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# Water Control Valves - Flow Coefficient Cv Diagram

## Sizing of water control valves - Imperial units.

The flow coefficient Cv for a water control valve can be estimated with the diagram below:

### Example - Required Cv for a water control valve

With water flow 6 gpm and designed pressure drop 10 psi through a control valve - the required flow coefficient Cv can be estimated to ~2 as indicated in the chart below.

## Related Topics

• ### Control Valves

Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

## Related Documents

• ### Ball Valves - Flow Coefficients Cv

Flow coefficients - Cv - for typical ball valves - reduced and full bore.
• ### Butterfly Valves - Flow Coefficients Cv

Typical flow coefficients - Cv - for butterfly valves.
• ### Control Valves - Adding Flow Coefficients for Valves in Series or Parallel

How to add flow coefficients for control valves in series or parallel.
• ### Flow Coefficient Cv vs. Flow Factor Kv

Comparing flow coefficients Cv to flow factors Kv.
• ### Liquid, Steam and Gas - Flow Coefficients Cv

Calculate flow coefficients for the design of control valves - Imperial units.
• ### Liquids - Critical Pressure Ratios

Critical pressure ratios for water and other liquids.
• ### Steam Control Valves - Calculate Flow Factor Kv

Designing steam control valves and their Kv values.
• ### Straight Through Diaphragm Valves - Flow Coefficients

Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.
• ### Valve Authority

The valve authority expresses the ratio between pressure drop across the control valve compared to total pressure drop across the whole system.
• ### Water Control Valves - Flow Factor Kv Diagram

Sizing of water control valves - SI units
• ### Water Control Valves - Kv Calculation

Designing water process control valves and their Kv values.

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## Citation

• The Engineering ToolBox (2008). Water Control Valves - Flow Coefficient Cv Diagram . [online] Available at: https://www.engineeringtoolbox.com/water-valve-cv-diagram-d_326.html [Accessed Day Month Year].

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