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Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

this journal bearing will be flush with the valve body

bore.

5. Insert the outboard journal bearing (key 10) into

the bore on top of the extension housing.

6. Install the valve disc by placing the disc into the

valve body bore so the curved side of the disc

passes through the end of the valve body that does

not contain the T-slot. Align the shaft bore in the disc

with the bearing bores.

7. Insert the drive shaft end opposite the double D

or keyed end into the valve body through the

packing box. Push the shaft through the bearing

stop. Taking care not to dislodge the journal bearing,

push the shaft through the journal bearing and the

valve disc and into the bore on the opposite side of

the valve body.

CAUTION

To avoid damage to the taper key,

tangential pins, disc pins, valve disc,

or shaft(s) resulting from the

application of excessive force, use

appropriate care when driving the key

or pins into the disc hub and shaft(s).

Use the right tool. Do not use

excessive force.

8. Be sure the taper key disc shaft joint is free of oil

or grease. If necessary, remove any excess welding

material from the taper key.

9. Align the taper key hole in the shaft with the holes

in the shaft boss on the disc. Insert the taper key.

Use a flat-end punch to drive the taper key until solid

contact is felt. Measure the depth of the taper key

head for a reference during the following steps.

a. Drive the taper key in farther as follows:

Valve Size, Inches

Minimum Depth to Drive

Taper key After Initial Solid

Contact, mm (Inches)

ANSI Class 150 and 300,

size 3, 4, 6-inch valves, and

8-inch ANSI Class 150 valves

5 (0.188)

b. The disc, shaft, and taper key assembly must

be inspected to verify that the taper key spans

the entire shaft flat width. If so, this procedure is

complete. If not, the taper key must be driven in

farther until this condition is satisfied. However,

do not exceed the following depth limits:

Valve Size, Inches

Maximum Allowable Depth to

Drive Taper key After Initial

Solid Contact, mm (Inches)

3, and 4-inch ANSI Class 150/300 7 (0.281)

6-inch ANSI Class 300, and 8-inch

ANSI Class 150

8 (0.312)

10. After driving the taper key in place, arc spot

weld the head of the taper key to the disc. For valve

sizes 3-, 4-, and 6-inch, use an arc spot weld bead

of 1/8-inch diameter. For valve sizes 8-, 10-, and

12-inch sizes, use an arc spot weld bead of

3/16-inch diameter.

11. Install the packing as described in the Packing

Replacement section.

Installing a Two-Piece Shaft

Unless otherwise indicated, key numbers and part

names are listed in figures 7 and 8.

1. Secure the valve in an upright position. Allow for

easy access to the valve body bore. Allow for easy

access to the drive shaft bearing bore and the

follower shaft bearing bore.

2. Inspect all parts removed from the valve for wear

or damage. Replace any worn or damaged parts.

Clean the valve body and all parts to be installed

with an appropriate solvent or degreaser.

CAUTION

Premature valve failure and loss of

process control may result if bearings

are improperly installed or are

damaged during installation.

3. Using caution to prevent damage to the bearings,

insert the required number of journal bearings (key

9) from the valve body bore into the drive shaft

bearing bore. When properly installed, one end of

the journal bearing(s) will be flush with the interior

end of the extension housing, the other end of the

journal bearing(s) will be flush with the valve body

bore.

The drive shaft thrust bearing (key 28) will be

installed in step 6.

4. Insert one journal bearing from the valve body

bore into the follower shaft bearing bore so it is flush

with the valve body bore.

5. Insert the outboard journal bearing (key 10) into

the bore on top of the extension housing.

6. Insert the drive shaft into the valve body through

the extension housing . Push the drive shaft through

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