Stoppers for testing valvesStoppers for testing valves

Pneumatic stopper for testing - VELAN RATEAU

Pronal has developed a range of “tailor-made” pneumatic stoppers for testing the tightness of Velan Rateau valves on the primary circuits of nuclear power plants. This range of stoppers has been designed to test the tightness of the swing mechanism on the sealing surfaces.

Unlike inflatable stoppers for testing Bouvier Darling valves, these pneumatic stoppers for testing “Velan Rateau” valves are not inflatable. They are equipped with a system of plates covered with PMUC rubber and an inter-seal for checking the tightness of the stopper. This system is mounted on a mechanical fork which is itself equipped with a stop to facilitate installation and removal.

It is these stoppers which equip the METEOR® test bench. This test bench is used to measure the tightness of valves at a constant pressure. It can provide both instantaneous and averaged measurements of any leakage flow. Hydraulic testing is performed at a pressure of 10 Bar.



  • Completely air/watertight
  • Customised valves


  • Stopper operation can be verified by making inter-seal measurements
  • PMUC-certified materials


  • Rapid, easy installation
  • Reusable
  • Delivered in an aluminium case with foam padding

Detailed information

  • Material: NBR PMUC
  • Technique: hot vulcanisation in a vacuum autoclave
  • Dimensions: DN80/DN100/DN150/DN200/DN250/DN300
  • Form: Conical
  • Mechanic
  • Temperature resistance: -25/+85 C°
  • Test pressure: 10 Bar

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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.

Standards / regulations

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


Fact Sheets / Business Guides
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