kv value
The kv value is the flow coefficient for valves, expresses flow rate in m³/h
of water with 1 bar pressure drop across valve. In the USA the Cv value is uses,
expresses flow rate in gal/min of water with 1 lb/sq in (1 kv = 0.86 Cv; 1 Cv =
1.17 kv).
Resistance coefficient = (0.05 A / kv)² A in mm²
The kv or Cv value is valid for water only. You can convert it for other
liquids in this way:
kv = flow rate x (density/pressure drop)^-2