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ABOUT Cv (FLOW COEFFICIENTS) - Welcome to …
ABOUT Cv (FLOW COEFFICIENTS) DOC: FNWA boutCv Ver. 3/2012 2012 - FNW. All rights FNW logo is a trademark of Ferguson Enterprises, Inc., PL Sourcing, PO Box 2778, Newport News, VA 23609 for FLUIDSCv for liquids is the volume of 68 F water in gallons per minute that passes through a valve at a pressure drop of 1 PSI. Flow for a given Cv is typically calculated from the following : Q = Valve flow rate in gallons per minute (US GPM) P = Difference between upstream and downstream pressure in pounds per square inch (PSI) = Conversion factor for fluids computed in relation to water D = Density of fluids in pounds per cubic footQ = Cv x P x DThe formula above utilizes a conversion factor of which is the density of water in lbs/ft . The following formula is often used using a fluid s specific gravity (G) where the relationship to water density is already = Cv x P GLikewise, Cv for particular flow characteristics can be determined from this formula:Cv = Q x G PKv = Q x D 1000 x PSimilar formulas are available using metric units:Q = Kv x P x 1000 DQ = Kv x P GKv = Q x G PWhere: Q = Valve flow rate in cubic meters per hour (m /h) P = Difference between upstr
ABOUT Cv (FLOW COEFFICIENTS) DOC: FNWAboutCv Ver. 3/2012 © 2012 - FNW. All rights reserved. The FNW logo is a trademark of Ferguson Enterprises, Inc., PL Sourcing, PO Box 2778, Newport News, VA 23609 www.fnw.com
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