Emerson Type 119 Switching Valve Manual de instrucciones descargar pdf (Pagina 3)

Type 119

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The control valve spring has been selected to meet

the pressure condition requirements of the application

as specied on the order. This pressure condition is

stamped on the actuator nameplate.

The spring has a xed pressure span over which

loading pressure will stroke the valve. Adjustment of

the spring compression shifts the span so that more

or less loading pressure is required to start travel.

Since the span does not change, there will be a

corresponding increase or decrease in the pressure

requirements at the end of the valve stroke.

If the control valve has been disassembled or pressure

conditions have changed, the spring may need

adjustment to make the valve travel coincide with the

diaphragm pressure range. Make the adjustment in

the following manner. Key numbers refer to Figure 3.

1. Loosen the locknut (key 13) on the spring case.

2. Turn the adjusting screw (key 12) clockwise to

compress the spring (key 16) or counterclockwise to

decrease spring compression. Increased spring

compression results in increased loading pressure

necessary to start travel. Decreased spring

compression results in less loading pressure required

to start travel.

3. After adjustment, tighten the locknut. Note that

the spring can be identied by the color code.

Depending on how much conditions are changed,

it may be necessary to install a new spring, using

appropriate steps in the Maintenance section. After

changing the spring, adjust the valve using the above

steps in this section, and indicate the new spring

range on the nameplate.

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Valve parts are subject to normal wear and must be

inspected and replaced as necessary. Inspection

and maintenance depends on the severity of the

service conditions.

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The following describes the procedure for complete

disassembly and assembly of the actuator-valve body

combination. When inspection or repairs are required,

disassemble only those parts necessary to accomplish

the job. Key numbers refer to Figure 3.



1. Isolate the control valve from all pressure, and

release pressure from the valve body and actuator.

Loosen the locknut (key 13), and remove all spring

compression from the control valve by turning the

adjusting screw (key 12) out of the spring case.

2. Remove the two bonnet cap screws (key 15, not

shown) that secure the bonnet to the body, and lift

the spring case, bonnet, and trim assembly from

the body.

3. Examine the seating edge of the orice (key 3). If it is

nicked or rough, unscrew it from the body with a thin

wall 7/8-inch (22 mm) socket wrench, and replace

it with a new seat ring of the proper size.

4. Remove the bonnet O-ring (key 11), and inspect it

for wear damage.

Warning

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Emerson Type 119 Switching Valve Manual de instrucciones Pagina 3

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