There is a closed cavity in the solenoid valve with through holes at different positions. Each hole leads to a different oil pipe. In the middle of the cavity is the valve. On both sides are two electromagnets. Which side of the magnet coil will be energized by the valve body. Where it is attracted, by controlling the movement of the valve body to block or leak out different drain holes, while the oil inlet hole is normally open, the hydraulic oil will enter the different drain pipes, and then the oil cylinder will be pushed by the oil pressure The piston drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical movement is controlled by controlling the current of the electromagnet.
Working Principle of Direct Acting Solenoid Valve
When energized, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; when the power is off, the electromagnetic force disappears, and the spring presses the closing member on the valve seat, and the valve closes.
Working principle of distributed direct-acting solenoid valve
It is a combination of direct-acting and pilot-acting principles. Normally closed type: When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly opens the pilot hole and the main valve is connected to the main valve after energization. The piston is lifted upwards and the valve opens; when the inlet and outlet reach the starting pressure difference, the electromagnetic force first opens the pilot The pressure in the upper cavity of the main valve piston drops, so that the main piston is pulled by the pressure difference and electromagnetic force, and the valve port opens; when the power is off, the pilot hole is closed by the spring reset, and the upper cavity of the main piston is pressurized to push the main piston down. The valve is closed. Normally open is the opposite of normally closed.
The working principle of the pilot solenoid valve
When the normally closed type is energized one by one, the electromagnetic force attracts the pilot hole spool, the pilot hole opens, and the pressure in the upper cavity of the main valve piston drops. The upper cavity and lower cavity of the main piston form an upper and lower cavity, so that the lower cavity pressure pushes the main valve. The piston opens the valve; when the power is off, the spring force resets and closes the pilot hole, the upper chamber of the main piston is pressurized, and the upper and lower chambers of the main piston form high and low pressures. The medium pressure and spring force push the main piston and the valve closes. Normally open is the opposite of normally closed.
Working principle of diaphragm solenoid valve
When energized, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, forming a high pressure difference around the closing member, the fluid pressure pushes the closing member to move upward, and the valve opens; when the power is off, the spring force closes the pilot hole , The inlet pressure passes through the bypass hole and the chamber quickly forms a low and high pressure difference around the valve closing member, and the fluid pressure pushes the closing member to move downward to close the valve.
Piston solenoid valve working principle
After the coil is energized, the movable iron core moves down due to the suction force, the auxiliary valve plug is pressed down, the auxiliary valve is closed, the pressure in the main valve cup rises, when the pressure rises to a certain value, the upper and lower pressure difference of the main valve cup is the same , Due to the electromagnetic force, the moving iron core loses the main valve under the cup, and the main valve seat is pressed and the valve is closed. When the coil is de-energized, the electromagnetic suction force is zero, the auxiliary valve plug and the supporting iron core are lifted up due to the action of the spring, the auxiliary valve opens, and the fluid on the main valve cup flows away through the auxiliary valve, reducing the effect on the main valve cup When the pressure on the main valve cup is reduced to a certain value, the main valve cup is pushed up by the pressure difference, the main valve opens, and the medium flows.
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