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AST 70
SINGLE CARTRIDGE SEAL

Brochure
Dimensional Data
Instructions

Product View

AST 70 views

Cutaway

AST 70 cutaway

Specifications

MATERIALS OF CONSTRUCTION

Metal components: 316 Stainless Steel standard; Alloy 20, Titanium, and Hastelloy C-2761 available
Rotating seal ring: Carbon-Graphite or Graphite-Loaded Sintered Silicon Carbide
Stationary seal ring: Sintered Silicon Carbide or Tungsten Carbide
Springs: Hastelloy C-276
O-rings: Fluoroelastomer, EPDM, Aflas2, or Isolast3 perfluoroelastomer

OPERATING LIMITS

Pressure: 400 PSIG (28 bar) maximum to 28 in (710 mm) Hg vacuum,
depending on shaft size and speed.
Temperature: To 500°F (260°C), depending on O-ring elastomer limits in fluid sealed

Notes: 1Trademark of Haynes International Inc., 2Trademark of Asahi Glass Co. Ltd., 3Trademark of Trelleborg Sealing Solutions

The AST 70 is a simple-to-install, unitized cartridge mounted, balanced, multiple spring mechanical seal which requires no measuring for installation. The seal faces are protected from damage and contamination from dirt and foreign particles.

Field Rebuildable

No more waiting for seal repairs, and no more worries about installing exchange seals that might have previously held hazardous materials, because the AST 70 is easy to rebuild on site using standard tools.

No measurement required

Simply slide the seal onto the shaft, bolt down the gland, tighten the set screws, and remove the centering blocks.

Easy replacement on split case and vertical pumps

No pump teardown required. Just slide the seal over the end of the shaft.

Easy Impeller Adjustment

Adjust impeller clearance without removing the seal or dismantling the pump.
 

OFF THE SHELF...
AST 70 seals are available off-the-shelf to fit most ANSI pumps, including enlarged bore pumps, without modification. Seals are in stock to fit many split case, positive displacement, and vertical turbine pumps.

...or ENGINEERED
We design and build special AST 70 seals for vertical turbine pumps, large split case pumps, and other systems that require more than a standard seal. Rebuild parts are still off-the-shelf.