{"id":2112,"date":"2026-04-18T11:16:42","date_gmt":"2026-04-18T03:16:42","guid":{"rendered":"https:\/\/www.pansvalve.com\/?p=2112"},"modified":"2026-04-19T23:19:00","modified_gmt":"2026-04-19T15:19:00","slug":"single-block-bleed-vs-double-block-bleed-valves","status":"publish","type":"post","link":"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/","title":{"rendered":"Vannes \u00e0 simple bloc et \u00e0 double bloc et purge\u00a0: principales diff\u00e9rences expliqu\u00e9es"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Basculer la table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#What_is_a_Single_Block_and_Bleed_Valve\" >Qu&#039;est-ce qu&#039;une vanne \u00e0 bloc unique et \u00e0 purge ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#What_is_a_Double_Block_and_Bleed_Valve\" >Qu&#039;est-ce qu&#039;une vanne \u00e0 double blocage et purge ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#Key_Differences_Between_Single_Block_and_Bleed_and_Double_Block_and_Bleed\" >Principales diff\u00e9rences entre le blocage simple et la purge et le blocage double et la purge<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#Definition_DIB_What_is_DIB\" >D\u00e9finition DIB : Qu&#039;est-ce que DIB ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#Features_of_Double_Block_and_Bleed_Valves_by_PANS_Valve\" >Caract\u00e9ristiques des vannes \u00e0 double blocage et \u00e0 purge de PANS Valve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#Get_the_Full_DBB_Plug_Valve_Catalog_Request_a_Quote_in_24H\" >Obtenez le catalogue complet des vannes \u00e0 boisseau sph\u00e9rique DBB et demandez un devis en 24 heures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#Why_Choose_PANS_Valve\" >Pourquoi choisir la vanne PANS ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#When_Is_Double_Block_and_Bleed_Required_Practical_Selection_Guide\" >Quand faut-il proc\u00e9der \u00e0 une double purge\u00a0? Guide pratique de s\u00e9lection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/plug-valve\/single-block-bleed-vs-double-block-bleed-valves\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Une vanne \u00e0 simple isolement et purge (SBB) utilise une vanne d&#039;isolement et une vanne de purge pour l&#039;isolation et la d\u00e9compression dans un seul sens. Une vanne \u00e0 double isolement et purge (DBB) utilise deux vannes d&#039;isolement et une vanne de purge pour une double isolation bidirectionnelle, assurant ainsi la double \u00e9tanch\u00e9it\u00e9 requise par la norme API 6D dans les applications \u00e0 haut risque.<\/p>\n\n\n\n<p>Dans les industries manipulant des mati\u00e8res dangereuses (p\u00e9trole, gaz, produits chimiques), cette distinction est cruciale. Le choix appropri\u00e9 d\u00e9pend de la pression nominale de votre syst\u00e8me, du type de fluide et des exigences r\u00e9glementaires. Ce guide vous pr\u00e9sente les principales diff\u00e9rences, les applications et les cas o\u00f9 chaque conception est obligatoire.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_Single_Block_and_Bleed_Valve\"><\/span><strong>Qu&#039;est-ce qu&#039;une vanne \u00e0 bloc unique et \u00e0 purge ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Une vanne de sectionnement et de purge simple est con\u00e7ue pour interrompre l&#039;\u00e9coulement de fluides ou de gaz dans une seule direction et lib\u00e9rer toute pression emprisonn\u00e9e. La vanne se compose d&#039;une vanne de sectionnement et d&#039;une vanne de purge. La vanne de sectionnement interrompt l&#039;\u00e9coulement du fluide.