The function of self-retaining solenoid valve, the working principle of self-retaining solenoid valve

The role of self-retaining solenoid valve

Self-maintaining solenoid valve is also called three-position center-sealing solenoid valve. There are three positions. The middle position seals all the air and naturally maintains the original position. It is generally used for power outage protection.

Working principle of self-retaining solenoid valve

A self-retaining type with a double pilot structure with mechanical self-locking memory function. When component coil "B" is energized, solenoid valve opens, and then is powered off. At this time, the solenoid valve is in a normally open state. When the component Coil "A" is energized, the solenoid valve is closed, and then de-energized, at which time the solenoid valve is in a normally closed state. If coils "A" and "B" are energized at the same time, the solenoid valve is in a normally open state and the coils will not burn out. This valve can be used in working environments with long switching cycles.

After coil A is energized, the solenoid valve is opened, and then deenergized, the solenoid valve remains open;after coil B is energized, the solenoid valve is closed, and then deenergized. power, the solenoid valve remains closed. The self-maintaining solenoid valve only needs to be powered on momentarily to complete the valve switching action, and the valve core position does not require electricity to maintain.

The solenoid valve has a closed cavity with through holes at different positions. Each hole leads to a different oil pipe. In the middle of the cavity is The valve has two electromagnets on both sides. Whichever side of the magnet coil is energized, the valve body will be attracted to that side. By controlling the movement of the valve body, it blocks or leaks different oil drain holes, while the oil inlet hole is normally open. , the hydraulic oil will enter different oil drain pipes, and then push the piston in the oil chamber through the pressure of the oil. The piston drives the piston rod, and the piston rod drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current of the electromagnet.

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