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Introduce the working principle and analysis of the three categories of electromagnetic valves

Electromagnetic valve is an automatic basic component used to control fluids. It is an actuator. It is a valve that drives the active iron core to open and close the valve flap by electromagnetic force generated by the power supply coil. It is an electromagnetic control industrial device used in industrial control systems. Adjust the media's direction, flow rate, speed, and other parameters. From the principle can be divided into three categories (direct-acting, distributed direct-acting, pilot-type).
The
A direct-acting solenoid valve:

Principle: When the power is turned on, the electromagnetic coil generates an 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. The spring presses the closing member against the valve seat and the valve closes.

Second, the distribution of direct-acting solenoid valve:

Principle: It is a combination of direct acting and pilot type. When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closing part and the valve opens. When the inlet and outlet reach the starting differential pressure, after the power is turned on, the electromagnetic force leads the small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber decreases, thereby pushing the main valve upwards by utilizing the pressure difference; when the power is off, the pilot valve utilizes the spring. Force or medium pressure pushes the closure and moves it downwards to close the valve.

Third, pilot solenoid valve:

Principle: When the power is turned on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the upper part is formed around the closing part. The fluid pressure pushes the closing part to move upwards and the valve opens; when the power is turned off, the spring force leads the pilot. The hole is closed and the inlet pressure quickly bypasses the chamber to form a lower, upper high pressure differential around the valve closing member. The fluid pressure pushes the closing member downward and closes the valve.

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