Why do pneumatic actuators have to be divided into single-acting and double-acting? When you understand a certain level of pneumatic actuator, you may wonder why the pneumatic actuator has only a single effect, since the pneumatic actuator opens and closes the Control Valve by ventilating and closing, depending on the user’s requirements, different solutions are required: when the pneumatic actuator is rotated to open the valve, when the valve is closed, the other side of the exhaust port can be closed, the cylinder reset, and when the air source is gone, the exhaust port can only remain in place; The pneumatic actuator opens the valve when the single acting pneumatic actuator is ventilated, closes the valve automatically when the air source is not ventilated, and when the single acting pneumatic actuator is automatically reset by the spring, generally used in dangerous situations, in case of gas loss or emergency, the single acting pneumatic actuator can be reset automatically to reduce the risk compared with the data transmission of flammable gas or flammable liquid.Single-acting pneumatic actuators are generally divided into normally open type and normally closed type, normally open type: Ventilation closed type, exhaust closed type, normally closed type, exhaust closed type, exhaust closed type, etc. , lower in function and use than single acting pneumatic actuator actuators and accessories: Pneumatic Valves Open and close position control pneumatic actuator. Spring Return Type: the valve opens or closes automatically when the return air circuit is cut off or fails. Single Electronic Control SOLENOID VALVE: Power Supply when the valve open or closed, power off when the valve closed or open (can provide explosion-proof) . TWO-COIL SOLENOID VALVE: One Coil provides power when the valve is open, the other coil provides power when the valve is closed, with memory function (explosion-proof type available) . LIMIT SWITCH TRANSPONDER: Remote Transmission Valve Position Signal (explosion-proof type available). Electric positioner: Medium Flow Control Valve, according to the current signal size (standard 4-20ma)(optional explosion proof) . PNEUMATIC POSITIONER: According to the pressure signal (mark 0.02-0.1 MPA) on the valve medium flow control. Electrical Converter: convert current signal into air pressure signal and use with pneumatic positioner (explosion-proof type can be provided) . Three parts of air source treatment: including air source pressure reducing valve, filter, oil mist, air source pressure stability, cleaning, lubricating function of moving parts. Manual Operation Mechanism: Automatic Control, can be operated manually under abnormal circances.