# Head Friction Loss in Fittings and Valves

Head loss, abbreviated as \(h_f\), is the pressure drop caused by fittings and valves.

## Formulas that use Head Friction Loss in Fittings and Valves

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

### Where:

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

\(\large{ g }\) = gravitational constant

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

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

Tags: Equations for Friction Equations for Head Equations for Fittings Equations for Valve Sizing