Differential pumping seal apparatus

Details Differential pumping seal apparatus Differential pumping seal apparatus

2006-11-14

2006-11-14

Pickard, Alison K. (Department: 3673)

Seal for a joint or juncture

Seal between relatively movable parts

Close proximity seal

C277S914000, C384S015000, C384S132000

Reexamination Certificate

active

07134668

ABSTRACT:
A differential pumping seal apparatus includes a differential pumping seal for sealing a first space and a second space from each other in a non-contact manner, and a back up seal mechanism for sealing the first space and the second space from each other in a contact manner. The back up seal mechanism is operated to seal the first space and the second space from each other only when the differential pumping seal is stopped or while operation of said differential pumping seal is stopped.

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