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Check Valves
ANSI Stud Bolting
Valve
Size
Class 125 Class 150 Class 300 Class 600
2
4
5/8
5 1/4
4
5/8
5 1/2
6
8
5/8
5 3/4
6 3/4
8
5/8
6 1/2
7
3
4
5/8
5 3/4
4
5/8
6 1/2
7
8
3/4
7
8
8
3/4
7 3/4
8 1/4
4
8
5/8
6 1/4
8
5/8
6 1/2
7
8
3/4
7 1/4
8 1/4
8
7/8
9 1/4
9 1/2
6
8
3/4
7
8
3/4
7 3/4
8 1/4
12
3/4
8 3/4
9 3/4
12
1
12
12 1/2
8
8
3/4
8
8
3/4
9 1/4
9 3/4
12
7/8
10 1/2
11 1/4
12
1 1/8
14 1/4
14 1/2
10
12
7/8
9
12
7/8
10 1/2
11
16
1
12
12 3/4
16
1 1/4
16 3/4
17 1/4
12
12
7/8
10 1/2
12
7/8
11 3/4
12 1/4
16
1 1/8
13 3/4
14 3/4
20
1 1/4
17 3/4
18
14
12
1
12
12
1
12 1/4
13 1/4
20
1 1/8
16 1/4
16 1/4
20
1 3/8
20
20
16
16
1
13 1/4
16
1
13 1/4
14 1/2
20
1 1/4
16 3/4
16 3/4
20
1 1/2
22 1/2
22 1/2
18
16
1 1/8
14
16
1 1/8
14
15 1/4
24
1 1/4
19
19
20
1 5/8
24 1/2
24 1/2
20
20
1 1/8
14 1/4
20
1 1/8
14 1/2
15 1/2
24
1 1/4
20 1/4
21 1/4
24
1 5/8
26
27
24
20
1 1/4
16 1/2
20
1 1/4
16 3/4
16 3/4
24
1 1/2
22 1/2
22 1/2
24
1 7/8
30 1/2
30 1/2

Valve
Size
Class 900 Class 1500 Class 2500
2
8
7/8
8 1/2
8 3/4
8
7/8
8 1/2
8 3/4
8
1
9 3/4
10
3
8
7/8
9
9 1/4
8
1 1/8
10 1/4
10 1/2
8
1 1/4
12
12 1/4
4
8
1 1/8
10 3/4
11
8
1 1/4
11 3/4
12
8
1 1/2
14
14 1/2
6
12
1 1/8
14
14
12
1 3/8
16 1/2
16 3/4
8
2
20
20 1/2
8
12
1 3/8
16 3/4
17 1/4
12
1 5/8
19 1/2
20
12
2
23 1/4
24
10
16
1 3/8
18 3/4
19
12
1 7/8
23 1/4
23 1/2
12
2 1/2
29 1/2
30 1/4
12
20
1 3/8
21 1/2
21 3/4
16
2
27
27 1/2
12
2 3/4
33 1/2
34 1/2
14
-
-
-
-
-
-
-
-
-
-
-
-
16
-
-
-
-
-
-
-
-
-
-
-
-
18
-
-
-
-
-
-
-
-
-
-
-
-
20
-
-
-
-
-
-
-
-
-
-
-
-
24
-
-
-
-
-
-
-
-
-
-
-
-

Installation Data
The Sure Flow Check valve is designed so that it is centralized between the flanges when the stud bolts are in position. The outside diameter of the body is equal to the bolt circle PCD minus the diameter of one bolt. It is suitable for use in a variety of orientations. In horizontal lines the valve is installed with the pins vertical (i.e. with the pin retainers at the top). For sizes 6 " and upwards the valve is tapped to take an eyebolt for lifting. Arrows cast into the body indicate the normal direction of flow. Before initial installation it is advisable to open the plates by hand since, if the valve is held in store for a period of time, the corrosion inhibitor may have caused the plates to stick to the body and line pressure may not be sufficient to break this seal. If the bottom half of the studs are installed first they will serve as a platform to support the valve whilst the gaskets and other studs are put in. Similarly, if the valve is to be removed from the line, the top half of the studs should be removed and the bottom half slackened.
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