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Instruction Manual
D103077X012
November 2017
EZH and EZHSO Series
Pressure Reducing Regulators
Figure 1. EZH Series Pressure Reducing Regulator
!
Failure to follow these instructions or to
properly install and maintain this equipment
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. (Emerson) 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.
the regulator.
WARNING
EZH and EZHSO Series
TYPE PRX/120
Figure 2. PRX Series Pressure Reducing Pilots
Introduction
Scope of the Manual
This manual provides installation, startup and maintenance
instructions and parts ordering information for the EZH and
EZHSO Series pressure-reducing regulators, PRX Series
on other equipment used with this regulator is found in
Product Description
EZH Series (Spring-to-Close) and EZHSO Series (Spring-
to-Open) regulators are accurate pilot-operated, pressure-
in high pressure natural gas transmission/city gate stations,
They provide smooth and reliable operation, tight shutoff and
TYPE PRX/120-AP
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Summary of Contents for Emerson EZH Series
- Page 1 EZH and EZHSO Series Pressure Reducing Regulators TYPE PRX/120 TYPE PRX/120-AP Figure 2. PRX Series Pressure Reducing Pilots Figure 1. EZH Series Pressure Reducing Regulator Introduction WARNING Scope of the Manual Failure to follow these instructions or to properly install and maintain this equipment...
- Page 2 EZH and EZHSO Series (1)(2) Minimum Differential Pressures Type EZH: Spring-to-close pilot-operated pressure MINIMUM DIFFERENTIAL reducing regulator for low to high outlet pressure MAIN VALVE For 100% Type EZHSO: Spring-to-open pilot-operated pressure BODY SIZE SERIES For 90% Capacity Capacity reducing regulator for low to high outlet pressure psid bar d psid...
- Page 3 1500 Table 2. Outlet Pressure Ranges OUTLET PRESSURE RANGE AC (ACCURACY CLASS) PILOT CONTROL SPRING INFORMATION TYPE Wire Diameter Free Length psig EZH Series EZHSO Series Spring Color Part Number Yellow 23 to 44 Green 41 to 80 PRX/120 PRX/125...
- Page 4 EZH and EZHSO Series TYPE PRX PILOT CONTROL FILTER SPRING PILOT UPPER TYPE SA2 DIAPHRAGM PILOT BLEED RESTRICTION PILOT DISK PILOT LOWER DIAPHRAGM REGULATOR ACTUATOR DIAPHRAGM CHECK VALVE MAIN VALVE DISK (PLUG) TYPE EZH INLET PRESSURE TYPE PRX: OUTLET PRESSURE TYPE SA/2: S - BLEED PORT ATMOSPHERIC PRESSURE...
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Page 5: Principle Of Operation
When outlet pressure drops below the setting of the pilot control spring, pilot control spring force on the pilot EZH Series (Figure 3) uses inlet pressure, which is reduced diaphragm opens the pilot valve disk, providing additional through pilot operation to load the regulator actuator... -
Page 6: All Installations
EZH and EZHSO Series The decision to use either an upstream or downstream the installation is in compliance with all monitoring system is largely a matter of personal preference applicable codes and regulations. Additionally, physical damage to the regulator could break the pilot off the main valve, causing personal injury a higher outlet pressure setting, the monitor regulator senses and property damage due to bursting of... - Page 7 EZH and EZHSO Series TYPE PRX TYPE PRX TYPE PRX TYPE PRX TYPE SA/2 TYPE SA/2 TYPE SA/2 TYPE SA/2 CHECK VALVE CHECK VALVE TYPE EZH TYPE EZH TYPE EZHO TYPE EZHO INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE TYPE PRX S - BLEED PORT TYPE SA/2: LOADING PRESSURE...
- Page 8 EZH and EZHSO Series TYPE PRX/120 TYPE PRX/125 TYPE PRX/120 TYPE SA/2 TYPE SA/2 CHECK CHECK VALVE VALVE TYPE EZH TYPE EZH INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE TYPE PRX S - BLEED PORT TYPE SA/2: LOADING PRESSURE B - SUPPLY PORT V - SENSING PORT INTERMEDIATE PRESSURE L - LOADING PORT...
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Page 9: Startup And Adjustment
(Figure 13), loosen locknut (key 2) and turn the adjusting 4. EZHSO Series Monitor Installations and all screw into the spring case (clockwise) to increase and EZH Series Installations: Crack open the outlet block out of the spring case (counterclockwise) to decrease the For EZHSO Series Single Regulator Installation:... -
Page 10: Maintenance
(Refer to Figures 8 and 9) Slowly close the valves in the following order: Carefully lift the upper actuator casing and lower actuator casing assembly (keys 11 and 5) off the For EZH Series: Remove the hex socket cap screws... - Page 11 (key 32 on EZH Series and key 154 on Lightly lubricate O-ring before placing in the sleeve For EZH Series: Lift off the disk retainer (key 31) and Remove the cage (key 3), seat ring (key 2) and O-ring...
