Emerson EZH and EZHSO Series Pressure Reducing Regulators Ficha de datos descargar pdf (Pagina 2)

Bulletin 71.4:EZH

Specications

Ratings and specications for the Type EZH are listed in the Specications section below. Specications for specic relief

valve or backpressure regulator constructions are stamped on a nameplate attached to either the main actuator or the pilot

spring case.

Available Congurations

Type EZH: Pilot-operated relief or backpressure

regulator for low to high outlet pressure

Body Sizes, End Connection Styles and

Pressure Ratings

(1)

See Table 1

Maximum Allowable Pressures

(1)

Inlet Pressure: 1500 psig / 103 bar

Outlet (Casing) Pressure: 1500 psig / 103 bar

Emergency Casing Pressure: 1500 psig / 103 bar

Minimum Buildup Pressure

Main Valve: 1500 psid / 103 bar d

Pilot (Between loading pressure in pilot and

loading sense pressure): 1233 psid / 85.0 bar d

Minimum Differential Pressures

See Table 3

Relief Set Pressure Ranges

See Table 2

Flow and Sizing Coefcients

See Tables 5 and 6

Flow Capacities

See Table 7

Pilot and Filter-Regulator Flow Coefcients

Type PRX Pilot: C

: 10.5; C

: 0.36; C

: 29

Pressure Registration

External

Pilot Connections

1/4 NPT

Temperature Capabilities

(1)

Nitrile (NBR) Version:

-20 to 180ºF / -29 to 82ºC

Fluorocarbon (FKM) Version:

0 to 180ºF / -18 to 82ºC

(2)

Option

• Travel Indicator

Construction Materials

Main Valve

Main Valve Body:

Type EZH: WCC Steel

Intermediate Flange and Actuator Casings:

Steel, ASTM A350 LF2

Diaphragm Plates: Steel, ASTM A105

Diaphragm: Nitrile (NBR) with PVC coating

O-rings: Fluorocarbon (FKM)

Disk: Nitrile (NBR) or Fluorocarbon (FKM)

PRX Series Pilots

Body: Steel, ASTM 105

Trim: Stainless Steel

Elastomers: Nitrile (NBR) or Fluorocarbon (FKM)

Disk: Polyurethane (PU) or Fluorocarbon (FKM)

Approximate Weights

See Table 9

1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded.

2. Type PRX Fluorocarbon (FKM) elastomer is limited to 0°F / -18°C.

• Bubble Tight Shutoff—The Type EZH 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.

• In-Line Maintenance—Top entry design provides easier

maintenance. Trim parts can be inspected, cleaned and

replaced without removing the body from pipeline.

• Precise Pressure Control—The Type EZH use the

PRX Series pilot system to provide stable and accurate

pressure control.

• Full Pressure Rating—The Type EZH 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.

• O-ring Design—The Type EZH use elastomer

O-rings instead of gaskets, reducing maintenance and

assembly time.

Introduction

Type EZH is an accurate pilot-operated, pressure-balanced,

soft-seated relief valve or backpressure regulator. It is

designed for use in high pressure natural gas transmission/

city gate stations, large capacity distribution systems and

power plant feeds. It provides smooth and reliable operation,

tight shutoff and long life.

Pilot Descriptions

The Type EZH relief valve or backpressure regulator include

a Type PRX/182 pilot mounted on the EZH Series main

valves for relief valve or backpressure regulator applications.

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.

1 2 3 4 5 6 7 8

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