About



AST manufactures a complete line of cartridge and component mechanical seals for process pumps. All AST seals are field-rebuildable, giving pump users control over their schedule and budget.

Single Cartridge Seals
The AST 70 is a simple-to-install, unitized cartridge mounted, balanced, multiple spring seal which requires no measuring for installation. It is the basic mechanical seal of choice for ANSI pumps (including enlarged bore seal chambers), vertical pumps, split case pumps, and many more. The AST 7023 seal is the off-the-shelf solution for hot liquid sealing with ANSI Plan 7323 (API Plan 23). Its built-in pumping ring fits in enlarged bore seal chambers on popular ANSI pumps.

Dual Cartridge Seals
The AST 80 dual mechanical seal incorporates liquid shear pumping to remove heat from the seal faces, and can be operated with a pressurized barrier or non-pressurized buffer fluid system. The AST 80M Seal is a rugged dual mechanical 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.

Component Seals
For extremely corrosive environments, the AST 50 single outside seal has no metal parts in contact with the sealed liquid. It's the ideal seal for nonmetallic pumps. The AST 60 is a simple upgrade for existing component seal applications. It is hydraulically balanced, and can't fret the pump shaft.

Seal Accessories
Reservoirs (seal pots) are available for Plan 52 and Plan 53 arrangements with dual seals. Reservoir materials are carbon steel or 304 ss, with optional 316 ss cooling coils. Tubular sight gauges are standard. Heat exchangers (seal coolers) for Plan 21 and Plan 23 are available in a variety of sizes with removable or welded heads. Shell is carbon steel; coil is 316 ss.




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