Cv Calculation For Gas Control Valve. Control valve cv calculation excel all new resume examples. How do we get value 1.156 (conversion factor) in formula cv = 1.156kv or cv= 1.156×q×sqrt (g/delta p).
The cv was designed for use with liquid flows, it expresses the flow in gallons per minute of 60º f water with a pressure drop across the valve of 1 psi. As for liquid control valves, the valve orifice size as given as a “valve flow coefficient” or cv. When gas, instead of liquid flows through this valve does the cv remains same.
Online calculator to quickly determine steam flow rate through a valve.
The formula will differ depending on the product the valve regulates, such as liquid, gas, or steam. The cv is defined as the flow rate of water in us gallons per minute that can pass through a valve with a pressure drop of 1 psi at a temperature of 60f. I'll typically look up the c1 as it varies depending on the type of control valve, conventional style globe valves are usually around 30 but it can be quite a bit lower It is actually possible to convert kv and cv and have the expression in the right unit for the calculation of interest.