What occurs to excess pressure within a pneumatic system?

In a pneumatic system, excess pressure is managed to prevent potential damage or failure of the components. A relief valve plays a critical role in this process by venting excess pressure overboard when it exceeds a predetermined level. This ensures that the system operates within safe pressure limits, thereby protecting the integrity of the system and the connected components.

The relief valve is designed to open at a specific pressure threshold, allowing any additional pressure to escape, which helps maintain the operational efficiency of the system. This action not only prevents damage to components from overpressure but also allows for the proper functioning of pneumatic actuators and other devices that rely on consistent and safe pressure levels.

The other options do not accurately describe the function and purpose of pressure management within pneumatic systems, as sealing pressure can lead to dangerous build-up, accumulators serve to store energy rather than manage excess pressure, and pressure levels need to be regulated rather than remain constant in dynamic systems.