Rated Cv of Valve

[Sid89]

Hello everyone. I am new to the Valve Engineering profession. I would like to know:

How to calculate the rated Cv of a valve with a full port ball and V-port ball?

I need to know the mathematical/analytical method of calculating the rated Cv.

Thanks,

Syed

 

[RVAmeche]

Cv is a measure of flow rate (GPM) of 60F water at various positions of valve travel.

The method is an empirical test via installing the valve in a flow rig and running the test.

 

[LittleInch]

http://www.idealvalve.com/pdf/Flow-Calculations-for-Liquids.pdf

Control valve vendors have various bespoke tools to allow then to develop different CV for different sizes etc.

They would be based on certain actual tests,

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