Emerson Fisher 122A Series Instruction Manual

Emerson Fisher 122A Series Instruction Manual

Three-way switching valve

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Instruction Manual
Form 2279
January 2016
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. 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 unqualified
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only
qualified 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.
W3141-1
Figure 1. 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.
www.fisherregulators.com
Type 122A

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Summary of Contents for Emerson Fisher 122A Series

  • Page 1 ® 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 switching valve vents gas or a leak develops in the system, service to the unit may be required.
  • 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 Flow Coefficients 150 psig / 10.3 bar Connection A to B: 138 Set Pressure Ranges Connection A to C: 131 See Table 1...
  • Page 3 Type 122A ADJUSTING SCREW SPRING STEM DIAPHRAGM PORT D UPPER VALVE SEAT PORT A PORT C VALVE LOWER VALVE SEAT PORT B INLET PRESSURE OUTLET PRESSURE A2606 ATMOSPHERIC PRESSURE INLET PRESSURE INLET PRESSURE OUTLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE ATMOSPHERIC PRESSURE Figure 2.
  • Page 4 Type 122A Installation WARNING To avoid personal injury, property WARNING damage or equipment damage caused by bursting of pressure containing To avoid personal injury or equipment parts or explosion of accumulated damage caused by bursting of gas, never adjust the control spring pressure-retaining parts or explosion to produce an outlet pressure higher of accumulated gas, do not exceed...
  • Page 5 Type 122A Disassembly 3. Install the washer (key 17) and three felt washers (key 18) into the valve end of the diaphragm case. 1. Loosen the locknut (key 30). Rotate the adjusting Replace the guide bushings (key 15) in each end screw (key 7) counterclockwise until all compression of the diaphragm casing.
  • Page 6 Type 122A Parts List Description Part Number Description Part Number Spring Case, Snap Ring, Plated steel 1A832648722 Aluminum 2P901508012 Body Gasket, Lower Diaphragm Case, Composition 1A832504032 Cast iron 2L918419012 22* Disk Holder Assembly Spring See Table 1 Aluminum/Nitrile (NBR) 1R1772000A2 Stainless steel/Nitrile (NBR) 1R1772X00A2 Hex Nut, Plated steel...
  • Page 7 Type 122A 20A9801-A Figure 3. Type 122A Three-Way Switching Valve Assembly...
  • Page 8 For further information visit www.fisherregulators.com The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls International LLC, a business of Emerson Process Management.

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