Emerson Fisher 122A Series User manual

Type 122A

D100263X012

January 2016

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. 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

Type 122A

Specications

The Specications section lists the specications for Type 122A three-way switching valve. Factory specication is

stamped on the nameplate fastened on the valve at the factory.

Table 1. Set Pressure Ranges

SET PRESSURE RANGES

PRESSURE BUILD-UP

ABOVE SETPOINT

REQUIRED FOR

FULL STROKE

SPRING

WIRE DIAMETER

SPRING

FREE LENGTH SPRING PART

NUMBER

SPRING

COLOR

psig bar psi bar In. mm In. mm

3 to 15

5 to 20

5 to 35

0.21 to 1.0

0.35 to 1.4

0.35 to 2.4

13.5

0.69

0.93

1.5

0.168

0.187

0.218

4.27

4.75

5.54

2.94

2.81

2.50

74.6

71.4

63.5

1D892327022

1D751527022

1D665927022

Red

Cadmium

Blue

30 to 60

40 to 100

60 to 150

2.1 to 4.1

2.8 to 6.9

4.1 to 10.3

2.1

3.7

4.6

0.234

0.283

0.240

5.94

7.19

6.10

2.57

2.31

2.63

65.2

58.7

66.8

1D7455T0012

1E543627142

1P901327142

Green

Yellow

Brown

Maximum Inlet Pressure(1)

150 psig / 10.3 bar

Set Pressure Ranges(1)

See Table 1

Maximum Control Pressure to Diaphragm(1)

150 psig / 10.3 bar

Temperature Capabilities(1)

-20 to 150°F / -29 to 66°C

Flow Coefcients

(2)

Connection A to B: 138

Connection A to C: 131

Connection A to B: 28.0

Connection A to C: 32.5

Control Connection

1/4 NPT

Approximate Weight

5 lbs / 2.3 kg

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

2. At an inlet pressure of 25 psig / 1.7 bar and with full pressure drop across the body.

Principle of Operation

Refer to Figure 2. The ow through the Type 122A valve

is normally from port A to C, with the spring force holding

the valve plug down on port B (diverging service).

As the pressure under the diaphragm is increased

through port D, it acts against the force of the spring.

When the control pressure overcomes the force of

the spring, the valve begins to stroke, opening port B.

Once the pressure under the diaphragm reaches

setpoint plus build-up, the valve completes its stroke

and the port C seat ring is closed. The valve will only

fully stroke when build-up above setpoint is achieved.

The point at which the valve completes its stroke

and the pressure change necessary to do this are

dependent on the spring rate and the set point

chosen. The set pressure is easily changed by

adjusting the screw at the top of the valve.

Type 122A

Figure 2. Type 122A Three-Way Switching Valve Operational Schematic

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

A2606

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

ADJUSTING SCREW

UPPER VALVE SEAT

LOWER VALVE SEAT

DIAPHRAGM

SPRING

STEM

PORT D

PORT A PORT C

PORT B

VALVE

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 Specications 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. Protect

the vent opening against the entrance of moisture

or any other material that could plug the vent.

2. Apply pipe compound to external pipeline threads.

Connect piping to the body connections.

3. Connect the control pressure line to the 1/4 NPT

connection in the lower diaphragm case.

Overpressure Protection

Type 122A three-way switching valves have

maximum outlet pressure ratings that are lower than

their maximum inlet pressure ratings. A pressure-

relieving or pressure-limiting device is needed if inlet

pressure can exceed the maximum outlet pressure

rating. Overpressuring any portion of a switching

valve or associated equipment may cause leakage,

parts damage or personal injury due to bursting of

pressure-containing parts or explosion of accumulated

gas. Switching valve operation within ratings does

not preclude the possibility of damage from external

sources or from debris in the pipeline. A switching

valve should be inspected for damage periodically and

after any overpressure condition.

Startup and Adjustment

Key numbers is referenced in Figure 3.

1. With proper installation completed and

downstream equipment properly adjusted, slowly

open the upstream and downstream shutoff valve

(when used) while using pressure gauges to

monitor pressure.

