Valve Flow Rate for Liquid

on 13 February 2019. 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)	\( dimensionless \)	\( dimensionless \)
\( K_v \) = Valve Flow Coefficient (SI units)	\( dimensionless \)	\( dimensionless \)
\( \Delta P \) = Valve Pressure Differential	\(lbf\;/\;in^2\)	\(Pa\)
\( SG \) = Liquid Specific Gravity (Water at 60°F = 1.0000)	\( dimensionless \)	\( dimensionless \)

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