What is the purpose of a pressure relief valve in a boiler system?

A pressure relief valve in a boiler system is designed primarily to relieve excessive pressure that may build up within the system. This function is crucial in preventing potential hazards, such as boiler explosions or damage to the system. If the pressure exceeds a predetermined safe limit, the valve opens automatically to allow steam or water to escape, thus reducing the pressure back to acceptable levels. This safety mechanism ensures the overall integrity and safe operation of the boiler system.

While other options might mention related concepts, they do not accurately describe the specific role of a pressure relief valve. For example, increasing pressure or maintaining constant pressure are functions associated with pressure regulators or pumps, and measuring pressure pertains to pressure gauges. These devices serve different purposes and do not fulfill the critical safety role that a pressure relief valve does in managing excess pressure in the system.