Cv Value For Control Valve. Root of ( δp/sg) q = flow in us gpm. For on/off control, it is common practice to select a valve with connections that are the same size as the piping.
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What is cv , valve flow coefficient? Has been contributed to offer high quality product to the global market. But most of the time, valve datasheets are not available.
It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate.
It applies to the factor of the head drop (δh) or pressure drop (δp) over a valve with the flow rate q. A control valve has a cv of 5. Sg = specific gravity of fluid (reference against water at 60 °f) now we discuss about how we get the conversion factor of 1.156 in the formula, cv = 1.156kv. It is defined as the flow rate in us gallons per minute [gpm] of water at a temperature of 60º fahrenheit with a pressure drop across the valve of 1 psi.
