How do I calculate Pneumatic Valve Sizing (Cv/Kv)?

To calculate Pneumatic Valve Sizing (Cv/Kv): Enter Required flow Q, Upstream pressure P1, Downstream pressure P2 and other values. Click Calculate. INDUGRID computes the result instantly using the formula: Cv = Q / (963 × P1 × √(ΔP/P1)) for subcritical flow (ΔP/P1 < 0.53). No registration required.

What units does the Pneumatic Valve Sizing (Cv/Kv) calculator use?

The Pneumatic Valve Sizing (Cv/Kv) calculator uses the following units: nl/min, bar, °C. SI units are used by default.

Is the Pneumatic Valve Sizing (Cv/Kv) calculator free?

Yes. The INDUGRID Pneumatic Valve Sizing (Cv/Kv) calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Pneumatics

Pneumatic Valve Sizing (Cv/Kv)

Calculate the required Cv/Kv flow coefficient for a pneumatic valve based on required flow, upstream pressure and allowable pressure drop.

Units:

in LinkedIn

💡Always size valves 20–30% larger than the calculated minimum Cv. A valve running at 100% Cv is fully open with no control authority. For proportional valves, target 60–80% open at design flow for best control.

Cv = Q / (963 × P1 × √(ΔP/P1)) for subcritical flow (ΔP/P1 < 0.53)

Input

Required flow Q iRequired flow through the valve in normal-litres per minute.

nl/min

Upstream pressure P1 iGauge pressure upstream of the valve in bar.

bar

Downstream pressure P2 iGauge pressure downstream of the valve in bar.

bar

Air temperature iTemperature of the compressed air in °C.

°C

Result

Pressure drop ΔP [bar] —

P2/P1 ratio —

Flow type —

Required Cv —

Required Kv (m³/h) —

Recommended minimum Cv (+25%) —