The Kvs value expresses the amount of flow in a regulating valve at a fully-open valve position and a pressure differential of 1 bar. The Kvs value is a special case of the Kv value, which indicates the flow at a given valve position and a pressure differential of 1 bar.
The flow at a lower pressure loss can be calculated by rearranging the equation:
Kvs = Q / √ΔP
Kvs: Kvs value [m³/h]
Q: Flow [m³/h]
ΔP: Pressure differential across a regulating valve [bar]