The AST 80M Seal is a rugged dual seal built for use in mixers, agitators, double- ended pumps, and other rotating equipment in demanding service. With its large internal clearances, the AST 80M tolerates shaft runout and end play that would make another seal fail.
The hydraulic double balance of the AST 80M means it can be used in three ways:

Double Seal: With barrier fluid pressure higher than product pressure, the AST 80M prevents leakage of hazardous fluids into the environment. The barrier fluid provides lubrication for the seal in top-entry mixers.

Tandem Seal: By using a buffer fluid with pressure lower than process, the AST 80M can reduce the pressure differential across each set of seal faces.

Spare Seal: With unpressurized buffer fluid, the outboard seal runs “at idle” as a standby seal. If the inboard seal fails, the outboard seal provides primary protection, eliminating unscheduled shutdown of batch processes.


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