Chesterton 250 Double Cartridge Mechanical Seal

1in to 4.75in / 25mm to 120mm shaft sizes, compact cartridge profile designed to fit standard ANSI/ISO process pumps.

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Chesterton 250 Double Cartridge Mechanical Seal Installation Manual (English) Chesterton 250 Double Cartridge Mechanical Seal Installation Manual (Other Languages)

Effective April 15th, 2025 Chesterton has added a 7.5% surcharge for all of their products. The surcharge will appear as a separate line item on the order.

Highlights...

Features

  • Shaft sizes:
    • 1in to 4.75in
    • 25mm to 120mm
  • 20˚F to 400˚F (-30˚C to 200˚C) operating temperature
  • Pressure ratings:
    • Vacuum to 300psig (20barg) process pressure
    • 150psig (10barg) maximum barrier pressure
  • Up to 3600 RPM operating speed
  • 316 Stainless Steel hardware
  • Alloy C-276 springs
  • Face materials:
    • Carbon Graphite, Resin Impregnated
    • Silicon Carbide, Sintered Pressureless
  • Elastomer materials:
    • Ethylene Propylene (EP)
    • Tetrafluoroethylene-Propylene (FEPM)
    • Fluorocarbon (FKM)
  • Fits popular ANSI/ISO and vertical pumps
  • Field and factory repairability
  • ISO-3069C, ASME B73.1, ASME B73.2
The Chesterton 250 Double Cartridge Mechanical Seal features a compact cartridge profile designed to fit standard ANSI/ISO process pumps. The gland design produces increased barrier fluid flow, providing better cooling capability. The multi-coiled springs provide even, consistent face load, and are placed out of the sealing fluid to avoid clogging. The composite seal face design is optimized to improve lubrication and extend overall seal life.