Circumferential Seal Application: Military Aircraft

The control valve in a military aircraft had a controlled gap circumferential seal with a carbon steel composite ring assembly.  High wear and carbon ring deterioration resulted in shortened seal life.

Operating Conditions

  • High temperature (1,125°F)
  • Pressure (660 psid)

Determining Cause and Failure Modes

  • High-temperature carbon grade oxidizing due to high temperature

Technetics Qualiseal Technologies Solution

  • Designed a controlled gap circumferential seal utilizing a solid silicon carbide ring, improving temperature rating up to 2,500°F
  • Silicon carbide ring increased seal pressure rating based on FEA generated stress distribution

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