Triple cartridge seal having one inboard and two concentric seal

Details Triple cartridge seal having one inboard and two concentric seal Triple cartridge seal having one inboard and two concentric seal

1996-04-18

1998-03-17

Cummings, Scott

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 15, 277 18, 277 65, 277 81R, 415175, 415180, F16J 1534

Patent

active

057277923

ABSTRACT:
A chemical processing centrifugal pump is provided with a triple cartridge seal arrangement including a first seal axially spaced from a pair of concentric seals. The passageway along the pump shaft between the single seal and the radially inwardmost concentric seal is filled with a pressurized barrier inert gas so as to create a gas seal while a barrier chamber defined between the concentric seals is filled with a pressurized barrier liquid. Accordingly, the concentric seals are lubricated by the barrier liquid disposed in the barrier chamber while the inboard seal is lubricated by the fluid being pumped. Optionally, the single seal may be lubricated by barrier liquid if such a pressurized liquid is used instead of the inert gas to fill the passageway.

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