IEC 60534 compliant sizing with Cv calculations and flashing/cavitation analysis
Featured: Liquid Flow Sizing with Cv Calculations
Calculate Cv for liquid flow applications
1" Globe Valve
Cv ≈ 5-15
2" Globe Valve
Cv ≈ 20-50
2" Butterfly Valve
Cv ≈ 50-100
4" Butterfly Valve
Cv ≈ 200-400
Calculate Cv for gas flow applications
Choked Flow Status
Not choked
For gas flows, critical (choked) flow occurs when the pressure ratio reaches:
P2/P1 ≤ [2/(γ+1)]γ/(γ-1)
Choked flow limits the maximum flow rate through the valve.
Calculate Cv for two-phase flow applications
Two-phase flow calculations are complex and depend on:
This calculator uses the Homogeneous Equilibrium Model (HEM) for estimation. For critical applications, consult IEC 60534-8-3 standard.
Analyze cavitation in liquid flow applications
Cavitation occurs when local pressure drops below vapor pressure, forming vapor bubbles that collapse violently.
Severity levels:
This calculator follows IEC 60534 standards for control valve sizing, which provides internationally recognized methods for:
The valve flow coefficient (Cv) is defined as the flow of water at 60°F (15.6°C) in US gallons per minute (gpm) at a pressure drop of 1 psi across the valve.
The basic liquid flow equation is:
Cv = Q × √(SG/ΔP)
Where:
Cavitation occurs when the local pressure drops below the vapor pressure of the liquid, forming vapor bubbles that collapse when pressure recovers. This can cause:
