Instruction Manual
D500242X012
A31A Cryogenic-Rotary Valve
February 2019
7
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.
