Valve Sizing Data

Cv Defined

Valve Cv is the industry standard for valve 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.

The Cv Values shown double with a 4 PSI drop

Valve Sizing

For 2-Position “ON-Off” Service, Select line size or 10% of Gauge Inlet Pressure for P.

For Modulating “Throttle Service”, Select 50% of Gauge Inlet Pressure or 5 PSI Minimum for P. A modulating valve can be line size and meet the pressure drop requirement by specifying the maximum disc opening.

Example—60% Maximum Disc Opening