Junction X uses the Dimensional Check Valve Type Y which has a diameter of Z

A Caution message in AFT Impulse.

Full message is:

Junction X uses the Dimensional Check Valve Type of Y which has a diameter of Z. The downstream Pipe A has a diameter of B. A Dimensional Valve Type with a diameter of B or a Non-Dimensional Valve Type is recommended.

The Dimensional Check Valve options are based on actual valves for which empirical data is available. These dimensional options should only be used when they match the actual size of the valve in the real system. If the dimensional option does not match the actual valve size, the user should choose a more appropriate dimensional option or use the non-dimensional options.