Relief valve Excavator solenoid valve E320B control valve Main valve 6E-5933

   Relief valve is a hydraulic pressure control valve, which mainly plays the role of constant pressure relief, pressure regulation, system unloading and safety protection in hydraulic equipment. In the quantitative pump throttling regulation system, the quantitative pump provides a constant flow, when the system pressure increases, the flow demand will be reduced, at this time the relief valve is opened, so that excess flow back to the tank, to ensure that the relief valve inlet pressure, that is, the pump outlet pressure is constant. The relief valve is connected in series on the return oil circuit, and the stability of the moving parts of the back pressure of the relief valve is increased. The unloading function of the system is to connect the solenoid valve with a small overflow flow in series at the remote control port of the relief valve. When the electromagnet is energized, the remote control port of the relief valve passes through the fuel tank. At this time, the hydraulic pump is unloaded and the relief valve is used as a unloading valve. Safety protection function, when the system is working normally, the valve is closed, only when the load exceeds the specified limit, the overflow is opened, and the overload protection is performed, so that the system pressure is no longer increased.

Komatsu excavator Is valve working principle
The ls valve of Komatsu excavator refers to the flow control valve in the hydraulic system, which can control the flow and pressure of the liquid in the hydraulic system. In Komatsu excavators, the working principle of the 1s valve mainly includes two aspects, namely flow control and pressure control.
1. Flow control
Flow control foot controls the fluid flow in the hydraulic system by adjusting the opening of the 1s valve. When Komatsu excavator needs to adjust the speed of the hydraulic cylinder, the liquid flow can be controlled by adjusting the opening of the 1s valve, so as to achieve the speed control of the hydraulic cylinder. The ls valve controls the liquid flow area by adjusting the gap between the spool and the seat, thereby controlling the liquid flow.
2. Pressure control
Pressure control refers to controlling the working pressure of the hydraulic system by adjusting the pressure setting of the ls valve. In Komatsu excavators, the hydraulic system needs to maintain a certain working pressure to ensure that each hydraulic component can work normally. ls valve controls the pressure loss of liquid flowing through the valve core by adjusting the opening of the damping hole, so as to control the working pressure of the system.