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Swagelok Central Ontario

Your Authorized Swagelok Sales and Service Center

Cv Calculator for Valve Sizing

This calculator can be used to help select a valve with enough flow capacity for a given application. The valve flow coefficient (Cv) is a convenient way to represent flow capacity of a valve across a range of fluids and process parameters. The Cv calculator will calculate either Cv or flow using the supplied additional parameters of fluid, inlet and outlet pressure, and fluid temperature. The calculations can be performed for either liquid or gas flow. Choosing a valve with a Cv value sufficiently larger than the calculated Cv will help provide expected flow performance.

Gas pressure units are in absolute pressure, except for PSIG.

Safe Product Selection: When selecting a product, the total system design must be considered to ensure safe, trouble-free performance. Function, material compatibility, adequate ratings, proper installation, operation, and maintenance are the responsibilities of the system designer and user.

For additional information or resources:

CV Calculator
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For an accurate pressure reading, P1 Should be greater than P2.
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CV Value:

Flow Value:

Please enter a temperature.

Please enter values for pressure P1 and pressure P2.

Cv must be entered when calculating flow.

Flow must be entered when calculating Cv.

No flow exists for these pressure values.