The value Cv is the flow rate of Pure
water at 60°F passing through the valve
when the disc is fully opened and the
differential pressure between the two
ends of the valve is 1Lbf/in2 .
V: Max.flow (in US gal/min)
G: Specific gravity (1 for water)
ΔP: Differential Pressure in valve (Lbf/in2)
Cv = 1.17 Kv
The value Kv is the flow rate of Pure water at 15°C passing through the valve when the disc is fully opened and the differential pressure between the two ends of the valve is 1 bar.
Q: Max.flow (m3/h)
G: Medium density (g/cm3) (1 for water)
ΔP: Differential Pressure in valve (100Kpa) i.e.(bar)
Kv = 0.855 Cv
