Emerson EZH and EZHSO Series Pressure Reducing Regulators Fiche technique télécharger pdf (Page 2)

Bulletin 71.2:EZH and EZHSO

2

Features

• Long Life in Severe Service Applications—The

EZH and EZHSO Series utilize a metal plug design

to deect particles and debris away from the soft-

seat, which gives enhanced resistance to particle

erosion to provide a longer service life. In addition,

the EZH and EZHSO Series can be constructed

with Fluorocarbon (FKM) soft parts to extend

service life in applications where liquid aromatics

are entrained in the gas.

• Main Diaphragm—The main diaphragm is

Nitrile (NBR) reinforced with fabric and coated

with a PVC, which protects and extends the service

life of the regulator in applications where the liquids

commonly found in natural gas pipelines tend to

shorten diaphragm life.

• Common Body Platform—The EZH and

EZHSO Series use the same standard Fisher

®

E-Body which is also used in Type EZR pressure

reducing regulator and Types EZ, ES, ED and ET

pressure reducing control valves. This will allow

easy conversion from one product to another

without the need to remove the E-Body from

the pipeline.

• Spring-to-Close and Spring-to-Open Versions—

Optional positions to choose from in case of main

valve diaphragm failure or lack of supply pressure

to the pilot.

• Bubble-Tight Shutoff—The EZH and

EZHSO Series have knife-edged, metal plug and a

soft seat which provide bubble tight shutoff for use

in applications where positive shutoff is required.

For example: dead-end systems.

• No Atmospheric Bleed—The EZH and

EZHSO Series eliminate nuisance and wasteful

bleed gas to atmosphere by utilizing a pilot-

operated two-path control system, which bleeds

100% of the gas to the downstream system

while the regulator is operating.

• High Turn Down Capability—The oversized

diaphragm and unique piloting system of the

EZH and EZHSO Series allow for high turn

down, which will provide superior pressure control

in systems with large variations in downstream

ow demand.

• In-Line Maintenance—Top entry design provides

easier maintenance. Trim parts can be inspected,

cleaned and replaced without removing the

body from pipeline.

• Noise Abatement Trim—The EZH and

EZHSO Series offer an optional Whisper Trim™

Cage which is integral to the regulator. Allows for a

noise attenuation of up to 8 dBA.

• Precise Pressure Control—The EZH and

EZHSO Series use the PRX Series and Type SA/2

pilot system to provide stable and accurate

downstream pressure control regardless of load

changes or inlet pressure variations.

• Full Pressure Rating—The EZH and EZHSO Series

have equal inlet and outlet pressure rating

of 1500 psig / 103 bar, which allows easier

selection and requires no special startup or

shutdown procedures.

• Full Usable Capacity—Fisher brand regulators

are laboratory tested. 100% of the published ow

capacity can be used with condence.

• Disk Design—The EZH and EZHSO Series offer

disks for the main body made from Nitrile (NBR),

Fluorocarbon (FKM) and Polyurethane (PU).

Polyurethane (PU) provides better abrasion

resistance properties and a high durometer rating

to extend the working life of the disk in difcult

applications where disk erosion is an issue.

• O-ring Design—The EZH and EZHSO Series use

elastomer O-rings instead of gaskets, reducing

maintenance and assembly time.

• Slam-Shut Protection—Types EZHOSX

and EZHSO-OSX discontinue gas service by

shutting the gas off if there is an overpressure or

underpressure condition.

Introduction

Types EZH (Spring-to-Close version) and EZHSO

(Spring-to-Open version) regulators are accurate pilot-

operated, pressure-balanced, soft-seated regulators.

They are designed for use in high pressure natural

gas transmission, city gate stations, large capacity

distribution systems and power plant feeds. They

provide smooth and reliable operation, tight shutoff

and long life.

For underpressure or overpressure protection, the

Types EZHOSX and EZHSO-OSX are available with

an integral slam-shut device to completely shut off the

ow of gas to the downstream system. The slam shut

has a mechanism box and a manometric device. The

manometric device is a spring and diaphragm actuator.

Its movement activates the detection stage of the

mechanism box. The shutoff is a two-stage process, the

detection stage and the power stage. This separation

between detection stage and power stage provides

maximum precision, alleviating many false trips caused by

environmental vibrations. The slam-shut device includes

a bypass valve that will allow pressure to be equalized

when resetting the device. Once the slam-shut device has

been tripped, it must be manually reset.

Emerson EZH and EZHSO Series Pressure Reducing Regulators Fiche technique Page 2

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Fiche technique Page 2

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