Common
Flow coefficient
Measure of a device's efficiency at allowing fluid flow
Flow coefficient
The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. A greater restriction in flow will create a larger pressure drop across a device and thus a smaller flow coefficient, conversely device with little restriction in flow will have a small pressure drop and a larger flow coefficient. For example, the flow coefficient of a 1" ball valve may be 80 while a similarly sized globe valve in the same application may be 10. Mathematically the flow coefficient Cv (or flow-capacity rating of valve) can be expressed as C v = Q RD Δ P , {\displaystyle C_{\text{v}}=Q{\sqrt...
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