Valve Authority Calculator

Enter the control valve’s pressure drop and the rest-of-circuit pressure drop (coil + piping + fittings) to see the resulting valve authority, its control-quality tier, and which valve type fits that result — using the same authority formula and three-tier scale referenced above.

Circuit Inputs

N = ΔP(valve) ÷ [ΔP(valve) + ΔP(circuit)]

Valve pressure drop, ΔP(valve) — kPa

Rest-of-circuit pressure drop, ΔP(circuit) — kPa Coil + piping + fittings pressure drop, excluding the valve itself

Result

Valve authority (N)

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Enter both pressure drops to see the control-quality tier and valve recommendation.

Directional guidance based on the authority formula and general engineering thresholds referenced on this page — exact breakpoints vary slightly by source and application. Confirm final valve selection with your Koven Air applications engineer.

Get a Valve Authority Review →