Fluidics calculator: Kv value, flow rate and pressure drop

Calculate the required Kv value, the flow rate or the pressure drop of a valve for liquids and gases. The calculation follows the simplified standard formulas (IEC 60534) and is suited for an initial sizing.

What do you want to calculate?

Medium

Density (kg/m³, for gases at standard conditions)

Flow rate (m³/h)

Kv value (m³/h at 1 bar)

Pressure drop Δp (bar)

Inlet pressure p1 (bar gauge)

Temperature (°C)

Pipe inner diameter (mm)

Equivalent Cv value

Flow velocity in the pipe

Guide values based on simplified IEC 60534 formulas: liquids Kv = Q · √(ρ/1000 / Δp), gases (subcritical) Qn = 514 · Kv · √(Δp · p2 / (ρn · T)). Viscosity, cavitation, flashing, pipe losses and installation factors are not taken into account. Gas velocity refers to the inlet condition. Contact us for an exact sizing. Non-binding.

The Kv value states how much water (m³/h) flows through the valve at 1 bar pressure drop. Suitable valves can be found in our solenoid valves and process and control valves. Contact us and we will size the valve together with you.