Inflatable stoppers for testing Bouvier Darling valvesInflatable stoppers for testing Bouvier Darling valves

Inflatable stoppers for testing Bouvier Darling valves

The primary circuits in nuclear power plants are equipped with swing type check valves. The ASN has determined the frequency that the tightness of these swing valves must be tested.

This is why Pronal has developed a range of “tailor-made” inflatable stoppers for testing Bouvier Darling valves on the primary circuits

As a result, this range of stoppers is used to test the tightness of the swing mechanism on the sealing surfaces. As an example, the inflatable stoppers for testing Bouvier Darling valves are installed on the RIS / RCP circuit.

In contrast to the pneumatic stopper for testing – VELAN RATEAU, the stoppers for testing “Bouvier Darling” valves are inflatable. They are equipped with a system of inflatable seals composed of layers of PMUC rubber and an inter-seal for verifying the tightness of the stopper. This system is equipped with a mechanical stop which ensures that the stopper is held in place in the main body of the valve.

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
  • System for measuring and detecting leaks
  • Can be customized to implement your valves


  • Inter-seal measurements can be taken to verify the stopper operation
  • PMUC-certified materials


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

Detailed information

  • Materiel: NBR (Nitrile Butadiene Rubber) PMUC
  • Technique: hot vulcanisation in a vacuum autoclave
  • Dimensions: DN80 / DN150 / DN250 / DN300
  • Form: cylindrical
  • Inflation: by water
  • Temperature resistance: -25/+85°C
  • Max. inflation pressure: 17 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.

Standards / regulations

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


Fact Sheets / Business Guides
  • This field is for validation purposes and should be left unchanged.
We use cookies to allow you to visit and use our site. Certain cookies are necessary for its functioning and cannot be deactivated. Other data collection cookies help us to improve the relevance of our content. These cookies are only activated if you consent to their use by clicking below.
Ces cookies permettent de suivre le parcours utilisateur, le passage sur un site pour une évaluation et une stratégie marketing.
Ces cookies permettent d'obtenir des statistiques de fréquentation anonymes du site afin d'optimiser son ergonomie, sa navigation et ses contenus.
Refuse all