How to Size a Control Valve for Liquid Flow

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Learn more about sizing control valves for liquid flow and the steps that go into the process for proper sizing. This video is a step-step procedure for the sizing of control valves for liquid flow using the ISA and IEC procedure. Each of these steps is important and • must be considered during any valve sizing procedure. • 1. Specify the variables required to size the valve as follows: • Desired design • Process fluid (water, oil, etc.), and • Appropriate service conditions • q or w, P1, P2 or ΔP, T1, ρ1/ρo, Pv, Pc, and ν • 2. Determine the equation constants, N1 and N2. • 3. Determine FP, the piping geometry factor, and FLP, the liquid pressure recovery factor adjusted for attached fittings. • 4. Determine the pressure drop to use for sizing, ΔPsizing. • 5. Calculate Cv. If this Cv value is not close to the estimate used in step 3, iterate using • this new Cv value and the corresponding FL from the product information. • Additional Resources: • – Control Valve Handbook https://www.emerson.com/documents/aut... • Thanks for watching! Please like, share, and comment on our video and make sure to subscribe to the Fisher Valve Instruments channel.

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