In normal conditions (not limitated as in critical/cavitating/flashing cases) there is aButterfly Valves relation between flow and pressure drop and providing you get a curve CV/Aperture it shouldn't be difficult to calculate these values. However when there is a change of Bellows Seal Valvesphase, flow becomes critical , there is cavitation etc. etc. things are difficult to evaluate and really you should program a series of Check Valvesspecific tests for the different working cases, then you can attempt to correlate the results with some form of Plug Valves generic correlation (for example ISA formulation) by finding the paramters (FL etc.) which minimize theSafety Valves errors. As far as I know also manufacturers with large experience follow this way.

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