THPGV inflatable stoppersTHPGV inflatable stoppers


THPGV inflatable pipe stoppers are used within the primary zone of nuclear facilities. These systems are designed to plug steam generator man-holes during maintenance operations or if leaks are present in the steam generator’s water boxes.

It becomes essential to rapidly plug the man-holes. Indeed, they have remained open in the event that leaks are identified on the stopper or if the primary pipeline’s drains have ruptured.

Moreover, Our THPGV inflatable pipe stoppers have been studied and developed in close collaboration with EDF. They are the perfect solution to these problem scenarios.

Finally, several diameters of stopper are available based on the diameter of the manhole: 900mW, 1300 mW and EPR.



  • Autonomous inflation system
  • PMUC-certified equipment
  • Equipped with a hand-wheel for easier operator handling and installation


  • The stopper’s inflation valve complies with the DESP directive and is certified by an independent body.
  • A bottle of compressed air is located inside the stopper which can be inflated when an intervention is required


  • Operational monitoring in accordance with the constructor’s manual
  • An inflation system which complies with the DESP directive (Directive for Pressurised Elements)
  • The stopper’s weight has been optimized for operator handling
  • Supplied in an aluminum case with foam padding

Detailed information

  • Matériel: NBR (Nitrile Butadiene Rubber) PMUC
  • Manufacturing process: hot vulcanisation in a vacuum autoclave
  • Stopper diameters: 406 / 450 / 500 mm
  • Inflation: by nitrogen
  • Temperature resistance: -25°C / +85°C
  • Service pressure: 3.5 bar

You can not find your dimensions

Our design department employs the best project leaders and designers and will be pleased to develop and create a tailor-made product specially for your unique project.


Composition / Advice

Storage advice
Store in its original aluminium case away from light, damp, and temperature variations.
Maintenance tips
Carefully check all the external surfaces to ensure that there are no obvious deformations (folds, bulges, or cuts).

Standards / regulations

In accordance with the conditions of the Pronal guarantee
Please contact us


Fact Sheets / Business Guides
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