Valve Authority

Valve authority express the ratio between pressure drop across the control valve compared to the total pressure drop across the whole circuit

The valve authority can be expressed as

N = dp_v / (dp_v + dp_c) (1)

where

N = valve authority

dp_v = pressure drop across a full open control valve (psi, Pa, bar)

dp_c = pressure drop across the circuit (psi, Pa, bar)

The valve authority should in general be in the range 0.2 to 0.5.

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