All toolsCalculatorsMechanicalControl Valve Sizing (Kv)
Control Valve Sizing (Kv)
Size a liquid control valve: required Kv, recommended Kvs and valve authority (IEC 60534 / Spirax).
The Ensign ToolboxControl Valve Sizing (Kv)Size a liquid control valve: required Kv, recommended Kvs and valve authority (IEC 60534 / Spirax).
Flow & valve
m³/h
1 L/s ≈ 3.6 m³/h for water
bar
Fully-open valve drop at design flow — HVAC two-way 0.2–0.4 bar
G
Water = 1.0; glycol mixes slightly > 1
Circuit (for authority)
bar
Coil + balancing valve + branch pipework at design flow, excluding the control valve
Enter flow, valve ΔP and circuit ΔP to size the control valve