Mechanical seal

Details Mechanical seal Mechanical seal

1979-10-10

1981-10-27

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 27, 277 93SD, F16J 1534, F16J 1548

Patent

active

042969352

ABSTRACT:
In a mechanical seal for the rotary shaft of a rotary machine wherein the pressure difference between the internal and external liquids acting on the mechanical seal changes from positive to negative, and vice versa, a ring and a seat ring are formed with mating seal faces which coact to seal between the internal and exterior liquid present externally and internally, respectively, of the retainer; the seat ring is securely and liquid-tightly mounted on the rotary shaft for rotation therewith in a casing; the ring is fitted over a retainer axially movably, but nonrotationally and is normally pressed against the seat ring under the force of a bias spring which provides the sealing force for maintaining the seal between the seal faces when the external liquid pressure exceeds the internal liquid pressure, but the pressure difference is relatively small; the retainer in turn is mounted in the casing nonrotationally but axially movably due to the difference in pressure between the internal and external liquids, whereby regardless of the difference in pressure between the internal and external liquids, the seal may be maintained securely.

REFERENCES:
patent: 2984507 (1961-05-01), Welch
patent: 3184244 (1965-05-01), Van Vleet
patent: 3218110 (1965-11-01), Conner
patent: 3921986 (1975-11-01), Geary et al.
patent: 4007940 (1977-02-01), Chapa
patent: 4114900 (1978-09-01), Wiese

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