Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
277212C, 277233, 277235R, F16J 1512
An annular seal primarily for use in preventing leakage of liquids and gases along rotating and/or reciprocating shafts where the latter pass through support structures such as plates and casings. The annular seal (3) is characterized in that it has the shape of a hat with an axially apertured crown (3a) and an adjoining brim (3b) each comprised of a plurality of alternately interleaved layers of sheet metal (M) and of a non-metallic material (G) selected from expanded graphite, carbon, natural or synthetic rubber or bonded fibrous material. Such a seal can also be used in the sealing of a butterfly valve when in its closed position.
patent: 723096 (1903-03-01), Wert
patent: 1466087 (1923-08-01), Christenson
patent: 1520704 (1924-12-01), Farmer
patent: 2004652 (1935-06-01), Dempsey
patent: 3372941 (1968-03-01), Liebig
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