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Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

Figure 5. Typical Seal Installation

16B5081 / DOC

LARGEST OUTSIDE

DIAMETER (KEY 7)

Table 5. Torque Values for Fasteners

FASTENER NOMINAL

SIZE

RETAINING RING SCREWS GASKET RETAINING BOLTS

NSm InSlbs NSm InSlbs

#10 4.6 41 4.0 35

1/4 11 100 9.2 81

5/16 25 220 19 167

3/8 45 400 33 295

NSm ftSlbs NSm ftSlbs

7/16 72 53 53 39

1/2 112 83 80 59

9/16 161 119 117 86

5/8 225 166 161 119

3/4 401 296 286 210

7/8 651 480 447 330

1 976 720 651 480

1-1/8 1356 1000 837 617

Note: These values are based upon standard materials, S66286/Inconel screws and ASTM A193GRB6 bolts. For other special fastener materials, please contact your Fisher sales

office.

2. Install the seal ring, and if applicable back-up

ring, in the valve body by first placing the wider

outside diameter of the seal ring into the T-slot area

of the valve body as shown in figure 5.

3. Once the seal ring has 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

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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