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Series Mounted Valves, Cv 1

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cheaterbar

Electrical
Apr 3, 2008
6
New on this site and enjoying everyone's input.

I would like to know if there is a way to calculate the Cv of two series mounted valves ( Globe ) in combination. They are the same type of valve.

Would there be a different calculation for two different types of valves?

Thanks
 
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Hello Cheaterbar,

From a long time ago I can remember the following equation:

(1/Cv,total)^2 = (1/Cv,valve1)^2 + (1/Cv,valve2)^2

I hope this helps,
Terje
 
Terje61 is good.

It's analagous to resistors in series. Cv is conductance, so resistance is inversely related to conductance. And the math gets a little more fun because the resistance is proportional to Q^2

2 identical valves in series would have an effective net Cv of 0.707 (or 1/sqrt 2) times the Cv of either.
 
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