Which statement best describes the pressure relief valve?

The pressure relief valve is designed to automatically regulate and relieve excess pressure in a system to maintain safe operating conditions. The correct answer highlights that it is pneumatically driven and provides pressure relief, emphasizing the role of pneumatic power in its operation. Pneumatic systems utilize compressed air or gas to facilitate various functions, including the operation of valves, and in this case, the pressure relief valve relies on pneumatic pressure to function effectively.

This choice accurately reflects the operational principles of pressure relief valves found in various aircraft systems, where they play a critical role in safeguarding the structural integrity of the systems they protect. By preventing pressure build-up that could potentially lead to catastrophic failures, the pneumatic-driven nature of this valve ensures that the aircraft maintains a safe environment for both equipment and passengers.