&nbsp;<\/p>\n\n\n\n<p>La vanne de purge lib\u00e8re toute pression r\u00e9siduelle ou fluide emprisonn\u00e9 entre les deux vannes. Cette configuration garantit que toute accumulation de pression est \u00e9vacu\u00e9e en toute s\u00e9curit\u00e9, \u00e9vitant ainsi les accidents ou les fuites.<\/p>\n\n\n\n<p>La vanne de blocage et de purge est g\u00e9n\u00e9ralement utilis\u00e9e dans les situations o\u00f9 l&#039;isolement d&#039;un c\u00f4t\u00e9 d&#039;un syst\u00e8me est suffisant. Ces vannes sont souvent install\u00e9es dans des syst\u00e8mes plus petits et moins critiques o\u00f9 une isolation compl\u00e8te des deux c\u00f4t\u00e9s n&#039;est pas n\u00e9cessaire.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_Double_Block_and_Bleed_Valve\"><\/span><strong>Qu&#039;est-ce qu&#039;une vanne \u00e0 double blocage et purge ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>UN <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/dbb-plug-valve\/\">vanne \u00e0 double blocage et purge<\/a> La vanne DBB (double isolement et purge) est un syst\u00e8me con\u00e7u pour isoler compl\u00e8tement une section de canalisation des deux c\u00f4t\u00e9s. Elle comporte deux vannes d&#039;arr\u00eat et une vanne de purge. Ce syst\u00e8me garantit une isolation totale en interrompant le flux dans les deux sens et en rel\u00e2chant en toute s\u00e9curit\u00e9 la pression r\u00e9siduelle par la vanne de purge. Cette configuration est indispensable lors de la manipulation de mati\u00e8res dangereuses. La s\u00e9curit\u00e9 et la pr\u00e9vention des fuites sont primordiales.<\/p>\n\n\n\n<p>La vanne \u00e0 double blocage et purge est couramment utilis\u00e9e dans les industries telles que le p\u00e9trole et le gaz, o\u00f9 m\u00eame une petite fuite peut pr\u00e9senter des risques de s\u00e9curit\u00e9 importants. La signification DBB (double blocage et purge) fait r\u00e9f\u00e9rence \u00e0 la capacit\u00e9 du syst\u00e8me \u00e0 fournir une double isolation avec lib\u00e9ration de pression. Ils offrent un niveau de s\u00e9curit\u00e9 plus \u00e9lev\u00e9 que les syst\u00e8mes \u00e0 simple blocage et purge.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Qu&#039;est-ce qu&#039;une vanne \u00e0 double blocage et purge (norme API 6D)\u00a0?<\/strong><\/h3>\n\n\n\n<p>Une vanne \u00e0 double blocage et purge (commun\u00e9ment appel\u00e9e vanne DBB) est un syst\u00e8me d&#039;isolation de canalisation con\u00e7u pour r\u00e9pondre aux exigences suivantes : <a href=\"https:\/\/www.api.org\/products-and-services\/standards\/important-standards-announcements\/spec6d\">API 6D<\/a> D\u00e9finition et exigences de conformit\u00e9 du syst\u00e8me de double isolement et purge. Le syst\u00e8me comprend deux vannes d&#039;isolement ind\u00e9pendantes et une vanne de purge, assurant une isolation compl\u00e8te en amont et en aval.<\/p>\n\n\n\n<p><strong>Comment \u00e7a marche\u00a0:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>La premi\u00e8re vanne de blocage<\/strong> arr\u00eate le flux provenant de l&#039;entr\u00e9e<\/li>\n\n\n\n<li><strong>La deuxi\u00e8me vanne de blocage<\/strong> arr\u00eate le flux du c\u00f4t\u00e9 sortie<\/li>\n\n\n\n<li><strong>Valve de purge<\/strong> (\u00e9galement appel\u00e9e soupape de purge) lib\u00e8re en toute s\u00e9curit\u00e9 toute pression ou tout fluide emprisonn\u00e9 entre les deux si\u00e8ges du bloc.<\/li>\n<\/ul>\n\n\n\n<p>Cette conception \u00e0 double isolation est obligatoire selon la norme API 6D pour les syst\u00e8mes de canalisations transportant des mati\u00e8res dangereuses, notamment le p\u00e9trole brut, le gaz naturel, le gaz de p\u00e9trole liqu\u00e9fi\u00e9 (GPL) et les produits chimiques toxiques. Gr\u00e2ce \u00e0 leurs surfaces d&#039;\u00e9tanch\u00e9it\u00e9 redondantes et \u00e0 leur syst\u00e8me de d\u00e9charge de pression, les vannes DBB constituent la norme de s\u00e9curit\u00e9 essentielle pour les applications \u00e0 haut risque o\u00f9 une simple fuite peut engendrer des risques environnementaux ou op\u00e9rationnels importants.