Experts, how is the formula for calculating the CV value of a control valve determined? Solve! Waiting online. . . .
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Experts, how is the formula for calculating the CV value of a control valve determined? Solve! Waiting online. . . .
Now many people use software to do it; it’s more convenient and simpler that way
There are many methods; calculate according to the manual, and there is also a quick calculation method
May I ask which source this comes from? Looking forward to your advice
May I ask how to determine the pressure before and after this valve? Can the pressure before the valve be considered as the normal operating pressure? Is the pressure behind the valve the operating pressure minus the valve pressure drop? How is this pressure drop determined? Manufacturer data? Adjustment target?
For reference: GB/T 17213.2-2005 Industrial-process control valves – Part 2-1: Flow capacity; Formulas for calculating fluid flow under installed conditions (latest version: GB/T 17213.2-2017). The corresponding international standard is IEC 60534-2-1-2011 (cor 2015): Industrial-process control valves – Part 2-1: Flow capacity; Formulas for calculating fluid flow under installed conditions
The forum contains control valve manuals by Fisher and Masoneilan, which include detailed calculation formulas if you want to study the theory. If you don’t want to, find a pre-made calculation software and use it to do the calculation.