What is the main function of a pressure relief valve in a hot water system?

The main function of a pressure relief valve in a hot water system is to release excess pressure. This is a critical safety feature designed to prevent damage to the system due to overpressure, which can occur under certain conditions, such as when water is heated and expands. If the pressure in the system exceeds a pre-set limit, the pressure relief valve automatically opens, allowing water to escape and thus reducing the pressure within the system.

This mechanism ensures that the system operates within safe limits, protecting components like pipes, tanks, and fittings from potential failure or rupture, which could lead to leaks or even catastrophic failures. The valve is essential for maintaining safety in hot water systems, particularly in environments where boilers or hot water heaters are used, as these systems can generate significant amounts of pressure during operation.