<\/p>\n\n\n\n<p>Quand un syst\u00e8me de double isolement et purge est-il requis\u00a0? Tout syst\u00e8me transportant des fluides toxiques, inflammables ou corrosifs \u00e0 haute pression et n\u00e9cessitant une isolation pour maintenance sans risque de d\u00e9versement doit utiliser un syst\u00e8me de vannes \u00e0 double isolement et purge conforme \u00e0 la norme API 6D.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_Differences_Between_Single_Block_and_Bleed_and_Double_Block_and_Bleed\"><\/span><strong>Principales diff\u00e9rences entre le blocage simple et la purge et le blocage double et la purge<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"892\" height=\"547\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/10\/screenshot-20260419-231205.png\" alt=\"\" class=\"wp-image-4245\" srcset=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/10\/screenshot-20260419-231205.png 892w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/10\/screenshot-20260419-231205-300x184.png 300w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/10\/screenshot-20260419-231205-768x471.png 768w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/10\/screenshot-20260419-231205-18x12.png 18w\" sizes=\"(max-width: 892px) 100vw, 892px\" \/><\/figure>\n\n\n\n<style>\r\n  .valve-table-container {\r\n    margin-top: 40px;\r\n    font-family: Arial, sans-serif;\r\n  }\r\n\r\n  .valve-title {\r\n    font-size: 22px;\r\n    font-weight: bold;\r\n    color: #D70C19;\r\n    margin-bottom: 12px;\r\n    text-align: left;\r\n    border-left: 5px solid #D70C19;\r\n    padding-left: 10px;\r\n  }\r\n\r\n  .valve-table {\r\n    width: 100%;\r\n    border-collapse: collapse;\r\n    font-family: Arial, sans-serif;\r\n    margin-top: 10px;\r\n  }\r\n\r\n  .valve-table thead {\r\n    background-color: #D70C19;\r\n    color: #fff;\r\n  }\r\n\r\n  .valve-table th, .valve-table td {\r\n    padding: 14px 16px;\r\n    text-align: left;\r\n    border-bottom: 1px solid #ddd;\r\n    transition: background-color 0.3s ease;\r\n  }\r\n\r\n  .valve-table tbody tr:hover {\r\n    background-color: #f9e4e5;\r\n  }\r\n\r\n  .valve-table tbody td:first-child {\r\n    font-weight: bold;\r\n    color: #D70C19;\r\n  }\r\n<\/style>\r\n\r\n<div class=\"valve-table-container\">\r\n  <div class=\"valve-title\">Vannes \u00e0 bloc simple ou \u00e0 double bloc et purge<\/div>\r\n  <table class=\"valve-table\">\r\n    <thead>\r\n      <tr>\r\n        <th>Fonctionnalit\u00e9<\/th>\r\n        <th>Blocage et purge simples (SBB)<\/th>\r\n        <th>Double blocage et purge (DBB)<\/th>\r\n      <\/tr>\r\n    <\/thead>\r\n    <tbody>\r\n      <tr>\r\n        <td>Isolement<\/td>\r\n        <td>Une vanne d&#039;isolement + une purge<\/td>\r\n        <td>Deux vannes d&#039;isolement + une purge<\/td>\r\n      <\/tr>\r\n      <tr>\r\n        <td>Scellage<\/td>\r\n        <td>unidirectionnel<\/td>\r\n        <td>\u00c9tanch\u00e9it\u00e9 bidirectionnelle<\/td>\r\n      <\/tr>\r\n      <tr>\r\n        <td>Application<\/td>\r\n        <td>Pipelines de processus standard<\/td>\r\n        <td>Syst\u00e8mes critiques comme le p\u00e9trole et le gaz<\/td>\r\n      <\/tr>\r\n      <tr>\r\n        <td>Niveau de s\u00e9curit\u00e9<\/td>\r\n        <td>Isolation de base<\/td>\r\n        <td>Isolation et s\u00e9curit\u00e9 renforc\u00e9es<\/td>\r\n      <\/tr>\r\n      <tr>\r\n        <td>Co\u00fbt et espace<\/td>\r\n        <td>Co\u00fbt r\u00e9duit, conception compacte<\/td>\r\n        <td>Co\u00fbt plus \u00e9lev\u00e9, plus de composants<\/td>\r\n      <\/tr>\r\n    <\/tbody>\r\n  <\/table>\r\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>La principale diff\u00e9rence entre les syst\u00e8mes \u00e0 simple blocage et \u00e0 purge et les syst\u00e8mes \u00e0 double blocage et \u00e0 purge r\u00e9side dans le nombre de vannes de blocage utilis\u00e9es et le niveau d&#039;isolation qu&#039;elles fournissent. Voici les principales distinctions :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Nombre de vannes d&#039;arr\u00eat<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blocage simple et purge<\/strong>:Contient une vanne de blocage et une vanne de purge.<\/li>\n\n\n\n<li><strong>Double blocage et purge<\/strong>:Dispose de deux vannes de blocage et d&#039;une vanne de purge.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Niveau d&#039;isolement<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blocage simple et purge<\/strong>: Assure une isolation dans une direction. Cela signifie qu&#039;il arr\u00eate le d\u00e9bit d&#039;un c\u00f4t\u00e9 du syst\u00e8me tout en permettant la lib\u00e9ration de la pression.<\/li>\n\n\n\n<li><strong>Double blocage et purge<\/strong>: Offre une isolation compl\u00e8te des deux c\u00f4t\u00e9s. Il emp\u00eache l&#039;\u00e9coulement dans les deux sens et permet la lib\u00e9ration de la pression entre les vannes de blocage.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Application<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blocage simple et purge<\/strong>:Utilis\u00e9 dans les syst\u00e8mes plus simples et moins critiques o\u00f9 l&#039;isolation d&#039;un c\u00f4t\u00e9 est suffisante.<\/li>\n\n\n\n<li><strong>Double blocage et purge<\/strong>:N\u00e9cessaire dans les environnements \u00e0 haut risque o\u00f9 un isolement complet est essentiel pour pr\u00e9venir les accidents et assurer la s\u00e9curit\u00e9.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Definition_DIB_What_is_DIB\"><\/span><strong>D\u00e9finition DIB : Qu&#039;est-ce que DIB ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>La d\u00e9finition DIB fait r\u00e9f\u00e9rence \u00e0 Double Isolation and Bleed (double isolation et purge). Similaires au DB&amp;B, les syst\u00e8mes DIB fournissent deux surfaces d&#039;assise ind\u00e9pendantes pour l&#039;isolation. La diff\u00e9rence est que les syst\u00e8mes DIB offrent plus de flexibilit\u00e9 en permettant \u00e0 un si\u00e8ge de fonctionner comme une sauvegarde d&#039;urgence. Dans une vanne DIB, l&#039;un des si\u00e8ges peut agir comme un joint secondaire, ce qui est b\u00e9n\u00e9fique dans les cas o\u00f9 un si\u00e8ge pourrait tomber en panne.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Caract\u00e9ristiques des vannes : DBB et DIB\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7LutmNdy2lw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Features_of_Double_Block_and_Bleed_Valves_by_PANS_Valve\"><\/span><strong>Caract\u00e9ristiques des vannes \u00e0 double blocage et \u00e0 purge de PANS Valve<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Lors de la s\u00e9lection d&#039;une vanne DBB, la qualit\u00e9 et la fiabilit\u00e9 sont essentielles. <a href=\"https:\/\/www.pansvalve.com\/fr\/blog\/single-block-bleed-vs-double-block-bleed-valves\/\">Vanne de casseroles<\/a>, fabricant professionnel de vannes, propose des vannes \u00e0 double sectionnement et purge de haute qualit\u00e9, con\u00e7ues pour la s\u00e9curit\u00e9 et l&#039;efficacit\u00e9. Voici quelques-unes de leurs principales caract\u00e9ristiques. <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/dbb-plug-valve\/\">solutions de double