Control Valve Sizing
Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.
| Parameter | Unit | Description | Typical Range |
|---|---|---|---|
| Cv (Flow Coefficient) | gpm/√psi | Flow capacity in US gallons per minute at 1 psi pressure drop | 0.01 - 1000 |
| Kv (Flow Coefficient) | m³/h/√bar | Flow capacity in cubic meters per hour at 1 bar pressure drop | 0.001 - 100 |
| Flow Rate | gpm or m³/h | Actual fluid flow rate through the valve | Variable |
| Pressure Drop | psi or bar | Pressure difference across the valve | 0.5 - 50 |
| Valve Authority | Dimensionless | Ratio of pressure drop across valve to total system pressure drop | 0.25 - 1.0 |
| Noise Level | dB | Sound pressure level generated by the valve | 60 - 90 |
| Actuator Size | Various | Pneumatic or electric actuator capacity | Depends on valve type |
| Rangeability | Dimensionless | Ratio of maximum to minimum controllable flow | 20:1 - 100:1 |
| Pressure Rating | psi or bar | Maximum design pressure for the valve body | 150 - 10000 |
| Temperature Rating | °C or °F | Operating temperature range | -50 to 500°C |