- Page 12 EZH and EZHSO Series Table 4. TORQUE SPECIFICATIONS AND TOOL RECOMMENDATIONS Body Size PART NAME NPS 6, 8, and 12 X 6 / NPS 1 / DN 25 NPS 2 / DN 50 NPS 3 / DN 80 NPS 4 / DN 100 DN 150, 200 and 300 X 150 Tool Size mm Allen...
- Page 13 For EZHSO Series: Place the disk holder assembly inlet plate (key 18) and the diaphragm (key 20) on the For EZH Series: Loosen out the hex nuts (key 23) and remove the washers (key 22) and the cap screws Note...
- Page 14 EZH and EZHSO Series Actuator Assembly Maintenance NPS 4, 6, 8, 12 X 6 / DN 100, 150, 200, 300 X 150 (Refer to Figures 8 and 9) Lubricate the sleeve (key 14) in the upper plate contact area and assemble the diaphragm/plates assembly on For EZHSO Series: Remove Remove hex head cap screws (key 21), washers upper actuator casing (key 11) off the lower actuator...
- Page 15 (key 1) until compression is removed from the spring. Lower Diaphragm Maintenance EZH Series Travel Indicator Maintenance A new and improved travel indicator has been phased Remove machine screws (key 10) from lower cover (key 21) and the separate lower cover from the body...
- Page 16 EZH and EZHSO Series Remove remaining loose components: washer (key 11), Note upper diaphragm plate (key 13), diaphragm (key 14), When using a Type PRX/120 pilot with a lower diaphragm plate (key 15) and O-rings (keys 18 Type PRX/125 pilot as a monitor, use the following settings: Restrictor - completely tighten and then back out three full turns.
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Page 17: Parts Ordering
EZH and EZHSO Series Parts Ordering Description Part Number EZH Series Each EZH or EZHSO Series regulator is assigned a serial When ordering replacement parts, reference the key number of each needed part as found in the following parts REZH1X00N22... - Page 18 Anti-Friction Rings (4 required), PTFE 8 required for EZH Series, (10 required for EZH Series, EZH Series EZHSO Series for EZH Series, 3 required for EZHSO Series) Cage, Steel Pipe Plug, NPS 1, 2 and 3 / (standard) GE31405X012 Actuator Upper Casing, Carbon steel...
- Page 19 NPS 2 NPS 3 NPS 4 EZH Series EZHSO Series Cap Screw, Zinc-plated steel (14 required for EZH Series, (14 required for EZH Series, (14 required for EZH Series, EZH Series Plain Washer, Steel Hex Nut, Zinc-plated carbon steel Polyurethane (PU)
- Page 20 LEGACY TRAVEL INDICATOR DETAIL IMPROVED TRAVEL INDICATOR DETAIL APPLY LUBRICANT (L) / SEALANT (S) L2 = SILICONE-BASED OR PTFE-BASED GREASE S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS Figure 7. EZH Series Travel Indicator Assembly Description Part Number Description Part Number...
- Page 21 Part Number Description Part Number EZH Series Lower Spring Seat, EZH Series only, Carbon steel Caution/Warning Label, Aluminum - - - - - - - - - - - - - - - - - - - - - -...
- Page 22 EZH and EZHSO Series Description Part Number (with standard body or tapped inlet body) 154* Hex Socket Cap Screw, Stainless steel EZHSO Series only (1 required) Description Part Number FA402505X12 150, 300 X 150 and 200, 1 required) Stem Nut Tube Elbow (NPS 1, 2 and 3 / - - - - - - - - - - - (EZHSO Series only), Steel...
- Page 23 EZH and EZHSO Series Pre-Piped Pilot Supply and Pilot Exhaust Working Description Part Number Lower Cover O-ring (2 required) (with tapped inlet and outlet body) Description Part Number Polyurethane (PU) ERAA11220A0 Tube Elbow (NPS 1, 2 and 3 / Nameplate - - - - - - - - - - - Stem O-ring Tubing...
- Page 24 NPS 6, 12 X 6 and 8 / DN 150, 300 X 150 and 200 EZHSO Series For Polyurethane (PU) EZH Series - - - - - - - - - - - - - - - - - - - - - -...
- Page 25 APPLY LUBRICANT (L) / SEALANT (S) L1 = LITHIUM HYDROXYSTEGRATE NLGI 2 GRADE GREASE L2 = SILICONE-BASED OR PTFE-BASED GREASE S1 = ANAEROBIC METHACRYLATE SEALANT FOR NUTS AND BOLTS S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS Figure 8. EZH Series Main Valve Assembly...
