Valve Flow Rate for Liquid

on . Posted in Fluid Dynamics

  

Valve Flow Rate for Liquid Formulas

\( Q = C_v \sqrt{ \Delta p\;/\;SG } \)     (US units)

\( Q = K_v \sqrt{ \Delta p\;/\;SG } \)     (SI units)

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

 

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Tags: Flow Liquid Valve Sizing