{"id":45772,"date":"2022-05-20T08:52:07","date_gmt":"2022-05-20T08:52:07","guid":{"rendered":"https:\/\/www.fhtvalves.com\/vannes-a-boule-flottantes-a-siege-souple\/"},"modified":"2026-04-23T08:00:05","modified_gmt":"2026-04-23T08:00:05","slug":"vannes-a-boule-flottantes-a-siege-souple","status":"publish","type":"page","link":"https:\/\/www.fhtvalves.com\/fr\/vannes-a-boule-flottantes-a-siege-souple\/","title":{"rendered":"Vannes \u00e0 boule flottantes \u00e0 si\u00e8ge souple"},"content":{"rendered":"

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Vannes \u00e0 boule flottantes \u00e0 si\u00e8ge souple<\/h1>\n

Vannes \u00e0 boule industrielles<\/h2>\n

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Les vannes \u00e0 boule flottante sont actionn\u00e9es par un axe reli\u00e9 \u00e0 la partie sup\u00e9rieure de la boule et la font pivoter de 90 degr\u00e9s <\/strong>(ce qu’on appelle un quart de tour). \u00c0 mesure que la boule pivote, le passage s’ouvre ou se ferme, lib\u00e9rant ou arr\u00eatant l’\u00e9coulement du fluide. Lorsque la bille tourne sur son axe, la pression du flux pousse la bille contre son si\u00e8ge en aval, cr\u00e9ant ainsi un joint \u00e9tanche. Par cons\u00e9quent, les vannes \u00e0 bille flottante peuvent ne pas assurer une \u00e9tanch\u00e9it\u00e9 aussi efficace dans les applications \u00e0 tr\u00e8s basse pression apr\u00e8s une certaine usure du si\u00e8ge. En effet, la pression peut ne pas \u00eatre suffisante pour pousser la bille contre le si\u00e8ge en aval afin de cr\u00e9er un joint \u00e9tanche. Cependant, dans la plupart des applications, la pression en aval est suffisante pour maintenir une \u00e9tanch\u00e9it\u00e9 herm\u00e9tique bien apr\u00e8s que les si\u00e8ges aient commenc\u00e9 \u00e0 s’user.<\/strong><\/p>\n

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SI\u00c8GE MOELLEUX<\/strong><\/h3>\n

Les vannes \u00e0 si\u00e8ge souple ont des surfaces d’\u00e9tanch\u00e9it\u00e9 en mat\u00e9riaux thermoplastiques non m\u00e9talliques tels que le PTFE, le nylon, le PEEK et autres… Elles fonctionnent \u00e0 des temp\u00e9ratures de service inf\u00e9rieures \u00e0 270 \u00b0C (en fonction du mat\u00e9riau d’\u00e9tanch\u00e9it\u00e9). Dans des conditions appropri\u00e9es, les vannes \u00e0 si\u00e8ge souple peuvent offrir un niveau d’\u00e9tanch\u00e9it\u00e9 tr\u00e8s \u00e9lev\u00e9 tout au long de leur dur\u00e9e de vie, g\u00e9n\u00e9ralement sup\u00e9rieur \u00e0 celui d’une vanne m\u00e9tallique classique.<\/strong><\/p>\n

Cependant, les vannes \u00e0 si\u00e8ge souple ne sont pas adapt\u00e9es aux milieux corrosifs, aux fluides de process sales ou abrasifs.<\/strong> Ces conditions peuvent endommager le si\u00e8ge souple et entra\u00eener des fuites. Elles ne peuvent pas supporter les m\u00eames pressions que les vannes \u00e0 si\u00e8ge m\u00e9tallique. Bien que les vannes \u00e0 si\u00e8ge souple soient souvent moins co\u00fbteuses que les vannes \u00e0 si\u00e8ge m\u00e9tallique, ces derni\u00e8res sont g\u00e9n\u00e9ralement plus adapt\u00e9es lorsqu’un service intensif est requis. <\/p>\n

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