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What is the working principle of the gas solenoid valve?

The first type: When the solenoid valve coil is energized, the solenoid valve is opened. At this time, the magnetic switch input source is in contact with the output open contact, the input source and the output close contact are disconnected, and the coil keeps the energized solenoid valve in an open state; When the valve coil is de-energized, the solenoid valve is quickly closed. At this time, the magnetic switch input source and the output close contact are turned on, and the input source and the output close contact are disconnected.
Second: When the solenoid valve coil is energized, manually open the solenoid valve, the solenoid valve opens, (the solenoid valve coil consumes 20W, can be energized for a long time), and the valve maintains the long-term energization state. At this time, the magnetic switch input source and output are open. When the contact is closed, the input source and the output close contact are disconnected. When the power is cut off or the power is lost, the solenoid valve is quickly closed. At this time, the magnetic switch input source and the output close contact are turned on, and the input source and the output open contact are disconnected.
The third type: when the solenoid valve needs to be opened, it is not energized, and the valve is opened manually, and the valve is kept open. At this time, the magnetic switch input source is connected to the output open contact, and the input source is disconnected from the output close contact; when it needs to be closed When the valve is energized, the solenoid valve is quickly closed after being energized. (The valve coil cannot be energized for a long time, and the energization time is preferably within 10 seconds.) At this time, the magnetic switch input source and the output close contact are connected, and the input source is disconnected from the output open contact. .

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