Hydraulic balance valve Excavator hydraulic cylinder spool CBEA-LIN

The main function of the relief valve

Constant pressure overflow effect: In the quantitative pump throttling regulation system, the quantitative pump provides a constant flow rate. When the system pressure increases, the flow demand will decrease. At this time, the relief valve is opened, so that the excess flow flows back to the tank, to ensure that the relief valve inlet pressure, that is, the pump outlet pressure is constant (the valve port is often opened with pressure fluctuations).

Pressure stabilizing effect: The relief valve is connected in series on the return oil circuit, the relief valve produces back pressure, and the stability of the moving parts is increased.

System unloading function: the remote control port of the relief valve is connected to the solenoid valve with a small overflow flow. When the electromagnet is energized, the remote control port of the relief valve passes through the fuel tank, and the hydraulic pump is unloaded at this time. The relief valve is now used as a unloading valve.

How to adjust the pressure of hydraulic relief valve

Loosen all the screws of the relief valve, the equipment runs, slowly tighten the screws, look at the pressure gauge, and then stop after a few mpa of pressure, let the equipment run statically under this pressure for a few minutes, and then repeat the process of boosting and running until the set pressure is adjusted.

Each hydraulic station oil pump outlet will have an overflow valve, sometimes for some reason, the pump outlet pressure may be greater than the pressure required by the system, this time you need the overflow valve to remove the excess pressure, the oil back to the tank.