Basic Documentation

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Water Capacity Tables for Zone Valves
Valve Size
Inches
Pressure Differential — psi English (AB→A)
Cv\1 2 3 4 5 6 8 10 15 20 25 30 40 50 60 75
1/2 1.0 1. 4 1.7 2.0 2.2 2.4 2.8 3.2 3.9 4.4 5.0 5.5 6.3 7.1 7.7 8.7
1/2 2.5 3.5 4.3 5.0 5.6 6.1 7.1 7.9 9.7 11.2 12.5 13.7 15.8 17.7 19.4 22.0
1/2 4.1 5.7 7.1 8.2 9.2 10.0 11.6 13.0 15.9 18.3 20.5 22.4 25.9 29.0 31.8 35.5
1
7.0 9.9 12.1 14.0 15.6 17.1 19.8 22.1 27.1 31.3 35.0 38.3 44.3 49.5 54.2 60.6
Table is expressed in U.S. Gallons per minute (GPM).
Valve Size
mm
Pressure Differential — psi Metric (AB→A)
1 10 20 30 40 50 60 80 100 (Kvs) 150 200 300 400 500
15 0.09 0.27 0.38 0.47 0.54 0.60 0.66 0.76 0.85 1.04 1.20 1.47 1.70 1.90
15 0.22 0.68 0.96 1.18 1.36 1.52 1.67 1.92 2.15 2.63 3.04 3.72 4.30 4.81
15/20 0.35 1.11 1.57 1.92 2.21 2.47 2.71 3.13 3.50 4.29 4.95 6.06 7.00 7.83
25 0.60 1.90 2.68 3.29 3.79 4.24 4.65 5.37 6.00 7.35 8.49 10.39 12.00 13.42
Table expressed in Cubic Meters per Hour (m
3
/hr).
Close-off Pressures for Zone Valves
Bronze
Valve Size
Inch (mm)
Pressure
psi (KPa)
1/2 (15) 44 (303)
3/4 (20) 44 (303)
1 (25) 22 (152)
Control Valve Sizing and Selection