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API Seal 9400 Dual Series


Edge welded metal bellows API Seals are best suited to higher temperature applications in the oil and gas industry, available in either a Type B or Type C configuration. The bellows seals allow for graphoil based, non-elastomeric secondary sealing to be used (Type C) In high temperatures or very aggressive chemical environments which is a significant advantage the bellows seals allow for graphoil based, non-elastomeric secondary sealing to be used.

In high temperatures of very aggressive chemical environments, this is a significant advantage. Dual bellows seals with graphoil based secondary sealing are able to operate at the upper-temperature limit of an application. The use of nickel-based alloys in the construction of the bellows stack gives the 9400 series bellows the required material performance at significantly elevated operating temperatures. As with other dual seals in the A.R. Thomson range, the 9400 can be specified with either a contacting or non-contacting secondary containment seal instead of the traditional wet dual seal design.

Though the standard 9400 series seal is a flexible rotor design, it can be offered in flexible stator configuration if required.


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Application Form


  • High temperature & high pressure capability.
  • Designed according to API type C, Category 2 or 3, arrangement 2 or 3, configuration 2CW-CW or 3CW-FB.
  • Cartridge Design for quick and easy installation.


  • Hot Hydrocarbons.
  • Oil Refining
  • Petrochemical
  • Operates with API Flush plan 52, 53 or 54.

Operating Range

  • Pressure Max: 290psi (20 Bar)
  • Temperature Max: 750F (400C)
  • Speed Max: 5000 fpm (25 m/s)

Standard Materials

  • Metal Parts: 316SS or Hastelloy C
  • Seal Faces: Antimony Impregnated Carbon Graphite, Silicon Carbide, Resin
  • Impregnated Carbon graphite.
  • Secondary Seals: Flexible Graphite
  • Springs: Hastelloy C