What happens when the pressure in a line exceeds the relief valve setting?

When the pressure in a line exceeds the relief valve setting, the valve opens to allow excess fluid to escape. This process is essential for maintaining safety and preventing system overloads. Relief valves are designed to protect piping systems from excessive pressure that can lead to equipment failure, leaks, or even catastrophic failures. By opening, the valve allows fluid to flow out of the system, thereby reducing pressure to a safe level.

This mechanism ensures that the operational integrity of the hydraulic or pneumatic system is preserved. It is critical for ensuring safe operations, particularly in applications where fluctuations in pressure can occur. The opening of the valve is a protective response, designed to keep the system within its operational pressures.