Control Valve Positioner, 0-90°, 4-20 mA DC, 0 to 0.7 MPa

Product Name: Control Valve Positioner
Input Signal: 4-20 mA DC
Input Impedance: 250 Ω ± 5%
Gas Source Pressure: 0.14 MPa to 0.7 MPa (140 kPa to 700 kPa)
Output Pressure: 0 to 0.7 MPa (0 to 700 kPa)
Angular Stroke: 0 to 90°
Air Consumption: at 50% output pressure

Based on their structure, valve positioners can be classified into pneumatic valve positioners, electro-pneumatic valve positioners, and intelligent valve positioners. They are essential accessories for control valves, typically used with pneumatic control valves. A valve positioner receives the output signal from a regulator and converts it into a corresponding output signal to control the pneumatic control valve. Through a feedback mechanism, the valve stem displacement is sent back to the positioner, which then transmits the valve position status to the upper control system via an electrical signal.

Technical Parameters

» Control type: Single-acting / Double-acting
» Input signal: 4–20 mA DC
» Input impedance: 250 Ω ± 5%
» Output characteristics: Proportional to input signal
» Supply air pressure: 0.14–0.7 MPa (140–700 kPa)
» Output pressure: 0–0.7 MPa (0–700 kPa)
» Angular stroke: 0–90°
» Air consumption at 50% output pressure:
• Single-acting: at 140 kPa → 5 Nl/min  
• Double-acting: at 400 kPa → 15 Nl/min  
» Maximum air consumption:
• Single-acting: at 140 kPa → 175 Nl/min  
• Double-acting: at 400 kPa → 400 Nl/min