Working principle of hydraulic system

The principle is as follows: the hydraulic oil in the oil tank is filtered by the filter into the double pump 1. The high pressure oil produced by the double pump enters the one-way valve on both sides and starts the reversing valve 4. When the valve does not act in the middle position, it is in the zero position, so the pressure oil flows out of the oil return port of the manual reversing valve and returns to the oil tank through the oil return pipe. At this time, the system is unloaded, the oil pump has no load, and the pressure of the hydraulic oil only needs to overcome the resistance of the pipeline and the valve.