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Water Control Valves - Flow Coefficient Cv Diagram

Sizing of water control valves - Imperial units.

The flow coefficient C_v for a water control valve can be estimated with the diagram below:

Water valves - Cv diagram

Download Water C_v Diagram

Example - Required C_v for a water control valve

With water flow 6 gpm and designed pressure drop 10 psi through a control valve - the required flow coefficient C_v can be estimated to ~2 as indicated in the chart below.

Water valves - Cv diagram example

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Example - Required Cv for a water control valve

Example - Required C_v for a water control valve