A new device for the measuring of radial load in the laboratory and quality control is described. Equations are derived for the evaluation of the radial load and the influence of materials and seal dimensions on the radial load are shown. Obtainable production tolerances for the radial load of a seal are discussed. Considerable changes of radial load due to working conditions can cause the failure of a seal. More attention should be paid to a thorough consideration of the working conditions before a seal is designed.

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