WARNING

To avoid personal injury, property

damage or equipment damage caused

by bursting of pressure containing

parts or explosion of accumulated

gas, never adjust the control spring

to produce an outlet pressure higher

than the upper limit of the outlet

pressure range for that particular

spring. If the desired outlet pressure

is not within the range of the control

spring, install a spring of the proper

range according to the diaphragm parts

maintenance procedure.

2. Refer to the nameplate (key 25, Figure 3) for

the spring range. To change the spring setting,

loosen the locknut (key 30, Figure 3) and rotate

the adjusting screw (key 7, Figure 3). Rotating

the adjusting screw clockwise into the spring

case (key 1, Figure 3) increases the control

pressure at which the valve switches. Rotating

the adjusting screw counterclockwise decreases

the switching pressure.

Maintenance

Parts are subject to normal wear and must be

inspected and replaced periodically. The frequency of

parts inspection and replacement depends upon the

severity of service conditions.

Instructions are given below for complete disassembly

and assembly. Disassemble the valve only as far as

needed. Then, begin the “Assembly” procedure at the

appropriate step.

Key numbers used in these procedures are shown

in Figure 3.

WARNING

To avoid personal injury and equipment

damage caused by sudden release

of process pressure or uncontrolled

process uid, isolate the valve from all

pressure and release all pressure from

the valve body and diaphragm casing

before attempting maintenance.

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 in. / 11 mm across the ats.

4. Unscrew and remove the spring case cap screws

and nuts (keys 26 and 4). Remove the spring case,

upper spring seat and spring (keys 1, 31 and 3).

5. Unscrew the hex nuts (key 4) from the stem

(key 5). Remove the spring guide, diaphragm

head, diaphragm, O-ring, back-up ring and

washer (keys 6, 8, 9, 12, 13 and 10).

6. Unscrew the remaining hex nuts from the stem

and pull the disk holder assembly (key 22) and

attached stem out through the bottom opening.

7. Remove the disk holder from the stem.

8. Disconnect the control line from the diaphragm

case (key 2). Unscrew the union nut (key 19) and

remove the diaphragm case, snap ring (key 20)

and body gasket (key 21) from the body (key 23).

9. Unscrew the self-tapping screws (key 16) from

each end of the diaphragm case. Remove the

washers and guide bushings (keys 14 and 15).

10. Remove the O-ring and back-up rings (keys 12

and 13) from the diaphragm end of the diaphragm

case and remove the felt washers, at washer,

O-ring and back-up rings (keys 18, 17, 12 and 13)

from the valve end of the diaphragm casing.

11. Use a thin-wall socket wrench to remove the upper

seat ring (key 24).

Assembly

1. Screw the upper seat ring (key 24) into the body

(key 23).

2. Install the back-up rings and O-rings (keys 13

and 12) into each end of the diaphragm case

(key 2).

3. Install the washer (key 17) and three felt washers

(key 18) into the valve end of the diaphragm case.

Replace the guide bushings (key 15) in each end

of the diaphragm casing. Carefully insert the stem

(key 5) through the diaphragm casing to be sure the

parts are aligned. Attach the washers (key 14) with

self-tapping screws (key 16). Remove the stem.

4. Replace the body gasket and snap ring (keys 21

and 20). Secure the diaphragm case to the body

with the union nut (key 19).

5. Coat the threads on the valve end of the stem

with high strength threadlocker. Attach the disk

holder assembly (key 22) to the stem. Carefully

install the stem through the opening of the body.

6. Screw two hex lock nuts onto the stem. Install

the back-up ring, washer, O-ring, diaphragm,

diaphragm head and spring guide (keys 13, 10, 12,

9, 8 and 6). Secure with two hex lock nuts (key 4).

7. Set the spring and spring seat (keys 3 and 31)

onto the spring guide. Attach the spring case with

cap screws in a crisscross pattern.

8. Screw the lower seat ring (key 37) into the bottom

connector (key 36). Install the bottom connector

into the body.

9. Re-connect piping to the bottom connector and to

the control connection in the diaphragm casing.

10. Adjust the spring by following the

“Adjustment” instructions.

