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Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

2. Install the seal ring and backup ring assembly in

the valve body. The wider outside diameter of the

seal ring goes into the T-slot area of the valve body

as shown in figure 5. Start the edge with the wider

diameter into the T-slot of the valve body.

CAUTION

Use extreme care to avoid damaging

the gasket while punching one initial

screw hole through the gasket for

alignment in the following step.

3. Once the seal ring and backup ring have been

fully installed into the valve body T-slot, the retaining

ring gasket can be installed. This gasket is a thin

graphite material. Use extreme care to avoid

damaging the gasket while punching one initial

screw hole through the gasket for alignment.

4. Install the retaining ring, and align the screw

holes in the retaining ring with the holes in the valve

body. Install the first retaining ring screw through the

punched hole in the retaining ring gasket. Install the

other retaining ring screws by pushing them through

the graphite gasket and threading them into the

valve body.

5. Tighten the retaining ring screws just enough to

eliminate any movement of the retaining ring. Do not

over-tighten the retaining ring screws.

WARNING

Avoid personal injury or property

damage caused by the impact of a

falling or tipping valve. Support large

valves during maintenance.

6. To complete this step, stand the valve up.

Support the valve securely using methods

appropriate for the valve size. If a vise or other

clamps are being used, make certain the flange

gasket sealing area of the valve body is not

damaged.

7. Manually rotate the drive shaft (key 4) to turn the

disc clockwise to meet the seal ring.

8. Place a piece of rubber, or other soft material,

between the disc and internal travel stop to protect

the disc. With a rubber mallet, tap the disc until it

contacts the internal travel stop. When the disc

makes contact with the stop, manually rotate the

disc counterclockwise back out of the seal ring to a

90-degree open position.

9. The final seating of the retaining ring screws can

now be done. For the screw torque values, refer to

table 5.

10. Repeat steps 8 and 9 two more times.

Note

When attaching the actuator to the

valve, make sure the valve disc is not

in contact with the internal travel stop.

The valve disc should be positioned

from 0.03 to 0.76 mm (0.001 to 0.030

inch) away from the internal stop in the

valve body.

CAUTION

When using an actuator, the actuator

travel stops or the actuator travel (for

actuators without adjustable stops)

must be adjusted so that the disc stop

in the valve body does not absorb the

output of the actuator. Failure to limit

actuator travel as described in the next

step can result in damage to the valve

shaft or other valve parts.

11. Use an appropriate tool (such as a feeler gauge)

and position the disc from 0.03 to 0.76 mm (0.001 to

0.030 inch) away from the internal stop in the valve

body.

This adjustment is necessary to be certain that the

actuator output torque is fully absorbed by the

actuator travel stop or by the actuator. The internal

travel stop in the valve body should not absorb any

of the actuator torque.

Kel-F and Kel-F/Aluminum Seal

Installation

Unless otherwise indicated, key numbers and part

names are listed in figures 7 and 8.

A maintenance kit with installation tools is available

through your Fisher sales office.

1. Locate the replacement seal ring (key 7) and note

the shape of the ring. The ring is wider across one

edge diameter and narrower across the other edge

diameter. Also, note the wide groove around the

outside circumference. If an aluminum backup ring

(key 8) is provided, fit this over the back of the seal

ring (matching seal and backup ring angles) prior to

installation in the valve.

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