For safe excretion.
When the pressure in the pipeline reaches the set pressure of the relief valve, the relief valve will automatically open and drain. When the pressure in the pipeline is reduced, the relief valve will automatically close to stop the pressure relief, which plays a role in the safety protection of the pipeline.
Relief valve is a hydraulic pressure control valve, mainly plays the role of constant pressure relief, pressure regulation, system unloading and safety protection in hydraulic equipment. In the assembly or use of the relief valve, due to the damage of the O-ring sealing ring, combination sealing ring, or the loosening of the installation screw and pipe joint, it may cause undue external leakage.
Note: If the poppet valve or main spool wear is too large, or the sealing surface contact is not good, it will also cause the internal leakage is too large, and even affect the normal work
