Instruction manual

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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

Summary of content (8 pages)

PAGE 1
Type 122A Instruction Manual Form 2279 March 2013 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, fire 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.
PAGE 2
Type 122A Specifications The Specifications section lists the specifications for Type 122A three-way switching valve. Factory specification is stamped on the nameplate fastened on the valve at the factory. Maximum Inlet Pressure(1) 150 psig / 10.3 bar Flow Coefficients Cg(2) Connection A to B: 138 Connection A to C: 131 Set Pressure Ranges(1) See Table 1 Maximum Control Pressure to Diaphragm(1) 150 psig / 10.3 bar C1 Connection A to B: 28.0 Connection A to C: 32.
PAGE 3
Type 122A ADJUSTING SCREW SPRING STEM DIAPHRAGM PORT D UPPER VALVE SEAT PORT A PORT C VALVE LOWER VAVE SEAT W0157 INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE INLET PRESSURE INLET PRESSURE PORT B OUTLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE ATMOSPHERIC PRESSURE Figure 2.
PAGE 4
Type 122A Installation ! ! WARNING To avoid personal injury or equipment damage caused by bursting of pressure-retaining parts or explosion of accumulated gas, do not exceed the pressure or temperature limits in Specifications, and do not use the Type 122A valve for installations where water hammer can be experienced. 1. The switching valve may be installed in any position. Position the vent (key 29, Figure 3) so that the vent opening is facing downward.
PAGE 5
Type 122A Disassembly 1. Loosen the locknut (key 30). Rotate the adjusting screw (key 7) counterclockwise until all compression has been relieved from the spring (key 3). 2. Disconnect piping from the bottom connector (key 36). Unscrew and remove the bottom connector. 3. To remove the lower seat ring (key 37), insert a hexagonal bar into the seat ring hole, and use the bar to unscrew the seat ring. The hexagonal hole in the seat ring is 7/16-inch / 11 mm across the flats. 4.
PAGE 6
Type 122A Parts List Key Description Part Number 1 Spring Case, Aluminum 2P901508012 2 Lower Diaphragm Case, Cast iron 2L918419012 3 Spring See Table 1 4 Hex Nut, Plated steel (12 required) 1A3915X0022 5* 1R177435162 Stem, 316 Stainless steel 6 Spring Guide, Plated steel 1D666625072 7 Adjusting Screw, Plated steel 1D995448702 8 Diaphragm Plate, Plated steel 1D666428982 9* Diaphragm, Neoprene (CR) 1D666302102 10 Key 20
PAGE 7
Type 122A 7 30 1 31 3 28 5 4 29 8 9 4 10 15 12 14 13 13 2 20 19 21 A 24 C 6 26 16 12 17 18 22 23 37 25 36 B 20A9801-A A2606 Figure 3.
PAGE 8
Type 122A Industrial Regulators Natural Gas Technologies TESCOM Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Tescom Corporation USA - Headquarters McKinney, Texas 75069-1872, USA Tel: +1 800 558 5853 Outside U.S. +1 972 548 3574 USA - Headquarters McKinney, Texas 75069-1872, USA Tel: +1 800 558 5853 Outside U.S.