Example: which
valve is needed to deliver 2,2 m3/h of water with free
exhaust and head of 5,5 mH2O?
Solution: consulting the chart, start from H = 5,5 on the abscissa and Q = 2,2 on the ordinate, the point of intersection is on
the line Kv = 3. Thus, the valve must have a Kv = 3.
Q =
flow rate in m3/h Dp = pressure drop in mH2O Kv = flow factor