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Peek bearing with trapped PTFE bearing liner

  • US 5,568,983 A
  • Filed: 06/21/1994
  • Issued: 10/29/1996
  • Est. Priority Date: 06/21/1994
  • Status: Expired due to Term
First Claim
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1. A bearing for use on a fluid control valve having a rotary shaft subject to operating load pressures sufficient to overload and extrude PTFE, said bearing comprising:

  • a cylindrical PTFE liner adapted to surround the rotary shaft to enable the shaft to rotate with respect to the liner during use of the fluid control valve with the cylindrical PTFE liner bearing the operating load pressures which may be sufficient to extrude PTFE;

    a cylindrical non-metallic bearing jacket having an interior surface and including a cylindrical inner cavity defined between opposite annular cavity end lips for retaining said liner, said cavity end lips extending inwardly from the interior surface to an end lip surface wherein the diameter of said end lip surface is slightly larger than the diameter of said rotary shaft and wherein the clearance between said end lip surface and the rotary shaft is zero on the load side of the bearing; and

    said cylindrical PTFE liner having a thickness sufficient to nest said liner in said cavity between said cavity end lips and with the inner diameter of said liner conforming to the diameter of said end lips surface so that with said rotary control valve under substantial operating pressure sufficient to extrude PTFE, any overloaded PTFE is maintained within said cavity and between said cavity end lips of said bearing jacket.

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