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HM73- Carbon Floating Ring Seals with Split Housing and Segmented Seal Rings


Design Features:

  • Chamber seal (modular design), optional with housing and lid;
  • Segmented seal rings, radially cut, for easy replacement;
  • Split housing design, for easy replacement;
  • Very small operation gap - low leakage;
  • Dry running, no need liquid lubricated and cooling;
  • Self-adjusting seal rings;
  • Compensation of radial and axial shaft deflections;
  • No sealing components mounted on the shaft and hence no additional shaft vibrations;
  • Seal rings running contact-free - sliding faces and machine consume no additional power;
  • Balanced seal ring inside chamber;
  • According to the characteristics of the medium, the connecting ports of sealing gas, separation gas and vent gas can be collocated;
  • High reliability, maintenance-free operation.

Performance Capability:

  • Shaft diameter: 40 to 350 mm;
  • Operating pressure: vacuum to 2.0 MPa;
  • Operating temperature: -120°C to 400°C for carbon, max.225°C for PTFE compound;
  • Sliding velocity: max. 150 m/s for carbon, max. 40 m/s for PTFE compound;
  • Radial play: ± 1.0 to 5.0 mm;
  • Axial movement: theoretically unlimited;
  • Recommended wear guard: > 58 HRC.


  • Chemical industry; power plant technology; petrochemical industry; food processing industry; metal production and processing;
  • Medium-sized and large fans / blowers; bearing seals (gear box, motors); steam turbines; mixers, agitators, mills, dryer;
  • Gases; fumes and exhaust, solids containing, flammable, acid containing and toxic gases; (solids containing) steams / liquid mist; oil mist / penetrating oil.
3-D profile of HM73 2-D sectional view of HM73


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