How do you calculate valve CV?
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Cv by definition is the number of gallons per minute (GPM) a valve will flow with a 1 psi pressure drop across the valve. For example a valve with a Cv of 10 will flow 10 GPM with a 1 psi pressure drop. The formula used to select the valve Cv with the specified differential pressure is: Cv=GPM/((SQ RT(∆P)).
Control Valve Sizing
- When sizing a control valve, the most common approach is to calculate the flow coefficient, Cv which is a measure of the capacity of the valve body and trim
- C = Q/N1 * √ (ρ1/ρ0) / (∆P)
- ρ1/ρ0 is the relative density
- Fluid Density: 965.4 kg/m3
- Flow Rate (Q): 360 m3/h
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