Electro-hydraulic directional control valve is composed of electromagnetic directional control valve and hydraulic directional control valve, in which the electromagnetic directional control valve is used to change the direction of flow to the hydraulic directional control valve to change the working position of the valve core. Call it the pilot valve; Hydraulic changeover valves are used to control actuators in hydraulic systems. This kind of control mode can control the direction of large flow in the main oil circuit by using the suction force of small electromagnet, which is suitable for the hydraulic system with large flow.

Electro-hydraulic directional control valve of the main valve core to spring to neutralize how the hydraulic pressure in two ways, elected in spring, the guide valve should choose function of Y type electromagnetic directional valve, to ensure that when the main valve core in the median, on both ends of the control oil chamber of hydraulic oil to the fuel tank keep in unloading condition, easy to keep the main valve core in the middle position. When using hydraulic pressure, the pilot valve should choose the P type electromagnetic directional valve, to ensure that the main valve core in the middle, the two ends of the hydraulic control oil, the main valve core pressure balance at both ends, keep in the middle.

The control oil inlet mode of the electro-hydraulic directional control valve is divided into internal oil inlet and external oil inlet, and the oil return mode also has internal oil return and external oil return, which can be flexibly selected according to the actual needs of the system.