Flow coefficient
Revision as of 01:40, 14 December 2010 by Technician1002 (talk | contribs) (updated CV to include the definition and standard for measurement. A link to the Wikipedia page is added.)
The flow coefficient of a valve is a relative measure of its efficacy at allowing fluid flow. It describes the relationship between the pressure drop across an orifice and the corresponding flow rate.
There are two standards for valve CV. The most common is related to liquid flow and the volume of liquid that can pass the valve in Gallons per Minute for a 1 PSI pressure differential on the valve.
The other standard is for compressible gas.
Wikipedia has the formulas for the CV of valves. The CV for gas flow is most often needed for flow calculations in spudding.
Flow coefficient is the volume in US gallons of water in one minute that will through a valve with a pressure drop of 1 psi across the valve.
[1] Wikipedia page on CV.
