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A rubber ball provides an effective and efficient seal in check valve type applications. The ball's effectiveness in sealing, however, is dependent on its roundness. Circularity tolerances normally range from .006-.008 (0.15 - 0.20 mm) for molded-only parts.
Parts with diameters of .093 - 1.000 (2.36 - 25.40 mm) can be put through a centerless grinder to remove gates and parting lines, reducing the variation to .003-.004 (0.08 - 0.10 mm).
Designing Rubber Components
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