Reverse pressure activated rotary drill head seal

Details Reverse pressure activated rotary drill head seal Reverse pressure activated rotary drill head seal

1978-03-23

1979-03-13

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 28, 277 59, 277 3, 166 82, F16J 1556, F16J 1532

Patent

active

041438809

ABSTRACT:
An improved rotary drill head is provided having two lip seals installed in a seal cavity to provide a long lasting dynamic seal. The first lip seal is installed with the heel first and the second lip seal is installed with the lip first. Lubricant is maintained between the two seals at a pressure greater than the operating pressure of the rotary drill head. The lubricant pressure energizes the two lip seals. The abrasive fluid from the borehole is prevented from leaking past the seals because of the pressure differential. An infinitesimal amount of lubricant will leak past the lips of the seals thereby lubricating the seal.

REFERENCES:
patent: 2649318 (1953-08-01), Skillman
patent: 2808229 (1957-10-01), Bauer et al.
patent: 3176996 (1965-04-01), Barnett
patent: 3295389 (1967-01-01), Walischmiller
patent: 3529835 (1970-09-01), Lewis
patent: 3631834 (1972-01-01), Gardner et al.
patent: 3653350 (1972-04-01), Koons et al.
patent: 3827700 (1974-08-01), Kaller
patent: 3834715 (1974-09-01), Butler
patent: 3868832 (1975-03-01), Biffle
patent: 3999766 (1976-12-01), Barton

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