Hydraulic valves are divided into check valves and reversing valves according to their uses. One-way valve: Only allow the fluid to be connected in one direction in the pipeline, and cut off in the reverse direction. Reversing valve: change the on and off relationship between different pipelines. According to the working position of the spool in the valve body, it can be divided into two, three, etc.; according to the number of channels to be controlled, it can be divided into two-way, three-way, four-way, five-way, etc.; according to the spool drive mode, it can be divided into manual, motorized, electric , Hydraulic etc. Figure 2 shows the working principle of the three-position four-way reversing valve. P is the oil supply port, O is the oil return port, and A and B are the output ports leading to the actuator. When the spool is in the neutral position, all oil ports are cut off, and the actuator does not move; when the spool is moved to the right position, P is connected to A, and B is connected to O; when the spool is moved to the left position, P and B are connected Pass, A and O pass. In this way, the actuator can move forward and backward.
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