Fail safe high pressure shaft seal

Details Fail safe high pressure shaft seal Fail safe high pressure shaft seal

1985-10-01

1987-06-02

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 2, 277 27, 277 38, 277 40, 277 70, 277 85, F16J 1534, F16J 1540, F16J 1554

Patent

active

046697357

ABSTRACT:
A shaft seal assembly 10 for a high speed centrifugal pump has a primary seal (30) and a secondary seal (32). During normal operation the primary seal has its nose (38) in firm engagement with a seal face (28) and the secondary seal has its nose (42) in light engagement with the seal face. Upon failure of the primary seal, the nose of the secondary seal is urged into firm engagement with the seal face. An orifice (58) in the nose of the secondary seal allows for controlled leakage which indicates primary seal failure.

REFERENCES:
patent: 2668068 (1954-02-01), Bredemeier
patent: 3165323 (1965-01-01), Hamano
patent: 3214182 (1965-10-01), Herbruggen
patent: 3239232 (1966-03-01), Andresen
patent: 3718336 (1973-02-01), Jackson et al.
patent: 3926442 (1975-12-01), Muller
patent: 4304408 (1981-12-01), Greenawalt

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