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CV valve definition 7
- Thread starter adavidi
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Do you mean the definition for Cv with respect to a valve's capacity.
The Cv is the number of US gallons of water the valve will pass with a differential pressure of 1 psi.
The standard equation for a valve's capacity in liquid service is:
Q = Cv(dP/SG)^0.5
This assumes there is no flashing or cavitation of the fluid.
Q is the flowrate, gpm
Cv is the valve Cv
dP is the differential pressure, psi
SG is the specific gravity of the fluid
The Cv is the number of US gallons of water the valve will pass with a differential pressure of 1 psi.
The standard equation for a valve's capacity in liquid service is:
Q = Cv(dP/SG)^0.5
This assumes there is no flashing or cavitation of the fluid.
Q is the flowrate, gpm
Cv is the valve Cv
dP is the differential pressure, psi
SG is the specific gravity of the fluid
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The process of determining the Cv value of a valve is quite impoortant... temp. must remain constant, valve should be tested between 5-15 psid, etc. The Cv value is, to my belief, useless as a tool beyond a convenient number to compare valves.
Check into ISA standards, ISA-S75.02.
Take care
Check into ISA standards, ISA-S75.02.
Take care
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