[Ether]

Originally Posted by Matt H.

Cv is not unitless. The Cv of a valve is the "flow rate in US Gallons per minute [gpm] of water at a temperature of 60 Fahrenheit with a pressure drop across the valve of 1 psi."

Source: http://www.valvias.com/flow-coefficient.php

Also see:
http://en.wikipedia.org/wiki/Flow_coefficient

Great teaching stuff Matt. Thanks. I was looking for some nice graphs to show my team of airflow (either mass airflow or scfm) versus pressure drop for various Cv values, but was unsuccessful.

Just wondering if maybe you had found some and could share the links.


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