The QT800 series of intelligent valve positioners receive 4~20mA DC current signals from the control room or current output devices such as signal generators, adjust the air pressure input to the valve actuator, and precisely control the valve opening in proportion. 

Features include:

- LCD screen and 4 buttons

- Quick and easy automatic setting

- Partial stroke test function (PST)

- Fault alarm function

- Built-in automatic/manual switch knob

- Self-diagnostic function

- IP66/NEMA4X protection rating

- Large flow pilot valve for faster valve response

- Shock-resistant and vibration-proof design