March 2008

Misc

Allowable vapor control valve pressure drops

Understand the relationship between the pressure drop and the process system

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 it serves. Only vapor control valve allowable pressure drop is discussed. From an engineering design viewpoint, we want to select a control valve that is able to regulate the process fluid over a desired flow range, a smaller valve control valve to reduce capital cost and less control valve pressure drop to reduce operating cost. The control valve is part of a process system. It

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