# Head Friction Loss in Fittings and Valves

Head 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:

\(\large{ h_f }\) = head loss frictional resistance

\(\large{ v }\) = flow velocity

\(\large{ g }\) = gravitational constant (32.2 ft/sec)

\(\large{ K }\) = loss coefficient for fittings and valves

Tags: Equations for Friction Equations for Valves Equations for Head Equations for Fittings