The sealing of the surface is an important factor for the quality assurance of the valve seats. The parameters, with tolerances specified in a separate technical drawing, are to be measured to assess if they conform to the defined tolerances. One of these parameters was defined in terms of concavity of the sealing area, and measured as the largest deviation between a fitted line and the cross-section of the measured surface.
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These measurements were made with the InfiniteFocusG4, this is the previous version to the G5 shown in the illustration. Using this instrument it is possible to easily measure parameters quickly, easily and repeatably on the whole valve surface and not only on a small area.