Valve Pressure Differential for Liquid

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Valve Pressure Differential for Liquid Formulas

\(\large{ \Delta P =   SG  \left( \frac{Q}{C_v} \right)   }\)  (US units) 
\(\large{ \Delta P =   SG  \left( \frac{Q}{K_v} \right)   }\) (US units) 

Where:

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

 

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Tags: Pressure Equations Differential Equations Valve Equations Valve Sizing Equations