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AST 7023

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Metal components: 316 Stainless Steel
Rotating seal ring: Carbon-Graphite or Graphite-Loaded Sintered Silicon Carbide
Stationary seal ring: Sintered Silicon Carbide or Tungsten Carbide
Springs: Hastelloy C-2761
O-rings: Fluoroelastomer, EPDM, Aflas2, or Isolast3 perfluoroelastomer


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

Liquids pumped near their vapor pressure must be cooled for successful sealing.  Hot water, for example, has low lubricity and causes high seal face wear.  Flashing can open the seal faces, causing leakage and seal face damage.

API Plan 23 (ANSI Plan 7323) is the most reliable and economical way to cool a seal.  The sealed liquid is circulated from the seal chamber (not the pump discharge) through a cooler and back to the seal. Since only the liquid around the seal is cooled, the heat load on the cooler is minimized and process energy is conserved.  Cooler fouling is reduced, extending cooler life.

The AST 7023 seal is the off-the-shelf solution for hot liquid sealing.  Its built-in pumping ring fits in enlarged bore seal chambers on popular ANSI pumps.

No orifice to clog

The low pressure differential (compared to Plan 21) means that no orifice is required to regulate cooling flow.

High temperature sealing with standard materials

The AST 7023 seal is cooled and isolated from the hot process.  Corrosion rates and elastomer compression set are reduced, and precipitation from dissolved solids is minimized.

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 7023 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 Impeller Adjustment

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