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The AST80M Seal is a rugged dual cartridge mechanical seal built for use in mixers, agitators, double-ended pumps, and other rotating equipment in demanding service. With its large internal clearances, the AST80M tolerates shaft runout and end-play that would make another seal fail.

The hydraulic double balance of the AST80M means it can be used in 3 ways:

Double Seal

With barrier fluid pressure higher than product pressure, the AST80M 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 AST80M 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.