RATED WATER CAPACITY CHART
T
YPE C34 PILOT OPERATED MAIN VALVE
(Specific Gravity of 1)
E
XAMPLE
Required maximum flow is 100 GPM, Inlet Pressure is 60 psi,
Delivery Pressure is 35 psi (Pressure drop is 25 psi). Enter the
Capacity Chart at the 100 GPM line and follow up to 25 psi
pressure drop. It falls to the right of the 11/2" valve size line,
therefore 2" is the minimum valve size required.
V
ALVE S
IZE SELECTION
Prior to selecting valve size, the maximum required flow and
the pressure drop across the valve must be determined. Enter
the Capacity Chart at the maximum required flow GPM and
follow vertically to the intersection of the horizontal pressure
drop line. The valve size nearest to, but to the right of this
intersection is the smallest valve that will satisfy the flow
requirements.
The vertical portion of the curves indicate the flow at which
approximately 15 feet per second velocity is reached. By
selecting the next larger size valve, a lower velocity may be
maintained. For general service, 8 to 10 feet per second is
recommended.
10
20
30
40
50
60
70
80
90
200
20 30 40 50 60 80 100 200 300 400 600 800 1000 1500
FLOW IN GALLONS PER MINUTE
PRESSURE DROP – PSI
VALVE INFO
PAGE 38
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TYPE C34 WATER
CAPACITY CHART
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