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Mechanic Method

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HM41- Rotary Type High Temperature Welded Metal Bellow Mechanical Seals


Design Features:

  • Conform to API 682 Standard;
  • Metal bellows, balanced, rotary structure;
  • Mainly used as the inner seal and outer seal of unpressurized or pressurized FB combination (commonly known as tandem arrangement);
  • Precision lapping of the sealing ring has a high degree of smoothness and excellent flatness;
  • Single seal and dual seal arrangement can be adopted, but dual seal arrangement is adopted for higher safety (recommended);
  • Three curvature and 45 ° angle of special designs, can make the stress of the bellows better, longer life;
  • Flexible graphite (or expanded graphite) is used as auxiliary sealing ring;
  • Simple and reliable structure, easy to install and disassemble.

Performance Capability:

  • Shaft diameter: 20-150mm;
  • Temperature: -75℃-425℃;
  • Pressure: vacuum ~ 2.0mpa (single layer), vacuum ~ 6.9mpa (double layer);
  • Speed: 0-25 m/s;
  • Media: high temperature oil, high temperature hydrocarbon, aqueous solution, corrosive chemical products and some acids, etc.


Chemical process, oil refining, petrochemical, paint and ink, pulp and paper industries.
HM12三维剖面图 HM12二维截面图


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