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Flow Coefficient Kva (valves)
- Thread starter zoon
- Start date
Tremolo
Nuclear
- Feb 26, 2003
- 77
Zoon,
I usually see the flow coefficient for a valve represented by the symbol Cv, so I googled Kvs and found a decent link:
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.
I usually see the flow coefficient for a valve represented by the symbol Cv, so I googled Kvs and found a decent link:
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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