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.
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