blocage et de purge<\/a>:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Double \u00e9tanch\u00e9it\u00e9 pour mati\u00e8res dangereuses<\/strong><\/h3>\n\n\n\n<p>Les vannes \u00e0 double blocage et purge de PANS Valve sont parfaites pour la manipulation de mati\u00e8res dangereuses telles que le k\u00e9ros\u00e8ne d&#039;aviation, le gaz naturel et le gaz de p\u00e9trole liqu\u00e9fi\u00e9. Ces mati\u00e8res sont hautement inflammables. PANS Valve utilise une bride centrale avec une structure \u00e0 double joint. Le joint torique et le joint d&#039;\u00e9tanch\u00e9it\u00e9 offrent une protection suppl\u00e9mentaire contre les fuites.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Mat\u00e9riaux durables et r\u00e9sistants \u00e0 la corrosion<\/strong><\/h3>\n\n\n\n<p>Les pi\u00e8ces cl\u00e9s de la vanne, telles que la cavit\u00e9 du corps de vanne et le bloc coulissant, sont trait\u00e9es et rev\u00eatues pour r\u00e9sister \u00e0 la corrosion, \u00e0 l&#039;\u00e9rosion et \u00e0 l&#039;usure. Cela rend les vannes plus durables et plus r\u00e9sistantes, m\u00eame dans des environnements difficiles.<\/p>\n\n\n\n<style>\n  .cta-banner-card {\n    max-width: 960px;\n    margin: 60px auto;\n    border-radius: 16px;\n    overflow: hidden;\n    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);\n    transition: transform 0.4s ease, box-shadow 0.4s ease;\n  }\n\n  .cta-banner-card:hover {\n    transform: translateY(-6px);\n    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.22);\n  }\n\n  .cta-banner-inner {\n    background: linear-gradient(to bottom, #F76C6C, #D70C19);\n    padding: 50px 30px;\n    text-align: center;\n    color: #fff;\n    font-family: Arial, sans-serif;\n  }\n\n  .cta-banner-inner h2 {\n    font-size: 24px;\n    font-weight: 600;\n    max-width: 800px;\n    margin: 0 auto 32px auto;\n    line-height: 1.4;\n  }\n\n  .cta-buttons {\n    display: flex;\n    justify-content: center;\n    gap: 20px;\n    flex-wrap: wrap;\n  }\n\n  .cta-buttons a {\n    background-color: #fff;\n    color: #D70C19;\n    border: 2px solid #D70C19;\n    text-decoration: none;\n    padding: 12px 28px;\n    font-size: 16px;\n    font-weight: 500;\n    border-radius: 6px;\n    transition: transform 0.3s ease, box-shadow 0.3s ease;\n    min-width: 180px;\n    text-align: center;\n  }\n\n  .cta-buttons a:hover {\n    transform: translateY(-2px);\n    box-shadow: 0 4px 12px rgba(0,0,0,0.1);\n  }\n\n  @media (max-width: 768px) {\n    .cta-buttons {\n      flex-direction: column;\n      align-items: center;\n    }\n\n    .cta-buttons a {\n      width: 100%;\n      max-width: 300px;\n    }\n  }\n<\/style>\n\n<div class=\"cta-banner-card\">\n  <div class=\"cta-banner-inner\">\n    <h2><span class=\"ez-toc-section\" id=\"Get_the_Full_DBB_Plug_Valve_Catalog_Request_a_Quote_in_24H\"><\/span>Obtenez le catalogue complet des vannes \u00e0 boisseau sph\u00e9rique DBB et demandez un devis en 24 heures<span class=\"ez-toc-section-end\"><\/span><\/h2>\n    <div class=\"cta-buttons\">\n      <a href=\"https:\/\/www.pansvalve.com\/fr\/contact-us\/\" target=\"_blank\">Obtenez un devis<\/a>\n      <a href=\"https:\/\/www.pansvalve.com\/fr\/download\/\" target=\"_blank\">T\u00e9l\u00e9charger le catalogue (PDF)<\/a>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Syst\u00e8mes de d\u00e9compression<\/strong><\/h3>\n\n\n\n<p>PANS Valve propose trois syst\u00e8mes de d\u00e9charge de pression diff\u00e9rents pour les vannes \u00e0 double blocage et purge. Ceux-ci comprennent :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9compression manuelle pour fonctionnement manuel.<\/li>\n\n\n\n<li>D\u00e9charge de pression diff\u00e9rentielle pour fonctionnement manuel et \u00e9lectrique.