Water Flow Rate Through a Valve

on . Posted in Fluid Dynamics

    

Water Flow Rate Through a Valve formula

\( Q_w = C_v \; \sqrt { p_1 - p_2 \;/\; SG }   \)
Symbol English Metric
\( Q_w \) = water flow rate \(ft^3\;/\;sec\) \(m^3\;/\;s\)
\( p_1 \) = primary pressure \(lbf\;/\;in^2\) \(Pa\)
\( p_2 \) = secondary pressure \(lbf\;/\;in^2\) \(Pa\)
\( C_v \) = valve flow coefficient \(dimensionless\)
\( SG \) = specific gravity of water \(dimensionless\)

 

Water Flow Rate Through a Valve formula

\( Q_w =  C_v \; F_l \;  \sqrt { p_1 \;-\; F_f \; p_{av} \;/\; SG  }   \)
Symbol English Metric
\( Q_w \) = water flow rate \(ft^3\;/\;sec\) \(m^3\;/\;s\)
\( p_{av} \) = absolute vapor pressure of the water at inlet temperature \(lbf\;/\;in^2\) \(Pa\)
\( F_f \) = liquid critical pressure ratio factor \(dimensionless\)
\( p_1 \) = primary pressure \(lbf\;/\;in^2\) \(Pa\)
\( F_l \) = id pressure recovery factor (= 0.9) \(dimensionless\)
\( C_v \) = valve flow coefficient \(dimensionless\)
\( SG \) = specific gravity of water \(dimensionless\)

 

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Tags: Flow Water Valve Sizing