Standard Valves

Cv Defined

Valve Cv is the industry standard forvalve capacity or flow characteristic. Cv is defined by the maximum flow of 60 Deg water expressed in GPM which produces a one PSI pressure drop across the valve.

Valve Sizing

For 2-Position “ON-Off” Service, Select line size.

For modulating “throttle service”, Valve should be selected to take a pressure drop in the maximum open position. A modulating valve can be line size and meet the pressure drop requirement by specifying the maximum disc opening.

Example—60% Maximum Disc Opening

Formula For Fluids

Cv = Q G
P
Q = GPM P = Press. Drop
G = Specific Gravity