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Valve Flow Coefficient (Cv) and Flow Factor (Kv) Summaries and Conversion

Flow coefficient, Cv, and Flow Factor, Kv, are values used to specify the hydraulic capacity of a control valve.

Flow coefficient is an imperial measurement and is defined as: *the flow of water through a valve at 60°F in US gallons/minute (gpm) at a pressure drop of 1lb/in²*.

Flow factor is the metric equivalent of flow coefficient and is defined as: *the flow of water in metres cubed per hour (m³/hr) at a pressure drop of bar*.

This should not be confused with *Discharge Coefficient* which is a non-dimensional factor of a valve used to calculate flow that discharges to the environment.

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