Flowserve® N-Seal Nuclear Primary Pump Seal

The result of years of research, thousands of hours of rigorous testing and decades of primary pump application experience, the Flowserve N-Seal primary pump seal represents the nuclear industry’s most advanced mechanical seal technology. With each of three stages capable of sustaining 100% system pressure, the N-Seal has successfully provided proven service life and fail-safe redundancy in Flowserve Byron Jackson® primary coolant pumps for years.

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  • Cartridge construction simplifies installation, improves seal setting accuracy and helps reduce associated costs
  • Triple-redundant design mirrors existing seal system parameters, with each stage capable of handling 100% system pressure
  • Hydrodynamic seal face technology delivers greater reliability and longer operating periods than hydrostatic designs
  • Multiple seal face lift designs support non-contacting faces across a broad operating range
  • Automatic pressure redistribution after a stage failure supports fuel-cycle completion, while interchangeable stage components help reduce spare parts inventory costs

ASME Section III, Class I

  • Discharge pressures to 170 bar (2500 psi)
  • Temperatures to 300°C (580°F)
  • Speeds to 1800 rpm

Size Range: 6" to 9.62" shaft size

Nuclear Seal

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