Cv Calculation For Butterfly Valve. In the results area the output of the valve sizing is summarized into three sections (figure 1.13): Although both valves have the same flow capacity (cv), the graph of flow through the butterfly valve (red line on the left hand graph) looks quite different than the graph of flow through the globe valve.
The formula below allows for calculation of flow rate and pressure drop through a valve with a specified cv value. Chapter 1 offers an introduction to control valves,. If this valve is connected to a 125 psig air line, find the pressure loss through it when it is passing a flow of 243 scfm.
The valve flow coefficient (c v) is a convenient way to represent flow capacity of a valve across a range of fluids and process parameters.the c v calculator will calculate either c v or flow using the supplied additional parameters of fluid, inlet and outlet.
A 4 inch high performance butterfly valve operating at around 70% open would also have a cv of about 250. Control valve cv calculation in deciding the size of the control valve that (port size) we need to calculate the cv value of the process (calculated cv) by calculating cv has educated more than 50 years, which is involved in. Butterfly valves are available in sizes up to 20 in. 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:.
