Why control valve flow coefficient Cv is importance ? | How to calculate Cv ? | Is higher Cv better?

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Why control valve flow coefficient Cv is importance ?
How to calculate Ov ?
Is higher Cv better ?
Factors affecting the cv value of a control valve
CV IN CONTROL VALVE SIZING AND SELECTION

[@balajiarni]

Excellent Video with enormous content and information on control valve Cv.

[@akankshasharma9000]

Why 60 farenheight is only considered ?