Back-up mechanical seal

Details Back-up mechanical seal Back-up mechanical seal

1981-09-08

1983-03-01

Levy, Stuart S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 3, 277 58, 277237R, 277DIG10, 415174, F16J 1546, B65D 5306, F04D 2908

Patent

active

043752918

ABSTRACT:
A pump assembly having an impeller for pumping a fluid from an intake to an outlet, a prime mover for driving the impeller, and a primary mechanical seal assembly between the prime mover and the impeller which is located in a housing. The mechanical seal assembly substantially prevents leakage of the fluid being pumped along a shaft connecting the impeller and the prime mover. A secondary mechanical seal means is located in the housing between the prime mover and the mechanical seal assembly. The secondary seal means is constructed of a material, such as carbon, which will collapse under pressure of the fluid being pumped upon failure of the primary mechanical seal assembly, to substantially prevent the leakage of fluid along the shaft and to the exterior of the housing.

REFERENCES:
patent: 1331360 (1920-02-01), Parsons et al.
patent: 3096985 (1963-07-01), Biheller
patent: 3510230 (1970-05-01), Raub
patent: 3947044 (1976-03-01), Friedrich

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