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Flow Coefficient Kva (valves)

Flow Coefficient Kva (valves)

Flow Coefficient Kva (valves)

(OP)
The flow coefficient Kvs is the actual or stated Kv value of a particular valve when fully open. What is the flow coefficient Kva?

RE: Flow Coefficient Kva (valves)

Zoon,

I usually see the flow coefficient for a valve represented by the symbol Cv, so I googled Kvs and found a decent link: http://www.eurotherm.com/products/valves/size_water.htm

This link states that Kvs is the metric equivalent of Cv.  Specifically, the link states that Kvs is the flow m^3/hr per 1 bar (100 kPa) pressure difference.  Flow can be calcualated as,

m^3/hr = kvs * sqrt(dP)

where dP is the pressure difference in bar.

Are there any units for your Kvs values?


I have also seen the equation written as

m^3/hr = kvs * sqrt(dP * rhoref/rho)

to account for fluids at different temperatures where rhoref is the cold water reference density (1000 kg/m3) and rho is the actual water density.
 

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