Emerson A31A Manual de Instruções descarregar pdf (Página 16)

Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

the journal bearing(s). Hold the drive shaft thrust

bearing (key 28) in the valve body bore against the

opening of the drive shaft bearing bore. Push the

drive shaft through the bearing bore just enough to

hold the thrust bearing.

7. Insert the follower shaft through the bore in the

valve body uncovered by removal of the gasket

retainer. Hold the follower shaft thrust bearing (key

28) in the valve body bore against the opening of the

follower shaft bearing bore. Push the follower shaft

through the bearing bore just enough to hold the

thrust bearing.

8. Install the valve disc. Place the flat side of the

disc on a flat surface. Then, move the valve body

from its upright position and suspend the valve body

over the disc so the seal ring/T-slot area is facing up.

Align the shaft bores through the disc with the drive

shaft and follower shaft bores. Lower the valve body

over the disc using caution not to dislodge or

damage the thrust bearings placed on the ends of

the shafts.

9. With the valve disc properly positioned in the

valve body, push the drive shaft and follower shaft

the rest of the way through the thrust bearings and

into the shaft bores in the valve disc.

10. Align the holes in the shafts with the holes in the

disc.

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 correct tool, and do not use

excessive force.

11. Before installing the taper key, 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.

12. Install the appropriate taper key, tangential pins,

and disc pins. Install the taper key by aligning the

taper key hole in the shaft with the holes in the shaft

boss on the disc. Insert the taper key. Use a pin

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)

8-inch ANSI Class 300, 10- and

12-inch ANSI Class 150, and 10-inch

ANSI Class 300 valves

6 (0.219)

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)

8-inch ANSI Class 300, and

10- and 12-inch ANSI Class 150

10 (0.375)

10-inch ANSI Class 300 11 (0.406)

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

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

sizes 8-, 10- and 12-inch, use an arc spot weld bead

of 3/16-inch in diameter.

14. Install the packing as described in the Packing

Replacement section.

Installing the Gasket Retainer

Valves with a two-piece shaft use a gasket retainer

and gasket to cover the follower shaft opening in the

valve body.

1. Replace the gasket (key 15) and gasket retainer

(key 14) over the end of the follower shaft. Use a

new gasket.

2. Replace the four hex head bolts (key 21) and

lockwashers (key 20) to hold the gasket retainer in

place.

3. Be sure to center the gasket over the follower

shaft bore before retightening the bolts. Tighten

down the bolts evenly in a crossover or star pattern.

Refer to table 5 for proper torque values.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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