- Page 26 EZH and EZHSO Series NPS 1 THROUGH 3 / DN 25 THROUGH 80 NPS 4 / DN 100 Figure 8. EZH Series Main Valve Assembly (continued)
- Page 27 APPLY LUBRICANT (L) / SEALANT (S) L1 = LITHIUM HYDROXYSTEGRATE NLGI 2 GRADE GREASE L2 = SILICONE-BASED OR PTFE-BASED GREASE S1 = ANAEROBIC METHACRYLATE SEALANT FOR NUTS AND BOLTS S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS Figure 8. EZH Series Main Valve Assembly (continued)
- Page 28 NPS 6, 8, 12 X 6 / DN 150, 200, 300 X 150 APPLY LUBRICANT (L) / SEALANT (S) L2 = SILICONE-BASED OR PTFE-BASED GREASE S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS S3 = GENERAL PURPOSE MEDIUM BOND STRENGTH THREADLOCKER Figure 8. EZH Series Main Valve Assembly (continued)
- Page 29 FOR NPS 1 / DN 25 FOR NPS 3 / DN 80 INDICATOR DETAIL TRAVEL INDICATOR DETAIL EZH SERIES VERSION ONLY EZH SERIES VERSION ONLY NPS 1 THROUGH 3 / DN 25 THROUGH 80 APPLY LUBRICANT (L) / SEALANT (S)
- Page 30 EZH and EZHSO Series TRAVEL INDICATOR DETAIL 142B NPS 4 / DN 100 APPLY LUBRICANT (L) / SEALANT (S) L1 = LITHIUM HYDROXYSTEGRATE NLGI 2 GRADE GREASE L2 = SILICONE-BASED OR PTFE-BASED GREASE S1 = ANAEROBIC METHACRYLATE SEALANT FOR NUTS AND BOLTS S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS Figure 9.
- Page 31 EZH and EZHSO Series NPS 6, 8, 12 X 6 / DN 150, 200, 300 X 150 FOR NPS 8 / DN 200 ONLY APPLY LUBRICANT (L) / SEALANT (S) L2 = SILICONE-BASED OR PTFE-BASED GREASE S2 = ANAEROBIC METHACRYLATE SEALANT FOR THREADS Figure 9.
- Page 32 EZH and EZHSO Series TYPE SA/2 “L” PORT “B” PORT TYPE PRX/120-AP BACK CHECK VALVE VIEW: A-A NPS 1 THROUGH 3 / DN 25 THROUGH 80 Figure 10. EZH Series Single Pilot Mounting Assembly...
- Page 33 NPS 4 / DN 100 “L” PORT TYPE SA/2 TYPE PRX/120-AP “B” PORT BACK CHECK VALVE NPS 4, 6, 12 X 6 AND 8 / DN 100, 150, 300 X 150 AND 200 Figure 10. EZH Series Single Pilot Mounting Assembly (continued)
- Page 34 EZH and EZHSO Series TYPE SA/2 “L” PORT “B” PORT TYPE PRX/120-AP BACK CHECK VALVE VIEW: A-A NPS 1 THROUGH 3 / DN 25 THROUGH 80 Figure 11. EZH Series Working Monitor Pilot Mounting Assembly...
- Page 35 NPS 4 / DN 100 TYPE SA/2 BACK CHECK VALVE TYPE PRX/120-AP BACK CHECK VALVE NPS 4, 6, 12 X 6 AND 8 / DN 100, 150, 300 X 150 AND 200 Figure 11. EZH Series Working Monitor Pilot Mounting Assembly (continued)
- Page 36 EZH and EZHSO Series “L” PORT TYPE PRX/120 TYPE SA/2 “B” PORT BACK CHECK VALVE “A” PORT NPS 1 THROUGH 3 / DN 25 THROUGH 80 Figure 12. EZHSO Series Single Pilot Mounting Assembly...
- Page 37 EZH and EZHSO Series EZH SERIES NPS 4 / DN 100 “L” PORT TYPE SA/2 TYPE PRX/120-AP “B” PORT BACK CHECK VALVE NPS 4, 6, 12 X 6 AND 8 / DN 100, 150, 300 X 150 AND 200 Figure 12. EZHSO Series Single Pilot Mounting Assembly (continued)
- Page 38 EZH and EZHSO Series TYPE PRX/120-AP OR PRX/125-AP TYPE PRX/120 OR PRX/125 TYPE PRX/125 OR PRX/125-AP TYPE PRX/120 OR PRX/120-AP S - BLEED PORT B - SUPPLY PORT L - LOADING PORT A - SENSING PORT D - DAMPER R - RESTRICTOR Figure 13.
- Page 39 EZH and EZHSO Series HOT WATER INLET/OUTLET HOT WATER INLET/OUTLET SENSING PORT OUTLET PORT INLET PORT Figure 14. Type SA/2 Pilot Supply Filter Assemblies...
- Page 40 Technologies, Inc. All rights reserved. 11/17. Emerson Automation Solutions The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher™ is a mark owned by Fisher Controls International LLC, a Americas business of Emerson Automation Solutions.