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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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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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