Flow Coefficient Kv Calculator
Calculate the metric flow coefficient Kv and its equivalent Cv for liquid service valves.
How to Use the Flow Coefficient Kv Calculator
- Enter the required flow rate in m³/h.
- Enter the fluid density in kg/m³ (1000 for water).
- Enter the pressure drop across the valve in bar.
Cas d'utilisation
- •Sizing metric control valves in European process plants.
- •Converting between Kv and Cv for international valve specifications.
- •Checking valve authority in HVAC hydronic systems.
Formule
Kv = Q × √(ρ/1000 / ΔP), where Q is flow (m³/h), ρ is density (kg/m³), ΔP is pressure drop (bar). Cv = Kv × 1.156.
Questions fréquemment posées
What is the difference between Kv and Cv?
Kv is the metric flow coefficient (m³/h at 1 bar drop for water). Cv is the imperial equivalent (GPM at 1 psi drop for water). Cv ≈ Kv × 1.156.
What density should I use for water?
Use 1000 kg/m³ for water at ambient temperature. For hot water or other liquids, use the actual density.
Is this calculator free?
Yes, all OhMyCalc calculators are completely free to use.