Valve Cv Unit Conversion. Table 2 was prepared for conversion from water, which has a viscosity of 1.12 centistokes at 60°f, to fluids of higher viscosity. The pressure drop or flow rate through a valve or orifice plate is typically calculated using the a flow coefficient, cv or orifice diameter.
※3 for p1 and p2, please use pressure close to the valve. Where cv is flow coefficient of valve or valve sizing coefficient given by manufacturers. Convert volume basis flow rate between several different units.
Valves are tested by running water through it before publishing the cv value.
A cv flow coefficient specifies the amount of water at 60°f (15.55 °c) in us gpm that will flow through a valve and produce a 1.0 psi pressure drop. There are several common ways to express the losses caused by pipe fittings and equipment. Depending on the calculation programs or methods available and engineer may require to convert between one form or another. Kv = 0.865 · cv cv = 1,156 · kv (equivalence between flow coefficients kv and cv)
