Type EZH
D103078X012
Instruction Manual
September 2013
www.fisherregulators.com
!
WARNING
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion and/or fi re
causing property damage and personal injury
or death.
Fisher
®
relief valve or backpressure regulator
must be installed, operated, and maintained
in accordance with federal, state, and local
codes, rules and regulations, and Emerson
Process Management Regulator Technologies,
Inc. (Regulator Technologies) instructions.
If the relief valve or backpressure 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 qualifi ed person must install or service
the relief valve or backpressure regulator.
Introduction
Scope of the Manual
This manual provides installation, startup and maintenance
instructions, and parts ordering information for theType EZH
relief valve or backpressure regulator and PRX Series pilots.
Information on other equipment used with this product is
found in separate manuals.
Product Description
Type EZH relief valve or backpressure regulator is pilot-
operated and designed for use in high pressure natural gas
transmission/city gate stations, large capacity distribution
systems, and power plant feeds.
Pilot Descriptions
The Type EZH relief valve or backpressure regulator
include a Type PRX/182 pilot mounted on the main valve.
PRX Series pressure reducing pilots have the ability to
handle a wide range of setpoints from 29 to 1160 psig /
2.0 to 80.0 bar.
Figure 1. Type EZH Regulator
Figure 2. PRX Series Pilot
TYPE PRX/182
Type EZH Relief or Backpressure Regulator
