Working principle of solenoid valve

The two-position three-way solenoid valve is usually used in conjunction with a single-acting pneumatic actuator. The two positions are controllable in two positions: on-off. The three-way has three channels for ventilation. Generally, one channel is connected to the air source, and the other two One channel is connected to the intake port of the actuator, and one is connected to the exhaust port of the actuator. The specific working principle can refer to the work of the single-acting pneumatic actuator. The original two-position three-way solenoid valve is usually connected with the single-acting pneumatic actuator. For supporting use, the two positions are controllable in two positions: on-off. The three-way has three channels for ventilation. Generally, one channel is connected to the air source, and the other two channels are connected to the air inlet of the actuator. One is connected to the exhaust port of the actuator. For the specific working principle, please refer to the working principle diagram of the single-acting pneumatic actuator. The two-position five-way solenoid valve is usually used in conjunction with a double-acting pneumatic actuator. The two-position is controllable in two positions: on-off. The five-way valve has five channels for ventilation, of which one is connected to the air source, and two are connected to the double The inlet and outlet ports of the outer chamber of the acting cylinder are connected, and the two are connected with the inlet and outlet ports of the inner chamber. The specific working principle can refer to the working principle of the double-acting pneumatic actuator. In the gas circuit (or liquid circuit), the two-position three-way solenoid valve has 1 air inlet (connected to the air source), 1 air outlet (provided to the air source of the target device), and 1 exhaust hole ( Generally install a muffler, if you are not afraid of noise, you can also not install @_@). The two-position five-way solenoid valve has 1 air inlet (connected to the air source), 1 positive-acting air outlet and 1 counter-acting air outlet (respectively provided to the target device with a positive and negative air source), 1 One positive action exhaust hole and one reverse action exhaust hole (with muffler installed). For small automatic control equipment, the air pipe is generally 8~12mm industrial rubber air pipe. Solenoid valves are generally selected from Japanese SMC (high-end, but small Japanese products), Taiwan Airtac (affordable, good quality) or other domestic brands, etc. Electrically speaking, the two-position three-way solenoid valve is generally single-controlled (ie, single coil), and the two-position five-way solenoid valve is generally double-controlled (ie, double coil). The coil voltage level generally adopts DC24V, AC220V, etc. Two-position three-way solenoid valve is divided into two types: normally closed type and normally open type. Normally closed type means the air circuit is broken when the coil is not energized, and normally open type means the air circuit is open when the coil is not energized. Principle of operation of normally closed two-position three-way solenoid valve: When the coil is energized, the gas circuit is connected, once the coil is de-energized, the gas circuit will be disconnected, which is equivalent to 'jogging'. Principle of operation of normally open two-position three-way single electric control solenoid valve: When the coil is energized, the gas circuit is disconnected. Once the coil is de-energized, the gas circuit will be connected, which is also 'jogging'. Operation principle of two-position five-way dual electronically controlled solenoid valve: when the positive-acting coil is energized, the positive-acting gas circuit is connected (the positive-acting vent has gas), even if the positive-acting coil is powered off, the positive-acting gas circuit is still connected , It will be maintained until the reaction coil is energized. When the reaction coil is energized, the reaction gas circuit is connected (there is air in the reaction vent), even if the reaction coil is powered off, the reaction gas circuit is still connected, and it will be maintained until the positive operation coil is energized . This is equivalent to 'self-locking'. Based on this feature of the two-position five-way dual electronically controlled solenoid valve, when designing the electromechanical control loop or programming the PLC program, the solenoid valve coil can be operated for 1 to 2 seconds, so as to protect the solenoid valve coil from damage. .