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CV and KV Calculator

Enter Flow Enter Differential Pressure of the coil
If unsure, use:
5 PSI for heating
3 PSI for cooling

Actual Differential Pressure Calculator

Choose Cv or Kv Enter Flow Actual Differential Pressure Results

* Flow is entered in the Cv Calculator Window

Valve Authority

Your Valve Authority is XXXX, ideally valve authority should be between 0.5 and 0.7 but never less than 0.3

Authority is generally expressed by the symbol "N" where:


P1 = pressure drop across the valve fully open
P2 = pressure drop in remainder of the circuit, valve fully open

A typical circuit is shown diagrammatically below. In order to maintain reasonable control without undue pressure drop the value of "N" should be ideally between 0.5 and 0.7 but never less than 0.3.

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