Fisher EZH User Manual

Europe, Middle East and Africa Document Only
Types EZH and EZHSO
Instruction Manual
D103680X012
May 2016
www.fisherregulators.com
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

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

or service the regulator.
Figure 1. Type EZH Pressure Reducing Regulator
R94
Figure 2. PRX Series Pressure Reducing Pilots
TYPE PRX-120/APTYPE PRX-120
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.

Fisher EZH Specifications

General

Manufacturer	Fisher
Category	Controller
Communication	HART
Enclosure Rating	NEMA 4X, IP66
Ambient Temperature Range	-40 to 85°C (-40 to 185°F)
Input Signal	4-20 mA

Summary

Introduction

Product Description

Explains the features and design of EZH/EZHSO regulators.

Pilot Description

Describes the PRX Series pilots and SA/2 filter regulator.

Actuator

Details the integrated pressure-type actuator.

Characteristics

OPERATING PRESSURE

Specifies pressure limits for body, actuator, valve, and pilot.

REGULATOR

Covers EN standard, inlet/outlet pressure, and differential.

Accuracy

Details accuracy classes (AC, SG, SZ).

SLAM SHUT

Provides information on slam shut operation and standards.

Fluid

Dimensions and Weights

Table 5. Approximate Regulator Weights

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

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

Figure 5. Dimensions - Types EZH OS2 and EZHSO OS2 (Horizontal Position)

Figure 6. Dimensions - Types EZH OS2 and EZHSO OS2 (Vertical Position)

Figure 7. Dimensions - Types EZH and EZHSO (Horizontal Position)

Figure 8. Dimensions - Types EZH and EZHSO (Vertical Position)

Table 7. Approximate Regulator Weights Types EZH and EZHSO

Table 8. Dimensions Types EZH and EZHSO

Principle of Operation

Type EZH - Spring-to-Close Version

Explains the operating principle of EZH Spring-to-Close.

Type EZH Single-Pilot Regulator (Figures 9 and 10)

Details the operational schematic for single-pilot EZH.

Type EZHSO - Spring-to-Open Version

Explains the operating principle of EZHSO Spring-to-Open.

Type EZHSO Single-Pilot Regulator (Figures 11 and 12)

Details the operational schematic for single-pilot EZHSO.

EZH and EZHSO Series Adjustment

Type PRX Pilot Adjustment

Guides on adjusting the Type PRX pilot.

Monitoring Systems

Wide-Open Monitoring Systems

Figure 13 shows an upstream wide-open monitor Type EZH (Spring-to-Close) and a downstream active regulator Type EZHSO (Spring-to-Open).

Describes a specific monitoring setup.

Working Monitor System with Type PRX Pilot (Figure 14)

Details working monitor systems with PRX pilots.

Installation

WARNING

Safety warning about overpressure and physical damage.

All Installations (Single Regulator or Monitor Systems)

General installation guidelines for all configurations.

Startup and Adjustment

Pre-startup Considerations

Lists checks before starting up the regulator.

Type EZH Startup

Step-by-step startup procedure for Type EZH.

Type EZHSO Startup

Step-by-step startup procedure for Type EZHSO.

For a single regulator

Adjustment procedure for single regulators.

For a wide-open downstream monitor installation

For a wide-open upstream monitor installation

For a working monitor installation

Type OS2 Manometric Box Set Point Verification Procedure

Shutdown

CAUTION

Caution about downstream system pressure during shutdown.

Maintenance

Main Valve and Actuator Maintenance

Covers maintenance of main valve and actuator components.

Disk Maintenance DN 25, 50 and 80 (Figure 16)

Maintenance steps for disk assembly DN 25, 50, 80.

Type EZH Disk Maintenance

Specific disk maintenance for Type EZH.

Type EZHSO Disk Maintenance

Specific disk maintenance for Type EZHSO.

Disk Maintenance Type EZH DN 100 (Figure 17)

Disk Maintenance Type EZHSO DN 100 (Figure 19)

Actuator Assembly Maintenance DN 25, 50 and 80

Type EZH Actuator Maintenance

Type EZHSO Actuator Maintenance

Type EZH DN 100 Actuator Assembly Maintenance (Figure 17)

Type EZHSO DN 100 Actuator Assembly Maintenance (Figure 19)

Type EZH OS2 Regulator with Slam-shut Maintenance (Figure 20)

Type PRX Pilot Maintenance (Figure 23)

Type SA/2 Pilot Supply Filter Regulator Maintenance (Figure 24)

Troubleshooting

Servicing Check

Tight shut-off verification (and tripping verification for versions with integral slam shut)

Table 9. Troubleshooting for Types EZH and EZHSO Regulators

Table listing symptoms, causes, and actions.