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Check Valves
Pressure Loss Through Valves


We will provide valves to match your performance requirements
The curves shown above relate to valves provided with standard rated springs
Higher value springs may be required to ensure faster reaction if very large changes in velocity occur
It should be borne in mind that a media (liquid) velocity in the pipeline of 10 ft per second is considered to be desirable for normal applications

Percent of Flow Area Sure Flow
Check vs Standard Steel Pipe
Size
Pressure Class
150
300
600
900
1500
2500
2"
36.7
36.7
44.0
54.4
54.4
36.1
3"
39.1
39.1
43.8
46.6
46.6
32.8
4"
41.4
41.4
45.8
47.7
47.7
29.5
6"
54.0
54.0
58.5
52.9
52.9
33.4
8"
56.7
56.7
57.8
58.6
58.6
32.7
10"
56.0
56.0
67.9
70.5
52.6
30.9
12"
61.8
61.8
63.0
71.8
62.0
31.2
14"
66.7
72.5
62.9
75.4
75.4
-
16"
64.3
55.2
67.9
71.8
71.8
-
18"
74.5
69.9
64.8
76.4
74.0
-
20"
70.8
65.1
67.4
84.0
81.0
-
24"
66.0
63.4
68.3
71.4
71.0
-
Approximate performance data for Sure Flow Check valves when used with water at 60° F with a nominal 10 ft/sec velocity
Valve Size
Flow (imperial gals/min)
Pressure drop psi
Head loss in feet
Approx. equiv. length of pipe
in feet
2"
86
4.49
10.32
30
3"
192
2.97
6.83
34
4"
368
2.30
5.29
35
6"
750
1.47
3.38
37
8"
1292
1.20
2.76
40
10"
2116
0.93
2.14
41
12"
2920
0.81
1.87
44
14"
3570
0.74
1.70
45
16"
4750
0.60
1.38
47
18"
6600
0.55
1.27
47
20"
7500
0.51
1.18
50
24"
12500
0.42
0.97
52
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