Valve Flow Rate for Liquid

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Valve Flow Rate for Liquid Formulas

\(\large{ Q = C_v \sqrt {\frac {\Delta p} {SG} } }\)  (US units) 
\(\large{ Q = K_v \sqrt {\frac {\Delta p} {SG} } }\)  (SI units) 

Where:

 Units English Metric
\(\large{ Q }\) = valve flow rate \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\)
\(\large{ C_v }\) = valve flow coefficient (US units) \(\large{ dimensionless }\)
\(\large{ K_v }\) = valve flow coefficient (SI units) \(\large{ dimensionless }\)
\(\large{ \Delta P }\) = valve pressure differential \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ SG }\) = specific gravity of liquid (water at 60°F = 1.0000) \(\large{ dimensionless }\)

 

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Tags: Equations for Flow Equations for Valves Equations for Liquid Equations for Valve Sizing