Chesterton 891 Rotary Inside Single Mechanical Seal

1in to 8in / 18mm to 200mm shaft sizes, provides an upgrade to standard original equipment component seal installations.

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Chesterton 891 Rotary Inside Single Mechanical Seal Installation Manual - 1 to 2.625in/18 to 65mm Chesterton 891 Rotary Inside Single Mechanical Seal Installation Manual - 2.75 to 8in/68 to 200mm

Effective April 15th, 2025 Chesterton has added a 3% surcharge for all of their products. The surcharge will appear as a separate line item on the order.

Highlights...

Features

  • Shaft sizes:
    • 1in to 8in
    • 18mm to 200mm
  • -67 to 570˚F (-55 to 300˚C) operating temperature
  • Vacuum to 60psig (40barg) process pressure
  • Up to 5000 RPM operating speed
  • 316 Stainless Steel hardware
  • Alloy C-276 springs
  • Face materials:
    • Carbon Graphite, Resin Impregnated
    • Silicon Carbide, Reaction Bonded
    • Tungsten Carbide, Ni-Binder
  • Elastomer materials:
    • Fluorocarbon (FKM)
  • ISO-3069-S, ASME B73.1, ASME B73.2, NSF61

The Chesterton 891 Rotary Inside Single Mechanical Seal is designed for the replacement of low technology component seals and provide an upgrade to standard original equipment component seal installations. The 891 is designed not to damage or fret the equipment shaft/sleeve because the dynamic O-Ring is positioned on a replaceable component surface. The balanced, high-pressure monolithic seal design will provide a reliable upgrade to standard, unbalanced designs. The seal can be easily rebuilt in the field using low-cost rebuild kits.