Why we Measure Control Valve flow coefficient (Cv) ?
Control valve Cv is determined by the manufacturer of the valve and can be found on the valve manufacturer’s related valve data and specification sheets.
Valves are tested by running water through it before publishing the Cv value. It can be assumed that the tests are done with water (unless otherwise noted), using a specific gravity of 1.0, 1.2 centistoke viscosity, and a standard temperature of 60 degrees Fahrenheit.
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