Usually integrally connected by a rotary valve actuator (0 ~ 90 ° part-turn) by mechanical, composed after installation.

Classification according to the operation modes: switching and modulating.

Switching is directly connected to the power supply (AC220V power or other power level) through the switch positive, always complete ABM switching operation.

Is regulated AC220V power as power, industrial automation and control system receives the preset parameter value 4 ~ 20mA (0 ~ 5 such as weak control) signal to complete the adjustment operation.