Valve Cv Si Units. In europe the valve flow coefficient is called kv. Cheval vapeur centivolt ›› si unit:
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Symbol description units (notes) a flow passage area at the actual valve stroke mm2 c v flow coefficient u.s. In simple terms, a fully open control valve with a cv of 14 usgpm/psi passes 14 usgpm of fluid with 1 psi pressure drop. Cv is the flow coefficient in imperial units.
The cv was designed for use with liquid flows, it expresses the flow in gallons per minute of 60º f water with a pressure drop across the valve of 1 psi.
Flow coefficient is an imperial measurement and is defined as: In metric units, the same valve with cv = 1 pass 0.864 m3/hr. Symbol description units (notes) a flow passage area at the actual valve stroke mm2 c v flow coefficient u.s. The coefficient of flow (cv) is a formula which is used to determine a valve’s flows under various conditions and to select the correct valve for a flow application.
