Water Control Valves - Flow Coefficient Cv Diagram
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 Valve Sizing
Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.
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.