What is a CV?
CV is a flow coefficient which is really specking to the capacity of a valve.
If a valve has a CV of 20 that means we can pass 20 gallons of water per minute with one pound pressure drop.
CV is a measure of resistant to flow created by the valve.
we have sizing tables and formulas available for the calculation of CV.It is not a linear equation.
Valves with higher CV has less resistance to pressure
Free tools for Control Valve CV calculation.
Control Valve Sizing - Steam or Vapor Rev 2.xlsx (434.2 KB)
Control Valve Sizing - Liquid Rev 2a.xlsx (510.3 KB)
Control Valve Sizing - Gas Rev 2a.xlsx (476.7 KB)
More information and manuals can be downloaded from the following link