CHECK VALVES - SWING, TILTING DISC & PISTON - API594/API6D/BS1868/B16.34
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
16
A P P E N D I X A - C O N T.
TABLE C
Cv Value for API 594/BS 1868 Swing Check Valve
Size
Units
(gal/min)/(lbf/in
2
)
0.5
mm
inch
150LB
300LB
600LB
900LB
1500LB
2500LB
50
2
123.9
123.9
123.9
105.0
105.0
68.1
80
3
281.8
281.8
281.8
259.3
239.4
159.6
100
4
524.1
524.1
521.4
482.7
425.5
267.1
150
6
1234.6
1234.6
1234.6
1140.7
988.2
259.3
200
8
2281.5
2281.5
2213.5
2021.0
1751.1
1180.7
250
10
3573.7
3573.7
3404.3
3137.6
2729.9
300
12
5340.4
5340.4
5104.7
4569.4
3975.9
350
14
6511.0
6511.0
6142.9
5565.3
4794.4
400
16
8624.9
8624.9
8068.6
7268.9
6267.6
450
18
11472.8
11155.6
9575.4
500
20
14304.0
13964.2
12884.7
600
24
20866.1
20419.8
18682.8
750
30
33735.6
TABLE D
Cracking Pressure for API 594/BS 1868 Swing Check Valve
Size
Units kPa
(Psi)
mm
inch
150LB
300LB
600LB
900LB
1500LB
2500LB
50
2
1.93 (0.28)
2.00 (0.29)
2.20 (0.32)
4.75 (0.69)
5.10 (0.74)
7.10 (1.03)
80
3
2.27 (0.33)
2.48 (0.36)
2.82 (0.41)
3.17 (0.46)
4.34 (0.63)
8.54 (1.24)
100
4
1.79 (0.26)
1.93 (0.28)
1.72 (0.25)
2.76 (0.40)
4.48 (0.65)
7.10 (1.03)
150
6
1.24 (0.18)
1.17 (0.17)
2.07 (0.30)
3.58 (0.52)
3.72 (0.54)
8.54 (1.24)
200
8
1.52 (0.22)
1.52 (0.22)
2.27 (0.33)
3.93 (0.57)
4.82 (0.70)
10.54 (1.53)
250
10
1.31 (0.19)
1.31 (0.19)
2.14 (0.31)
4.13 (0.60)
5.79 (0.84)
300
12
1.45 (0.21)
1.45 (0.21)
2.82 (0.41)
4.00 (0.58)
6.13 (0.89)
350
14
2.07 (0.30)
2.14 (0.31)
3.31 (0.48)
3.86 (0.56)
9.78 (1.42)
400
16
1.72 (0.25)
1.72 (0.25)
3.24 (0.47)
4.96 (0.72)
9.65 (1.40)
450
18
1.65 (0.24)
2.14 (0.31)
3.58 (0.52)
5.51 (0.80)
500
20
1.86 (0.27)
2.27 (0.33)
600
24
1.79 (0.26)
2.89 (0.42)
