1. When the electromagnet is energized, it will generate a magnetic field to attract the spool to move in one direction.

2. When the valve core moves, the valve core is attracted by the electromagnet and moves in one direction to make the hydraulic oil flow or cut off.

3, hydraulic oil circulation or cut-off, when the valve core moves to a certain position, it will make the hydraulic oil circulation or cut-off, so as to realize the control of the hydraulic system.