What is the main function of a pressure relief valve?

The main function of a pressure relief valve is to protect the hydraulic or pneumatic system by relieving excess pressure. When pressure in the system exceeds a preset limit, the relief valve opens, allowing excess fluid to escape or return to the reservoir. This prevents potential damage to system components, such as hoses, fittings, and actuators, which can occur when pressure levels are too high. By maintaining safe operating pressures, the relief valve helps ensure the longevity and reliability of the system.

Increasing system pressure or controlling actuator speed are not functions of the pressure relief valve; rather, these actions are typically managed by other components within the system. Preventing system leaks is also a separate issue that involves different mechanisms, such as seals and connectors, rather than the operation of a pressure relief valve.