I have a question regarding control valves
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Hello, everyone! To calculate the CV value, it is necessary to know the pressure difference before and after the valve. Is this pressure difference the one when the valve is fully open or when it is closed? Is the CV value a parameter used for calculating the nominal diameter of control valves, or is it a parameter used for calculating the valve seat of control valves? What parameters are needed to choose the size of a cylinder? Thank you!
The differential pressure value refers to the values under three conditions: maximum flow rate, normal flow rate, and minimum flow rate; however, it is generally the differential pressure value under normal operating conditions as specified by the process. The selection of cylinders is based on factors such as the unbalanced force, the closing pressure difference, and friction