. Double acting actuator: controls the opening and closing of the valve
. Single acting actuator (spring return): When the circuit is off or faulty, the actuator automatically turns off or automatically opens the valve
. Dual control solenoid valve: When a coil is energized, the valve opens. the valve is closed when the other coil is energized, there is memory function (for explosion-proof type)
. Limit switch (return device): long-distance transmit signal when valve is open or closed (for explosion-proof type)