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Bellows tandem seals



Applied in pump units and equipment where sealed fluids are oil products, liquids with harmful chemical agents, including dissolving rubber, at process operating temperatures up to 400°C.
Are used in case of hindered clean cooling liquid supply.


  • Penetration of barrier fluid into sealed fluid is eliminated.
  • First (circuit) friction pair operates at barrier fluid and sealed fluid pressure drop. Second, atmospheric one, - at barrier fluid and air pressure difference.
  • Barrier fluid is a chemically unaggressive, non-toxic liquid, compatible with sealed fluid.
  • No elastomer.
  • Rotating bellows blocks provide for corrugations self-cleaning.
  • Piping is performed according to API 682: Plan 52.


Shaft diameter, mm
30 … 100
Shaft speed, Rpm max 5000
Temperature of sealed medium, °С  -70 … 400
Pressure of medium, MPa Up to 20 
Max. leakage, l/h  0,002
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