The Kv value expresses the amount of flow in a regulating valve at a given valve position with a pressure loss of 1 bar. The special situation with a fully open valve determines the Kvs value.
The amount of flow at a lower pressure loss can be calculated using the formula:
Kv = Q / √ΔP
Kv: Kv value [m³/h]
Q: Flow [m³/h]
ΔP: Pressure loss over regulating valve [bar]