Twin face seal

Details Twin face seal Twin face seal

1988-07-27

1990-02-13

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 28, 277 59, 277 65, 277 71, 277 72R, 277 81R, F16J 1534, F16J 1540

Patent

active

049000390

ABSTRACT:
A redundant seal arrangement employs first and second face-type seal assemblies for sealing between a housing and rotary member. A drain passage communicates with an intermediate area disposed between the first and second seal assemblies. During normal operation, minute amounts of fluid migrate past the first seal assembly and communicate with the passage to the drain. Alternatively, if the first seal assembly fails, a drain valve closes or a restriction orifice is used so that the intermediate area is raised to essentially the working pressure and the second seal assembly seals against further migration of the working fluid.

REFERENCES:
patent: 3127181 (1964-03-01), Crego et al.
patent: 3416808 (1968-12-01), Voitik
patent: 3539270 (1970-11-01), Derrickson
patent: 3591188 (1971-07-01), Eisner
patent: 4268232 (1981-05-01), Haupt
patent: 4299398 (1981-11-01), Wahl
patent: 4669735 (1987-06-01), Sundberg et al.
patent: 4759554 (1988-07-01), Kemp et al.

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