Watts S518 / S1518 - Manual (Page 2)

Headloss
Flow Rate - Gallons per minute (Water)
Pressure Drop (psi)
Angle
Globe
2 4 6 8 10 20 40 60 80 100 200 500 1000 2000 5000 10000 20000
100
80
60
40
30
20
10
8
6
4
3
2
Maximum continuous flow based on velocity of 20 ft. per second.
Maximum intermittent flow based on velocity of 25 ft. per second.
The C
v
Factor of a value is the flow rate in US GPM at 60°F that will cause a 1psi drop in pressure.
The factors stated are based upon a fully open valve.
C
v
factor can be used in the following equations to determine Flow (Q) and Pressure Drop (∆P):
Q (Flow) = C
v
√∆P ∆P (Pressure Drop) = (Q/C
v
) 2
ES-ACV-S518-S1518 1219 © 2012 Watts
USA: Tel. (713) 943-0688 • (713) 944-9445 • www.watts.com A Watts Water Technologies Company
S518-S1518 — Full Port Stainless Steel Dual Chamber Basic Valve with
Mechanical Check Feature
Flow Data - ACV S518 (Globe) / S1518 (Angle)
Valve Size - Inches 4 6 8 10 12 16
Maximum Continuous
Flow Rate Gpm (Water)
800 1850 3100 5000 7000 11100
Maximum Intermittent
Flow Rate Gpm (Water)
1000 2300 4000 6250 8900 14100
CV Factor GPM (Globe) 210 460 790 1260 1725 2940
CV Factor GPM (Angle) 250 561 990 1590 2500 4200
Estimated
Valve Cover Chamber Capacity
Valve Size - Inches 4 6 8 10 12 16
fluid oz. 22 70
U.S. Gal 1-1/4 2-1/2 4 9-1/2
Valve Travel
Valve Size - Inches 4 6 8 10 12 16
Travel - Inches 1 1-1/2 2 2-1/2 3 4
4 6 8 10 12 16
4 6 8 10 12 16