Emerson 122A Instruction Manual download pdf

Type 122A

D100263X012

March 2013

Instruction Manual

Form 2279

www.fisherregulators.com

Type 122A Three-Way Switching Valve

WARNING

Failure to follow these instructions or

to properly install and maintain this

equipment could result in an explosion,

 re and/or chemical contamination

causing property damage and personal

injury or death.

Fisher

switching valves 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 switching valve 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.

Installation, operation, and maintenance

procedures performed by unquali ed

personnel may result in improper

adjustment and unsafe operation. Either

condition may result in equipment

damage or personal injury. Only

quali ed personnel shall install, operate,

and maintain the Type 122A three-way

switching valve.

Introduction

Scope of the Manual

This instruction manual includes installation,

adjustment, maintenance, and parts ordering

information for the Type 122A three-way

switching valve.

Description

The Type 122A three-way switching valve (see

Figure 1) is a high-capacity, economical three-way

pneumatic switching valve for on-off applications. This

valve can be used for diverging or converging gaseous

service, diverging liquid service with gas-loaded

liquids, and converging liquid service. Six spring

ranges are available for control pressures from 3 to

150 psig / 0.21 to 10.3 bar.

Figure 1. Type 122A Three-Way Switching Valve

W3141-1

1 2 3 4 5 6 7 8

Type 122A 1

Summary of Contents

Page 1 - Type 122A

Type 122A D100263X012March 2013Instruction ManualForm 2279www.fisherregulators.comType 122A Three-Way Switching Valve!WARNINGFailure to follow these i

Page 2

Type 122A2SpecicationsThe Specications section lists the specications for Type 122A three-way switching valve. Factory specication is stamped on

Page 3

Type 122A3Figure 2. Type 122A Three-Way Switching Valve Operational SchematicINLET PRESSUREOUTLET PRESSUREATMOSPHERIC PRESSUREW0157INLET PRESSUREOUTL

Page 4

Type 122A4Installation!WARNINGTo avoid personal injury or equipment damage caused by bursting of pressure-retaining parts or explosion of accumulated

Page 5

Type 122A5Disassembly1. Loosen the locknut (key 30). Rotate the adjusting screw (key 7) counterclockwise until all compression has been relieved fro

Page 6

Type 122A6Parts ListKey Description Part Number 1 Spring Case, Aluminum 2P901508012 2 Lower Diaphragm Case, Cast iron 2L918419012

Page 7

Type 122A7Figure 3. Type 122A Three-Way Switching Valve Assembly20A9801-AA2606 7 1 3 5 29 9 12 10 13 15 2 19 24 37 36 23 22 18 21 17 13 12 14

Page 8

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Emerson 122A Instruction Manual

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