What is 'stall pressure' in the context of pneumatic systems?

In pneumatic systems, 'stall pressure' refers to the pressure limit when the system is not actively delivering air. It represents the maximum pressure that can be achieved in the system when the air supply is not flowing through, often occurring when the compressor is at rest or when a valve is closed. At this point, the pressure is built up in the lines or tank, but there is no output. Understanding this concept is crucial, as it helps in the design and troubleshooting of systems, ensuring they can handle the expected pressures without failure during operation.

While the other options touch on related pressure concepts in pneumatic systems, they do not accurately define 'stall pressure.' For example, the minimum pressure required for operation would refer to a different threshold necessary to begin functioning, while working pressure during normal operation involves the conditions when the system is actively moving air. Residual pressure, on the other hand, indicates leftover air pressure after the system has been discharged, which is distinct from the static pressure reached when the system is stalled.