Abroad, the flow coefficient often expressed in Cv, the definition of the conditions and domestic different. Cv is defined as the number of gallons per minute flow through the regulator per minute when the regulator is fully open, the pressure differential ΔP across the valve is 1 pound per inch², and the medium is 60 ° water. Due to the different definitions of Kv and Cv, the values ​​measured in the experiment are different, and the conversion relation between them is: Cv = 1.167Kv
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