Solenoid valve is an industrial device controlled by electromagnetism. It is usually used in industrial control systems to adjust the direction, flow rate, speed and other parameters of the medium. It can cooperate with different circuits to achieve expected control, and the control accuracy and flexibility can be guaranteed.

The working principle of the solenoid valve is that when the solenoid valve is energized, the solenoid coil generates a magnetic field that attracts the magnetic material (usually iron filings) in the iron core, which causes the iron core to be discharged, thereby cutting off the power supply. When the solenoid valve is powered off, the magnetic field disappears, the armature is attracted, and the valve is closed by spring return.

There are many types of solenoid valves, and different types have different characteristics. For example, when the direct-acting solenoid valve is energized, the solenoid coil generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; when the power is turned off, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, and the valve closes. The step-by-step direct-acting solenoid valve is based on the principle of combining direct-acting and pilot-operated. When there is no pressure difference between the inlet and outlet, after power is turned on, the electromagnetic force directly lifts the pilot small valve and main valve closing parts upward in sequence, and the valve opens. . When the inlet and outlet reach the starting pressure difference, after power is turned on, the electromagnetic force pilots the small valve. The pressure in the lower chamber of the main valve increases and the pressure in the upper chamber decreases, thereby using the pressure difference to push the main valve upward.

In general, the characteristics and applications of solenoid valves vary depending on the type and purpose. They are widely used in various industrial control systems and fluid control equipment.