Cv Value For Valves Definition. This is used as a guide and is not a linear progression. The valve coefficient, cv, is a number which represents the capability of a valve (or any flow component) to flow a fluid.
Known as cv, the flow coefficient is a relative value that allows us to compare the efficiency of different valves regardless of their size or type. Kv = 0.865 · cv cv = 1,156 · kv (equivalence between flow coefficients kv and cv) The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as:
In my opinion, calculated cv is a cv value calculated at particular conditions (p1, p2, flow rate, specific gravity etc.).
Online calculator to quickly determine valve and orifice cv & kvs values for air. {\displaystyle c_ {v}=q {\sqrt {\dfrac {\text {sg}} {\delta p}}}} where: A valve that is sized correctly is a valve that is quiet, has accurate flow control, lasts beyond its expected life span, and does not leak. The cv is the number of us gallons of water the valve will pass with a differential pressure of 1 psi.