EZHSO Type EZH DN 100 Actuator Assembly note Maintenance (Figure 17) Rotate the upper casing such that the outer holes for sensing lines are 1. Remove travel indicator assembly (keys 71, 138, 139, perpendicular to gas flow.
- Page 22 10. Place cage (key 78) on the top of seat ring (key 2). 11. Place lower casing (key 5) on top of body. Replace Type EZH OS2 Regulator with washer (key 67) and tighten bolts (key 6). Screw Slam-shut Maintenance (Figure 20) sleeve guide into lower casing (key 5) utilizing cap (key 70).
- Page 23 Types EZH and EZHSO 2. Remove screws (key 10) from lower cover (key 21) 9. Set the upper diaphragm plate (key 13) on top of the and the separate lower cover from the body (key 16). diaphragm (key 14). 3. Use a wrench to hold the stem (key 23) and break 10.
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Page 24: Troubleshooting
Starting positions: care to avoid damage to parts when reassembling. • Inlet valve à Open 10. Set the spring (key 1, version Type EZH spring • Outlet valve à Open diameter 3, on top of the nut (key 21). • Slam-shut valve plug à Open 11. -
Page 25: Spare Parts
Types EZH and EZHSO Table 10. Torque Specifications SCREW SCREW SCREW SCREW (Key 21 - Figures 16, 17, 18 and 19) (Key 24 - Figures 16 and 18) (Key 6 - Figures 16, 17, 18 and 19) (Key 50 - Figure 20) (Key 1 - Figure 21) -
Page 26: Parts List
Types EZH and EZHSO Parts list Type eZHSO (Figures 18 and 19) Type eZH (Figures 16, 17, 18 and 19) Description Description Protective cap Body Stem Seat Upper spring axe Cage Lower spring axe Anti-friction ring 150* Anti-friction ring Actuator lower casing... - Page 27 Types EZH and EZHSO Réduction 0 Réduction 1 Réduction 2 Réduction 3 TRavEl inDiCaTOR DETail TYPE EZH Dn 25 vERSiOn OnlY TYPE EZH Dn 80 vERSiOn OnlY DN 25-50 R102 Figure 16. Type EZH Main Valve Assembly (DN 25, 50 and 80)
- Page 28 Types EZH and EZHSO TRavEl inDiCaTOR DETail R103 Figure 17. Type EZH Main Valve Assembly (DN 100)
- Page 29 Types EZH and EZHSO TRavEl inDiCaTOR DETail TYPE EZHSO Dn 25 vERSiOn OnlY TYPE EZHSO Dn 80 vERSiOn OnlY 147 151 193 153 R102c Figure 18. Type EZHSO Main Valve Assembly (DN 25, 50 and 80)
- Page 30 Types EZH and EZHSO TRavEl inDiCaTOR DETail Figure 19. Type EZHSO Main Valve Assembly (DN 100)
- Page 31 Types EZH and EZHSO Figure 20. Type EZH OS2 (Slam-Shut Version) R123 Figure 21. Type EZH "X Body"...
- Page 32 Types EZH and EZHSO Figure 22. Type EZH Silencer Detail...
- Page 33 Types EZH and EZHSO R107 TYPE PRX/120-aP OR PRX/125-aP R106 TYPE PRX/120 OR PRX/125 R108 R109 TYPE PRX/120 OR PRX/120-aP TYPE PRX/125 OR PRX/125-aP Figure 23. Types PRX/120 and PRX/125 Pilots...
- Page 34 Types EZH and EZHSO Type PRX Pilot (Figure 23) Description Adjusting screw Locknut O-ring O-ring Spring carrier plate Spring Spring cover Spring carrier plate Screw Washer Filter Diaphragm plate Diaphragm Diaphragm plate R110 Body O-ring O-ring Orifice Lower cover Diaphragm plate...
- Page 35 Types EZH and EZHSO Figure 25. Type RPE Pilot Heater Figure 26. Check Valve...
- Page 36 Types EZH and EZHSO Industrial Regulators Natural Gas Technologies TESCOM Emerson Process Management Emerson Process Management Emerson Process Management Regulator Technologies, Inc. Regulator Technologies, Inc. Tescom Corporation USA - Headquarters USA - Headquarters USA - Headquarters McKinney, Texas 75070 USA...
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