August 2000

Special Report: Fluid Flow

Easy way to estimate realistic control valve pressure drops

Use this method to ensure proper operation and minimize operating costs

Yu, F., Jacobs Engineering

When designing a new plant or revamping an existing one, a key task is to estimate or calculate pressure drop allowed for each control valve. For a control valve that has a pump or compressor upstream, there are three methods to do this. The traditional method is to allow 50% to 25% of the system frictional pressure drop (other than control valve pressure drop) as the control valve pressure drop. The second method is to calculate the allowed control valve pressure per an equation proposed by Connell.1 The third technique is to assign a minimum pressure drop to the control valve at maximum design flowrate. This article st

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