Emerson A31A Manual de instrucciones descargar pdf (Pagina 13)

Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

shaft with the double D or keyed end is

called the drive shaft.

The 3- through 8-inch Class 150 valves

and 3 through 6-inch Class 300 valves

have a one-piece shaft.

Disassembly

WARNING

The edges of a rotating valve disc (key

3) have a shearing effect that might

result in personal injury. To avoid

personal injury, keep clear of the disc

edges when rotating the disc.

CAUTION

When removing the actuator from the

valve, do not use a hammer or similar

tool to drive the lever off the valve

shaft. Driving the lever or actuator off

the valve shaft could damage the valve

internal parts.

If necessary, use a wheel puller to

remove the lever or actuator from the

valve shaft. It is okay to tap the wheel

puller screw lightly to loosen the lever

or actuator, but hitting the screw with

excessive force could also damage

internal valve parts.

Never use a wrench or pliers on the

drive shaft. A damaged shaft could cut

the packing and allow leakage.

Unless otherwise indicated, key numbers and part

names are listed in figures 7 and 8.

1. Remove the actuator and valve, as an assembly,

from the pipeline, and then remove the actuator from

the valve.

Note

It is not necessary to remove the

retaining ring and seal ring when

removing the shaft(s) and disc.

2. Secure the valve in an upright position. Rotate

the disc (key 3) 180 degrees counterclockwise from

the fully closed position by manually turning the drive

shaft.

3. Remove the Anti-Blowout Protection (refer to

figure 6). Remove the hex nuts and pull out the

packing follower.

Note

Class 150 and 300 3- through 24-inch

valve sizes have a bearing stop

pressed into the bearing bore of the

valve body below the extension

housing.

Do not attempt to remove the bearing

stop. If the bearing stop needs

replacement, contact your Fisher sales

office for more information.

4. Remove the packing from around the drive shaft.

Note

Different valves require slightly

different procedures because different

valve sizes/ pressure classes have

different methods of connecting the

disc and shaft(s). To identify the

proper procedures, refer to the list

below.

D Class 150, 3- through 8-inch

sizes: One-piece shaft with 1 taper key.

D Class 150, 10- and 12-inch sizes:

Two-piece shaft. 1 taper key in the

drive shaft; 1 disc pin in the follower

shaft.

D Class 300, 3- through 6-inch

sizes: One-piece shaft with 1 taper key.

D Class 300, 8- and 10-inch sizes:

Two-piece shaft. 1 taper key in the

drive shaft; 1 disc pin in the follower

shaft.

D Class 300, 12-inch size:

Two-piece shaft with 2 tangential pins

in the drive shaft; 1 disc pin in the

follower shaft.

D Class 150 and 300, 14- through

24-inch sizes: Two-piece shaft with 2

tangential pins in the drive shaft; 1

disc pin in the follower shaft.

5. Proceed as appropriate, using the following

instructions.

For valves with taper key(s), locate the taper

key(s) (key 6) which runs through the drive shaft

boss on the back of the valve disc. Using a pin

punch on the smaller end of the key, drive it out of

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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Emerson A31A Manual de instrucciones Pagina 13

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