<\/li>\n\n\n\n<li>D\u00e9compression automatique pour vannes \u00e9lectriques. Cela garantit l&#039;\u00e9vacuation en toute s\u00e9curit\u00e9 de toute accumulation de pression dans la cavit\u00e9 de la vanne, \u00e9vitant ainsi tout dommage ou accident.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Fonctionnement flexible<\/strong><\/h3>\n\n\n\n<p>La vanne de purge \u00e0 double bloc de PANS Valve est dot\u00e9e d&#039;une structure \u00e0 fente en forme de L dans le m\u00e9canisme de fonctionnement. Cela permet \u00e0 la vanne de fonctionner de mani\u00e8re flexible, avec un mouvement fluide et une manipulation facile.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Faible entretien<\/strong><\/h3>\n\n\n\n<p>La vanne est dot\u00e9e d&#039;une fen\u00eatre permettant le r\u00e9glage et l&#039;entretien en ligne de la garniture. Cela r\u00e9duit les temps d&#039;arr\u00eat et garantit que la vanne reste s\u00fbre et fonctionnelle pendant le fonctionnement.<\/p>\n\n\n\n<style>\n  .product-card {\n    display: flex;\n    flex-direction: row;\n    align-items: center;\n    border: 1px solid #eee;\n    border-radius: 12px;\n    overflow: hidden;\n    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);\n    transition: transform 0.3s ease, box-shadow 0.3s ease;\n    max-width: 960px;\n    margin: 40px auto;\n    background-color: #fff;\n  }\n\n  .product-card:hover {\n    transform: translateY(-6px);\n    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);\n  }\n\n  .product-image {\n    flex: 1;\n    min-width: 260px;\n    max-width: 50%;\n  }\n\n  .product-image img {\n    width: 100%;\n    height: 100%;\n    object-fit: cover;\n    display: block;\n  }\n\n  .product-info {\n    flex: 1;\n    padding: 30px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    align-items: center;\n    text-align: center;\n  }\n\n  .product-info h3 {\n    font-size: 22px;\n    color: #333;\n    margin-bottom: 24px;\n    font-weight: 600;\n    max-width: 90%;\n  }\n\n  .product-button-wrapper {\n    display: flex;\n    justify-content: center;\n    align-items: center;\n  }\n\n  .product-info a {\n    border: 2px solid #D70C19;\n    color: #D70C19;\n    text-decoration: none;\n    padding: 10px 20px;\n    font-weight: 500;\n    font-size: 16px;\n    border-radius: 6px;\n    transition: all 0.3s ease;\n    display: inline-block;\n    text-align: center;\n  }\n\n  .product-info a:hover {\n    border-color: #333333;\n    color: #333333;\n    background-color: #f9f9f9;\n  }\n\n  \/* Responsive - Mobile layout *\/\n  @media (max-width: 768px) {\n    .product-card {\n      flex-direction: column;\n    }\n\n    .product-image, .product-info {\n      max-width: 100%;\n      width: 100%;\n    }\n\n    .product-info {\n      padding: 20px;\n    }\n\n    .product-info h3 {\n      font-size: 20px;\n    }\n  }\n<\/style>\n\n<div class=\"product-card\">\n  <div class=\"product-image\">\n    <img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/01\/3-dbb-plug-valve.webp\" alt=\"Vanne \u00e0 boisseau DBB\">\n  <\/div>\n  <div class=\"product-info\">\n    <h3>Con\u00e7us pour la s\u00e9curit\u00e9 \u2013 Vannes \u00e0 boisseau DBB pour applications \u00e0 haut risque<\/h3>\n    <div class=\"product-button-wrapper\">\n      <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/dbb-plug-valve\/\" target=\"_blank\">Voir les d\u00e9tails du produit<\/a>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Choose_PANS_Valve\"><\/span><strong>Pourquoi choisir la vanne PANS ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Depuis plus de 36 ans, <a href=\"https:\/\/www.pansvalve.com\/fr\">Vanne de casseroles<\/a> est une marque de confiance dans le secteur des vannes. Leurs produits sont connus pour leur durabilit\u00e9, leur fabrication de haute qualit\u00e9 et leurs caract\u00e9ristiques de s\u00e9curit\u00e9. Voici quelques-unes des principales raisons de choisir PANS Valve pour vos besoins en vannes DBB\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>5 bases de fabrication<\/strong>: PANS Valve dispose d&#039;une capacit\u00e9 de production \u00e9tendue avec plus de 25 000 m\u00e8tres carr\u00e9s d&#039;espace d&#039;atelier.