Calculate the required flow coefficient (Cv and Kv) for control valve sizing from your flow rate and pressure conditions, for liquid or steam service.
Volumetric flow in cubic metres per hour (m3/h).
Water = 1.0. Enter fluid specific gravity relative to water.
Mass flow in kg/h.
Absolute inlet pressure in bar.
Absolute outlet pressure in bar.
Cv is the flow coefficient: the flow of water in US gallons per minute at 60 deg F that passes through a valve with a 1 psi pressure drop. These formulas are simplified and assume turbulent, non choked flow for liquids and a standard steam relation. Use for preliminary sizing only. For final control valve sizing, full ISA/IEC methods accounting for choked flow, piping geometry, and Fk factors should be applied. Contact us for detailed sizing.
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