When the system needs to implement program control or two position control, an electromagnetic valve is required. When selecting solenoid valves, in addition to considering AC and DC power sources, voltage, and frequency, attention must be paid to the relationship between the solenoid valve and the type of regulating action. If it is required to increase the relationship between the action types of solenoid valves and regulating valves, "normally open" or "normally closed" types can be used. If it is required to increase the capacity of the solenoid valve to shorten the action time, two solenoid valves can be used in parallel or combined with a large capacity pneumatic appliance as a pilot valve. The electromagnetic directional valve is equipped with a manual control device. In the event of a power failure or power outage, the adjusting screw can be turned with a screw knob to restore the pneumatic actuator and valve to their original positions.
1. Single electric control solenoid valve: The valve opens or closes when powered on, and closes or opens when powered off.
2. Dual electronic control solenoid valve: When one coil is energized, the valve opens, and when the other coil is energized, the valve closes, with memory function.