How a pressure relief valve works

The core operating principle of a pressure relief valve lies in its excellent pressure control function. When the system pressure exceeds the preset safety range, the device can be activated automatically to quickly release the excess pressure, thus maintaining the overall safety of the system. Specifically, when the system pressure falls below the set value, the pressure relief valve remains closed; Once the pressure exceeds a predetermined threshold, the valve automatically opens, allowing the fluid to escape briefly until the pressure drops to an acceptable level, after which the valve reseals to stop the flow of fluid. This sophisticated pressure control mechanism ensures that the hydraulic system or other type of system is always in a safe and controllable state, effectively preventing damage that can result from excessive pressure.
In practice, the set pressure of the pressure relief valve can be flexibly changed by adjusting the spring tightness, and some advanced models of pressure relief valves are even equipped with an electronic control system to make pressure adjustment more convenient and efficient. This flexibility allows the pressure relief valve to be adapted to a wide range of applications.