What is a common use for a pressure relief valve in plumbing systems?

A pressure relief valve plays a crucial role in plumbing systems by preventing the build-up of excess pressure. When pressure within a plumbing system exceeds a predetermined level, the valve acts as a safety mechanism by releasing some of the pressurized fluid, typically water or steam, to relieve the pressure. This action helps prevent potential damage to pipes, fittings, and appliances, as well as reducing the risk of leaks or catastrophic failures.

By maintaining a safe pressure level, the pressure relief valve ensures that the system operates effectively within its designed parameters, thus protecting the integrity of the plumbing system. In high-pressure scenarios, without such a valve, components could fail leading to dangerous situations or extensive repairs.

While the other options—such as increasing water temperature, filtering impurities, or assisting with drainage—are important functions within plumbing systems, they do not align with the primary function of a pressure relief valve, which is specifically focused on controlling pressure to ensure safety and system longevity.