July 2007

Fluid Flow/Valves

Allowable liquid control valve pressure drops

Providing valve pressure drops at minimum, normal and maximum flows enables selecting the proper valve for the full operating range

Yu, F., Jacobs Engineering

In a previous article, the author stated the advantage of sizing control valves using the minimum allowable control valve pressure drop at maximum flow over other methods.1 In this article, more information is provided about the relationship between the allowable control valve pressure drop and the process system the control valve serves. Only liquid control valve allowable pressure drop is discussed. From an engineering design viewpoint, we hope to select a control valve that is able to regulate the process fluid in such a way that it is able to function over a desired flow range; a smaller valve can be used to reduce capital cost, and less pressure drop is consumed to reduce operating co

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