The Valve Flow Coefficient (Cv)
The valve flow coefficient Cv or its metric equivalent Kv has been adopted universally as a comparative value for measuring the capacity of control valves.
The valve flow coefficient, Cv, is the number of U.S. gallons per minute of water at 60°F that will flow through a control valve at a specified opening when a pressure differential of 1psi is applied across the valve:
The metric equivalent of Cv is Kv, which is defined as the amount of water that will flow in m3/hr with 1bar pressure drop. Converting between

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