Which method is used to visually determine whether the seat and the disk of a valve make good contact with each other?

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Spotting in is the method used to visually check that the valve seat and the disk actually meet evenly. In this approach, you bring the disk onto the seat just enough to form light, initial contact and then inspect the interface. The goal is to see whether contact appears all around the circumference or only at isolated spots. Uniform contact around the entire seating surface indicates a proper seal and good mating of the seat and disk. If inspection shows gaps or uneven contact, it signals that the surfaces aren’t seating correctly and further finishing may be needed.

The other processes—lapping, grinding, and polishing—are material-removal or surface-finish steps used to shape and smooth the mating surfaces after contact issues are identified. They refine the surfaces to improve seal quality, but they don’t provide the visual check itself. Spotting in gives the quick, direct visual assessment of whether the seating surfaces are making good contact.