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Valve Authority

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

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valve authority

The valve authority can be expressed as

N = dpv / (dpv + dpc)         (1)

where

N = valve authority

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

dpc = 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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Related Topics

  • Control Valves - Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

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