RECOMMENDED FLOW RATE RANGES

This chart is based on flow of clean water at ambient temperature. Consult our engineering department for pressure drop information for steam, gases or viscous fluids.
Piping practice recommends placement of check valve a distance equal to 5 pipe diameters from any turbulence producing device such as elbows, pumps, etc

Cv and Cracking Pressure

Size Cv Cracking
Pressure(psi)
2" 48 0.230
2.5" 77 0.260
3" 135 0.210
4" 270 0.220
5" 450 0.180
6" 720 0.140
8" 1400 0.190
10" 2600 0.180
12" 3850 0.170
14" 5000 0.150
16" 7250 0.160
18" 10,000 0.150
20" 12,400 0.130
24" 20,400 0.100
30" 38,000 0.080
36" 60,000 0.080
42" 89,000 0.050
48" 124,000 0.060

Cv value
Cv indicates the gallons of water at
temperature +60°F flowing through the
valve bore in pressure differential down
1 Lbs/Inch 2 (0.0068694757Mpa).

HORIZONTAL INSTALLATION ONLY

Media Flow Rate
Liquid

3 to 11 feet/second
0.91 to 3.35 m/second

Gas

20 to 250 feet/second
6.1 to 76.2 m/second

Pressure Drop Chart

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