Segmented Seals​

In certain extreme applications, a Qualiseal part made of individual segments may meet your critical performance requirements better than a single-piece unit. Just tell us what you’re trying to accomplish and we’ll find the ideal solution.

Segmented seals ride directly along the shaft and are primarily used in low-pressure applications.

These seals contain a series of segmented carbon rings which contact the shaft or rotor. Segments inside the seal housing are kept in the proper location by anti-rotation keys or pins. A secondary seal is formed by the axial spring loading of the seal rings against the internal surface of the housing face. During movement, a continuous seal is always in contact with either the primary or secondary sealing surfaces.

Ideal For:

  • Gas seals and for sealing low pressure liquids


  • Tolerance to unlimited shaft axial movement
  • Prevents oil and contaminant migration into the process gas side
  • Leakage rates remain constant over the life of the seal


  • Rides directly along the shaft
  • Special gap segments permit the seal to adjust dimensionally for minimal leakage
  • Compression and garter springs ensure that segments remain in contact with mating surfaces during low delta pressure and shutdown conditions

Operating Conditions:

  • Pressures up to 100 PSIA (689.5 kPa)
  • Temperatures: -100° F (-73°C) to over 2,000°F (1,093°C)
  • Shaft rotation speeds up to 40,000 FPM (203 m/s)

Design Configurations:

  • Various seal ring segment configurations
  • Pressure-balanced segments
  • Fractured rings
  • Multiple seal labyrinth
  • Internally pressurized seal
  • Internally vented seal

Primary Seal Materials:

  • Carbon
  • Silicon carbide
  • Bronze
  • Alloy and stainless steel

Mating Surfaces:

  • Hardened alloy and stainless steel
  • Hard chrome plate
  • Chrome oxide
  • Tungsten carbide
  • Silicon carbide


  • Aircraft engine main shafts
  • Accessory gearboxes
  • Compressors
  • Transmissions
  • Rotating and/or reciprocating machinery

Industries Served:

  • Aerospace
  • High-speed compressors
  • Nuclear marine
  • Military

Contact us to learn more about our Segmented Seals.