Liquid Control Valve Cv Sizing
Calculate the flow coefficient (Cv) for liquid control valves per ISA/IEC 60534.
Liquid Control Valve Sizing Calculator Guide (PDF)
This calculator is used to size liquid control valves. The calculator determines the valve flow coefficient (Cv) required for a specified liquid flow rate and pressure drop. The calculator can handle non-flashing and flashing liquid flow. The calculation method is based on the International Electrotechnical Commission procedure described in the Emerson Control Valve Handbook.
The calculator can handle non-flashing, flashing and choked flow.
- Enter the mass flow rate of liquid the valve must pass
- Enter the pressures upstream and downstream of the valve
- Enter the fluid physical properties
- Enter the valve liquid pressure recovery factor
- This can be obtained from valve manufacturer's literature
- Typical values for globe valves range from 0.70 to 0.97
- Enter the piping geometry factor
- If no fittings are connected to the valve this factor is 1
- If fittings such as reducers are fitted to the valve the geometry factor can be calculated using the procedure described in the Liquid Control Valve Sizing Calculator Documentation
- Click the "Calculate" button
- The calculator will determine the valve Cv
- The calculator will also determine if the flow is critical or not through the valve
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