Parts Ordering

When corresponding with your local Sales Ofce

about this valve, mention the serial number and

all other data stamped on the nameplate. When

ordering replacement parts, also state the complete

11-character part number of each part required as

found in the following parts list.

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* Stem, 316 Stainless steel 1R177435162

6 Spring Guide,

Plated steel 1D666625072

7 Adjusting Screw,

Plated steel 1D995448702

8 Diaphragm Plate,

Plated steel 1D666428982

9* Diaphragm,

Neoprene (CR) 1D666302102

10 Washer, Plated steel 1D716228982

12* O-ring, Nitrile (NBR)

(3 required) 1E472706992

13* Back-up Ring, Leather

(5 required) 14B0155X012

14 Retaining Washer, Stainless steel

(2 required) 1K786935022

15* Guide Bushing, Iron

(2 required) 1K787021052

16 Self-Tapping Screw, Plated steel

(4 required) 1J336928982

17 Washer, Stainless steel 1K787135022

18* Washer, Neoprene (CR)/Felt

(3 required) 1K787206992

19 Union Nut,

Ductile iron 1E471119062

*Recommended spare parts

20 Snap Ring, Plated steel 1A832648722

21 Body Gasket,

Composition 1A832504032

22* Disk Holder Assembly

Aluminum/Nitrile (NBR) 1R1772000A2

Stainless steel/Nitrile (NBR) 1R1772X00A2

Stainless steel/Fluorocarbon (FKM) 1R1772X0032

23 Body, Cast iron

3/4 NPT 1D3124X0022

1 NPT 1D3125X0022

WCC Steel

3/4 NPT 1E162622012

1 NPT 1K886222012

24* Upper Valve Seat

Aluminum 1B810309012

Stainless steel 1B8103X0012

25 Name Plate - - - - - - - - - - -

26 Cap Screw, Plated steel

(8 required) 1B720924052

28 Drive Screw, Plated steel

(4 required) 1E501728982

29 Vent Assembly EMY602X1-A12

30 Locknut, Zinc-plated steel 1D667728982

31 Upper Spring Seat, Plated steel 1D667125072

36 Bottom Flange, Plated steel 1R177524092

37* Lower Valve Seat

Aluminum 1R177309012

Stainless steel 1R1773X00A2

WCC Steel

3/4 NPT 1E162622012

1 NPT 1K886222012

Key Description Part Number

Type 122A

Figure 3. Type 122A Three-Way Switching Valve Assembly

20A9801-A

37 36

Type 122A

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.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or

guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specications of such

products at any time without notice.

Emerson Process Management Regulator Technologies, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and

maintenance of any Emerson Process Management Regulator Technologies, Inc. product remains solely with the purchaser.

Industrial Regulators

Emerson Process Management

Regulator Technologies, Inc.

USA - Headquarters

McKinney, Texas 75070 USA

Tel: +1 800 558 5853

Outside U.S. +1 972 548 3574

Asia-Pacic

Shanghai 201206, China

Tel: +86 21 2892 9000

Europe

Bologna 40013, Italy

Tel: +39 051 419 0611

Middle East and Africa

Dubai, United Arab Emirates

Tel: +971 4811 8100

Natural Gas Technologies

Emerson Process Management

Regulator Technologies, Inc.

USA - Headquarters

McKinney, Texas 75070 USA

Tel: +1 800 558 5853

Outside U.S. +1 972 548 3574

Asia-Pacic

Singapore 128461, Singapore

Tel: +65 6770 8337

Europe

Bologna 40013, Italy

Tel: +39 051 419 0611

Chartres 28008, France

Tel: +33 2 37 33 47 00

Middle East and Africa

Dubai, United Arab Emirates

Tel: +971 4811 8100

TESCOM

Emerson Process Management

Tescom Corporation

USA - Headquarters

Elk River, Minnesota 55330-2445, USA

Tels: +1 763 241 3238

+1 800 447 1250

Europe

Selmsdorf 23923, Germany

Tel: +49 38823 31 287

Asia-Pacic

Shanghai 201206, China

Tel: +86 21 2892 9499

For further information visit www.fisherregulators.com

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