Head Friction Loss in Fittings and Valves

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

hydraulic head loss fitting valveHead loss, abbreviated as \(h_f\), is the pressure drop caused by fittings and valves.

 

Head Friction Loss in Fittings and Valves formula

\(\large{ h_f = K \; \frac{v^2}{2 \; g}  }\) 

Where:

 Units English Metric
\(\large{ h_f }\) = head loss frictional resistance \(\large{ dimensionless }\)
\(\large{ g }\) = gravitational constant \(\large{\frac{lbf-ft^2}{lbm^2}}\)  \(\large{\frac{N - m^2}{kg^2}}\) 
\(\large{ K }\) = loss coefficient for fittings and valves \(\large{ dimensionless }\)
\(\large{ v }\) = velocity of flow \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)

 

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Tags: Friction Equations Valve Equations Hydraulic Equations Head Equations Pipe Fitting Equations Valve Sizing Equations