<\/li>\n\n\n\n<li><strong>Rendement \u00e9lev\u00e9<\/strong>:Avec une production annuelle de plus de 3 000 tonnes de vannes, ils peuvent r\u00e9pondre aux exigences de projets industriels \u00e0 grande \u00e9chelle.<\/li>\n\n\n\n<li><strong>D\u00e9lai d&#039;ex\u00e9cution rapide<\/strong>:Les clients peuvent s&#039;attendre \u00e0 recevoir des devis et des plans dans les 24 heures. De plus, PANS Valve peut livrer la plupart des produits dans un d\u00e9lai de 20 jours, gr\u00e2ce \u00e0 son large stock d&#039;embryons bruts.<\/li>\n\n\n\n<li><strong>Solution unique<\/strong>: PANS Valve propose une large gamme de vannes, notamment des vannes \u00e0 boisseau sph\u00e9rique, <a href=\"https:\/\/www.pansvalve.com\/fr\/ball-valve-collection\/\">robinets \u00e0 tournant sph\u00e9rique<\/a>, <a href=\"https:\/\/www.pansvalve.com\/fr\/globe-valve-collection\/\">vannes \u00e0 soupape<\/a>, vannes \u00e0 guillotine et plus encore. Ils r\u00e9pondent aux besoins de tout projet industriel.<\/li>\n<\/ul>\n\n\n\n<p><a href=\"https:\/\/www.pansvalve.com\/fr\/contact-us\/\">Demandez un devis d\u00e8s maintenant\u00a0! &gt;&gt;<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_Is_Double_Block_and_Bleed_Required_Practical_Selection_Guide\"><\/span><strong>Quand faut-il proc\u00e9der \u00e0 une double purge\u00a0? Guide pratique de s\u00e9lection<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Le choix entre SBB et DBB d\u00e9pend de trois facteurs\u00a0: la pression du syst\u00e8me, le niveau de risque li\u00e9 au fluide et la conformit\u00e9 r\u00e9glementaire.<\/p>\n\n\n\n<p><strong>La technique de bloc et de saignement unique (SBB) est suffisante lorsque\u00a0:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La pression de service est inf\u00e9rieure \u00e0 2 000 PSI (14 MPa).<\/li>\n\n\n\n<li>Le fluide est non toxique et ininflammable (par exemple, eau, vapeur, air).<\/li>\n\n\n\n<li>Le syst\u00e8me n&#039;est pas critique (les arr\u00eats pour maintenance de routine sont acceptables).<\/li>\n\n\n\n<li>Aucune norme de s\u00e9curit\u00e9 API 6D ou comparable ne s&#039;applique<\/li>\n\n\n\n<li>Les contraintes de co\u00fbt et d&#039;espace sont des pr\u00e9occupations primordiales.<\/li>\n<\/ul>\n\n\n\n<p><em>Exemple : Stations d&#039;\u00e9puration, isolation des syst\u00e8mes CVC, conduites de process basse pression<\/em><\/p>\n\n\n\n<p><strong>La double h\u00e9mostase (DBB) est obligatoire lorsque\u00a0:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La pression de service d\u00e9passe 2\u00a0000\u00a0PSI, ou le syst\u00e8me utilise une diff\u00e9rence de pression \u00e9lev\u00e9e (DP &gt; 1\u00a0000\u00a0PSI \u00e0 travers la vanne).<\/li>\n\n\n\n<li>Le fluide est toxique, inflammable ou corrosif, notamment le p\u00e9trole brut, le gaz naturel, le GPL, l&#039;ammoniac, le chlore ou des produits chimiques dangereux.<\/li>\n\n\n\n<li>Ce syst\u00e8me est essentiel \u00e0 la s\u00e9curit\u00e9\u00a0; toute d\u00e9faillance ou fuite pr\u00e9sente des risques pour l\u2019environnement ou le personnel.<\/li>\n\n\n\n<li>La conformit\u00e9 \u00e0 la norme API 6D est requise (ol\u00e9oducs, transport de gaz, transport de produits chimiques).