Accession Number : ADD010929

Title :   Integral Elastomeric/Graphite Dynamic Face Seal.

Descriptive Note : Patent,


Personal Author(s) : Martini,L J

Report Date : 15 Nov 1983

Pagination or Media Count : 8

Abstract : A shaft seal is presented which combines the attributes of the low pressure sealing of an O-ring and the high pressure sealing of a carbon face seal. This invention provides a dynamic shaft seal with the advantage of a very reliable, positive elastomeric O-ring seal for low pressure sealing and the advantage of a reliable graphite face seal for high pressure sealing incorporated into an integral configuration. This integral configuration allows a smooth transition between the low pressure 0-ring seal and the high pressure carbon face seal without leakage. Springs are designed to provide the correct preload compression on the dynamic O-ring seal and the forces required such that the transition operation occurs at the proper differential pressure. Mechanically, a rotating shaft within an aperture in a pressure housing wall is fitted with a sleeve containing a carbon face seal that mates against the face of an elastomeric/graphite-interface seal. The carbon face seal components are keyed to rotate with the shaft while the elstomeric/graphite-interface seal is keyed to the aperture and remains fixed in place during the shaft's rotation. The elastomeric/graphite/interface seal also houses an O-ring which provides a dynamic seal for the shaft at low pressure. Actuation of either the high pressure face type seal or the low pressure O-ring seal is adjustable controlled by compression springs in the mechanism. (Author)

Descriptors :   *Patents, *Seals(Stoppers), *Shafts(Machine elements), Elastomers, Graphite, O rings, Low pressure, High pressure, Integrated systems, Configurations, Springs, Compression, Apertures, Housings, Walls, Sleeves, Carbon

Subject Categories : Adhesives, Seals and Binders
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE