What can cause the release of pressure in a pressure relief valve?

The release of pressure in a pressure relief valve is primarily caused by excessive pressure build-up within a system. Pressure relief valves are designed as a safety mechanism to protect equipment, piping, and both operatives and the environment from potential hazards associated with high pressure. When the pressure exceeds a preset limit, the valve opens to vent the excess pressure to a safe location, thereby preventing possible damage or failure of the system.

Normal operation does not cause the release of pressure; rather, these valves are intended to remain closed during normal conditions and only activate under excessive pressure scenarios. Scheduled maintenance and cooling procedures could temporarily alter the pressure but are not direct causes for the release of pressure from the valve itself. Maintenance, for example, involves inspecting and possibly testing the valve to ensure it functions properly without actually letting pressure escape during regular operation.