The main function of the excavator relief valve is to control the pressure of the hydraulic system, ensuring the normal operation of hydraulic components and stable system operation.

The excavator relief valve, also known as a safety valve, plays a crucial role in the hydraulic system. Its main functions include:

1.Pressure Control**: The relief valve can automatically adjust the opening and closing of the valve based on changes in system pressure, thereby controlling the pressure of the hydraulic system within an appropriate range. When the system pressure reaches the set value, the relief valve will automatically open, allowing excess hydraulic oil to flow back to the tank, maintaining stable system pressure. Conversely, when the system pressure is below the set value, the relief valve will close, increasing the flow of hydraulic oil to raise system pressure. This automatic adjustment mechanism ensures the normal operation of the hydraulic system.

2.Limiting the Maximum Pressure of the Hydraulic System**: The relief valve is located on the distributor valve body and serves to limit the maximum pressure of the entire hydraulic system to protect it from damage. If the spring in the relief valve breaks or the set pressure is too low, it can result in the system pressure being too low. In this case, the relief valve’s pressure relief will prevent the hydraulic system from establishing the necessary pressure for normal operation, causing a delay or lack of movement in the machine.

3.System Unloading and Safety Protection**: The relief valve also functions in system unloading and safety protection. When the system pressure exceeds the set pressure of the relief valve, hydraulic oil flows back to the tank through the relief valve, helping to protect the hydraulic system and components from damage due to excessive pressure.