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Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

Table 4. Hex Head Screw, Stud Bolt and Cap Screw Data

(1)

VALVE

SIZE,

INCH

NUMBER

SIZE DIA. INCH &

THREAD

LENGTH, INCH

Class

150

Class

300

Class

150

Class

300

Class

150

Class

300

Wafer Style with Stud Bolts

3 4 8 5/8-11 3/4-10 5-3/4 6

4 8 8 5/8-11 3/4-10 6 6-1/2

6 8 12 3/4-10 3/4-10 6-1/2 7-1/2

8 8 12 3/4-10 7/8-9 7 9

10 12 16 7/8-9 1-8 8 10

12 12 16 7/8-9 1-1/8-8 8-1/2 11

14 12 16 18 1-1/88 9-1/2 12

16 16 16 18 1-1/48 10 13-1/2

18 16 20 1-1/88 1-1/48 11 13-3/4

20 20 20 1-1/88 1-1/48 12 14-1/2

24 20 20 1-1/48 1-1/28 14 16-1/2

Wafer Style with Cap Screws

14 - - - 8 - - - 1-1/88 - - - 3-1/2

16 - - - 8 - - - 1-1/48 - - - 3-3/4

18 - - - 8 - - - 1-1/48 - - - 4

20 - - - 8 - - - 1-1/48 - - - 4

24 - - - 8 - - - 1-1/28 - - - 4-1/2

Single Flange Style with Cap Screws

3 8 16 5/8-11 3/4-10 1-7/8 2

4 16 16 5/8-11 3/4-10 2 2-1/4

6 16 24 3/4-10 3/4-10 2 2-1/2

8 16 24 3/4-10 7/8-9 2-1/4 3

10 24 32 7/8-9 1-8 2-1/2 3

12 24 32 7/8-9 1-1/8-8 2-3/4 3-3/8

14 24 40 18 1-1/8-8 2-3/4 3-1/2

16 32 40 18 1-1/48 3 3-3/4

18 32 48 1-1/8-8 1-1/48 3-1/4 4

20 40 48 1-1/8-8 1-1/48 3-1/2 4

24 40 48 1-1/48 1-1/28 3-1/2 4-1/2

1. Thread engagement in accordance with ANSI B31.3 “Chemical Plant and

Petroleum Refinery Piping”.

2. Properly orient the valve according to the specific

application. For optimum performance, install the

valve so that the shaft will be on the high pressure

side of the valve at shutoff (reverse flow). Install the

valve and the gaskets between the flanges into the

cradle formed by the flange bolts.

3. Install the remaining flange bolts, making sure to

center the gaskets on the gasket sealing surfaces of

the flange and valve body.

4. Tighten the flange bolts in an alternating

criss-cross fashion to a torque value of one-fourth of

the final bolting torque. Repeat this procedure

several times increasing the torque value each time

by a fourth of the final desired torque. When the final

torque value has been applied, tighten each flange

bolt again to allow for gasket compression.

Note

The optional graphite ribbon packing

and metal bearings are composed of

all conductive material to electrically

bond the shaft to the valve for

hazardous area service, as opposed to

the non-conductive PTFE packing and

bearings.

5. For more information, refer to the Packing

Maintenance section below.

Installing Single-Flange Valves

WARNING

The edges of a rotating valve disc have

a shearing effect that may result in

personal injury. To avoid personal

injury, keep clear of the disc edges

when rotating the disc.

1. See figure 3 for recommended valve orientation.

See table 4 for hex head cap screw specifications.

2. Properly orient the valve according to the specific

application. For optimum shutoff, install the valve for

reverse flow.

3. Position the valve between the flanges. Be sure

to leave enough room for the flange gaskets. Install

the lower flange bolts.

4. Select the appropriate gaskets for the application.

Flat sheet, spiral wound, or other gasket types,

made to the ANSI B16.5 group standard or user’s

standard, can be used on the valve depending on

the service conditions of the application. Install the

gaskets and align the valve and the gaskets.

5. Install the remaining bolts.

6. Tighten the flange bolts in an alternating

criss-cross fashion to a torque value of one-fourth of

the final bolting torque. Repeat this procedure

several times increasing the torque value each time

by a fourth of the final desired torque. When you get

to the final torque value, tighten each flange bolt

again to allow for gasket compression.

Note

The optional graphite ribbon packing

and metal bearings are composed of

all conductive material to electrically

bond the shaft to the valve for

hazardous area service, as opposed to

the non-conductive PTFE packing and

bearings.

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

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