<\/li>\n\n\n\n<li>La maintenance des pipelines n\u00e9cessite une isolation sans rejet (protection de l&#039;environnement).<\/li>\n\n\n\n<li>L&#039;application concerne l&#039;isolation des cuves de r\u00e9acteur, des cuves de s\u00e9parateur ou des \u00e9quipements sous pression<\/li>\n<\/ul>\n\n\n\n<p><em>Exemples : plateformes p\u00e9troli\u00e8res offshore, transport de gaz naturel, usines chimiques, installations de GNL, pipelines d&#039;ammoniac<\/em><\/p>\n\n\n\n<p><strong>D\u00e9clencheur r\u00e9glementaire\u00a0:<\/strong> Si votre syst\u00e8me est conforme aux normes API 6D, ASME B31.3 (produits chimiques), B31.4 (transport de liquides), B31.8 (gaz) ou \u00e0 des normes r\u00e9gionales \u00e9quivalentes, la double barri\u00e8re de s\u00e9curit\u00e9 (DBB) est obligatoire. M\u00eame si le fonctionnement actuel semble s\u00fbr, le passage d&#039;une double barri\u00e8re de s\u00e9curit\u00e9 (SBB) \u00e0 une double barri\u00e8re de s\u00e9curit\u00e9 vous prot\u00e8ge contre les changements de fluides, les augmentations de pression ou les audits r\u00e9glementaires futurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Il est important de comprendre la diff\u00e9rence entre les vannes \u00e0 simple blocage et \u00e0 purge et les vannes \u00e0 double blocage et \u00e0 purge pour les industries qui n\u00e9cessitent des mesures de s\u00e9curit\u00e9 fiables. Les vannes \u00e0 simple blocage et \u00e0 purge fournissent une isolation de base d&#039;un c\u00f4t\u00e9. Les vannes \u00e0 double blocage et \u00e0 purge offrent une isolation compl\u00e8te des deux c\u00f4t\u00e9s, ce qui les rend id\u00e9ales pour les environnements \u00e0 haut risque.<\/p>\n\n\n\n<p>Si vous recherchez des vannes DBB de haute qualit\u00e9, <a href=\"https:\/\/www.pansvalve.com\/fr\">Vanne de casseroles<\/a> offre une solution robuste. Leurs vannes sont durables, fiables et con\u00e7ues dans un souci de s\u00e9curit\u00e9. Elles sont parfaites pour les industries manipulant des mati\u00e8res dangereuses. Que vous ayez besoin d&#039;une vanne pour le k\u00e9ros\u00e8ne d&#039;aviation, le gaz naturel ou le gaz de p\u00e9trole liqu\u00e9fi\u00e9, PANS Valve poss\u00e8de l&#039;expertise et la gamme de produits pour r\u00e9pondre \u00e0 vos besoins.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>R\u00e9f\u00e9rence<\/summary>\n<ol class=\"wp-block-list\">\n<li>Qu&#039;est-ce que la vanne \u00e0 boisseau sph\u00e9rique SBB et comment fonctionne-t-elle (<a href=\"https:\/\/www.dombor.com\/what-is-single-block-and-bleed-valve\/\">1<\/a>)<\/li>\n\n\n\n<li>Fonction de la vanne de blocage et de purge (<a href=\"https:\/\/chemicalengineeringworld.com\/block-and-bleed-valve-function\/\">2<\/a>)<\/li>\n<\/ol>\n<\/details>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>A single block and bleed (SBB) valve uses one block valve plus one bleed valve for isolation and pressure relief in one direction. A double block and bleed (DBB) valve uses two block valves plus one bleed valve for dual isolation from both directions, providing the dual seating required by API 6D in high-hazard applications. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[158,187],"tags":[],"class_list":["post-2112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-plug-valve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Single Block vs Double Block and Bleed Valves: Key Differences Explained<\/title>\n<meta name=\"description\" content=\"Understanding the differences between Single Block and Bleed and Double Block and Bleed Valves and find the best solution for your industry needs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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