Backup seal with bush in form of radially floating washer

Details Backup seal with bush in form of radially floating washer Backup seal with bush in form of radially floating washer

1984-11-30

1985-11-12

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 28, 277 65, 277 83, 277 85, 277174, F16J 1538

Patent

active

045523681

ABSTRACT:
A backup seal for a main seal (not shown) sealing a rotary shaft (10) to a housing (12) comprises a rotary seal element (20) sealed (22) to the shaft (10) and a stationary seal element (16) sealed (18) to the housing (12). The seal elements (16,20) have opposing annular seal surfaces (41,42) surrounding the shaft (10) and these are adapted to be urged together to form a running seal therebetween substantially only by the pressure of fluid product leaking through the main seal should that fail. A second aspect of the invention provides a close fit bush (50) which helps to close the seal faces (41,42) together when the main seal fails and before any leak occurs between them.

REFERENCES:
patent: 3090627 (1963-05-01), Tankus
patent: 3144253 (1964-08-01), Schirmer
patent: 3291491 (1966-12-01), Smith
patent: 3811687 (1974-05-01), Honold et al.
patent: 4204689 (1980-05-01), Johansson

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