What is the purpose of pressure relief valves in SCBA systems?

The primary purpose of pressure relief valves in SCBA systems is to prevent over-pressurization of the cylinder. These valves are designed to automatically release air when the internal pressure of the cylinder exceeds a certain threshold. This is crucial for maintaining safety, as excessive pressure can lead to structural failure of the cylinder or other vital components of the SCBA. By releasing excess pressure, these valves help ensure that the equipment operates within safe limits, thereby protecting the user and ensuring the reliability of the SCBA in hazardous environments.

The other choices do not align with the function of pressure relief valves. For instance, increasing cylinder pressure or enhancing airflow during operation are not functions that pressure relief valves serve; they are primarily protective devices. Monitoring air quality is also a separate function, generally managed by different components of the SCBA system, highlighting the specific role of pressure relief valves in maintaining safety through pressure regulation.