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Working principle of electromagnet controlled by solenoid valve

There are many kinds of solenoid valves. Different solenoid valves play the role of control system in different positions. The most commonly used ones are direct acting solenoid valve, pilot solenoid valve, one-way valve, safety valve, direction control valve and speed control valve.
Then we will talk about the working principle of the solenoid valve:
The solenoid valve has closed the cavity, opened a hole at different positions, each hole is connected with different oil pipes, in the middle of the cavity is a piston, two electromagnets are on both sides, it faces the magnet coil, which side of the electric body will be attracted, by controlling the valve to open or close the movement of different discharge oil holes, the oil holes will always be open, the hydraulic oil will enter different drain pipes, and then push through the oil pressure The piston of the moving cylinder, the piston drives the piston rod, and the piston rod drives the mechanism. It controls the mechanical movement by controlling the current break of the electromagnet.
The working principle of the solenoid valve can be divided into three categories
1. Move solenoid valve directly
Principle: when the normally closed type is energized, the electromagnetic force is generated by the electromagnetic coil, which lifts the open parts from the valve seat and opens the valve; when the power is off, the electromagnetic force disappears, and the spring presses the open parts on the valve seat to open the valve. (opposite to normally open)
Working principle of electromagnet controlled by solenoid valve
Features: it can work normally under vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25 mm.
2. Gradually move the solenoid valve
Principle: it is a combination of direct movement and pilot type. When there is no pressure difference between the inlet and outlet, it is electrified, and the electromagnetic force directly lifts the pilot valve and the closing parts of the main valve upward in turn, and the valve opens. When the inlet and outlet reach the start-up pressure difference, the small solenoid pilot valve is energized, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber drops, so that the main valve can be pushed upward by the pressure difference; when the power is off, the pilot valve uses spring force or medium pressure to push the closing part, and moves downward to close the valve.
Features: under zero pressure difference or vacuum condition, high pressure can also operate, but the power is large, so it must be installed horizontally.
3. Pilot solenoid valve
Principle: when the power is on, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber drops rapidly, forming a high pressure difference around the pilot hole. The fluid pressure pushes the open part upward and the valve opens. When the power supply is cut off, the spring force will open the pilot hole, and the inlet pressure will quickly form a low pressure and high pressure difference between the valve closing parts around the cavity through the bypass hole. The fluid pressure drives the opening parts to move downward to open the valve.
Features: small volume, low power consumption, high upper limit of fluid pressure range, optional installation (customized), but must meet the condition of fluid pressure difference.

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