{"id":14461,"date":"2025-12-18T08:00:00","date_gmt":"2025-12-18T00:00:00","guid":{"rendered":"https:\/\/www.xintaivalves.com\/?p=14461"},"modified":"2025-12-19T13:53:10","modified_gmt":"2025-12-19T05:53:10","slug":"bypass-gate-valve-principle-pros-cons-cost","status":"publish","type":"post","link":"https:\/\/www.xintaivalves.com\/fr\/blog\/gate-valve\/bypass-gate-valve-principle-pros-cons-cost\/","title":{"rendered":"Vannes \u00e0 guillotine de d\u00e9rivation\u00a0: principe de fonctionnement, avantages, inconv\u00e9nients et analyse des co\u00fbts"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 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 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.xintaivalves.com\/fr\/blog\/gate-valve\/bypass-gate-valve-principle-pros-cons-cost\/#Why_Need_a_Bypass_on_Gate_Valves\" >Pourquoi a-t-on besoin d&#039;un by-pass sur les vannes \u00e0 guillotine ?<\/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.xintaivalves.com\/fr\/blog\/gate-valve\/bypass-gate-valve-principle-pros-cons-cost\/#The_Operational_Sequence\" >La s\u00e9quence op\u00e9rationnelle<\/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.xintaivalves.com\/fr\/blog\/gate-valve\/bypass-gate-valve-principle-pros-cons-cost\/#Cost_Analytics_and_ROI\" >Analyse des co\u00fbts et retour sur investissement<\/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.xintaivalves.com\/fr\/blog\/gate-valve\/bypass-gate-valve-principle-pros-cons-cost\/#Pros_and_Cons\" >Avantages et inconv\u00e9nients<\/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.xintaivalves.com\/fr\/blog\/gate-valve\/bypass-gate-valve-principle-pros-cons-cost\/#Summary\" >R\u00e9sum\u00e9<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">Une vanne de d\u00e9rivation utilise un tuyau secondaire plus petit reliant les c\u00f4t\u00e9s amont et aval pour \u00e9galiser la pression avant l&#039;ouverture de la vanne principale, \u00e9vitant ainsi d&#039;endommager la tige et r\u00e9duisant la force n\u00e9cessaire pour actionner le volant.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce simple ajout transforme un objet quasiment inamovible en un \u00e9quipement facile \u00e0 manipuler, notamment dans les conduites de vapeur ou d&#039;eau \u00e0 haute pression.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous avez d\u00e9j\u00e0 essay\u00e9 d&#039;ouvrir une porte dans une pi\u00e8ce sous haute pression, vous savez \u00e0 quel point elle semble verrouill\u00e9e. Les m\u00eames principes physiques s&#039;appliquent \u00e0 <a href=\"https:\/\/www.xintaivalves.com\/fr\/blog\/understanding-industrial-valve-connections-and-fittings-types\/\" target=\"_blank\" rel=\"noreferrer noopener\">pipelines industriels<\/a>. Le syst\u00e8me de d\u00e9rivation est la cl\u00e9 qui permet de rel\u00e2cher cette pression.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Need_a_Bypass_on_Gate_Valves\"><\/span>Pourquoi a-t-on besoin d&#039;un by-pass sur les vannes \u00e0 guillotine ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La principale raison pour laquelle vous installez un <a href=\"https:\/\/www.xintaivalves.com\/fr\/gate-valve-manufacturer\/\" target=\"_blank\" rel=\"noreferrer noopener\">robinet-vanne<\/a> Le bypass permet de lutter contre le \u201c Delta P \u201d, qui est un terme technique d\u00e9signant la pression diff\u00e9rentielle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imaginez une conduite de vapeur de 30 cm de diam\u00e8tre. En amont, la pression atteint 70 bars (1\u00a0000 PSI). En aval, la conduite est vide et la pression est de 0 PSI. Cette diff\u00e9rence de pression de 70 bars (1\u00a0000 PSI) exerce une force consid\u00e9rable sur la plaque de la vanne contre son si\u00e8ge aval. Le frottement est immense.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous forcez la rotation de la poign\u00e9e principale, vous risquez de casser la tige m\u00e9tallique ou d&#039;endommager le filetage avant m\u00eame que la vanne ne bouge. En ouvrant d&#039;abord le petit tuyau de d\u00e9rivation, vous permettez \u00e0 la vapeur haute pression de contourner la vanne principale et de remplir le c\u00f4t\u00e9 vide. Une fois la pression \u00e0 peu pr\u00e8s \u00e9gale des deux c\u00f4t\u00e9s, le frottement dispara\u00eet. Vous pouvez alors soulever la vanne principale d&#039;une seule main.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_Operational_Sequence\"><\/span>La s\u00e9quence op\u00e9rationnelle<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"562\" height=\"375\" src=\"https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/12\/relief-diagram.webp\" alt=\"\" class=\"wp-image-14464\" style=\"width:300px\" srcset=\"https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/12\/relief-diagram.webp 562w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/12\/relief-diagram-300x200.webp 300w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/12\/relief-diagram-18x12.webp 18w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">L&#039;utilisation d&#039;une vanne \u00e0 guillotine avec d\u00e9rivation n\u00e9cessite le respect d&#039;un ordre d&#039;op\u00e9rations pr\u00e9cis pour \u00eatre efficace. Si vous omettez une \u00e9tape, vous perdez l&#039;avantage.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ouvrez d&#039;abord le canal de d\u00e9rivation<\/strong>Vous tournez la petite vanne sur la boucle lat\u00e9rale. Vous entendrez le liquide s&#039;\u00e9couler en trombe.<\/li>\n\n\n\n<li><strong>Attendez l&#039;\u00e9quilibre<\/strong>Surveillez les manom\u00e8tres. Une fois que la pression en aval aura atteint celle en amont, le bruit diminuera.<\/li>\n\n\n\n<li><strong>Ouvrir la vanne principale<\/strong>Maintenant que la charge lourde a \u00e9t\u00e9 retir\u00e9e du si\u00e8ge, vous ouvrez la vanne de d\u00e9rivation principale.<\/li>\n\n\n\n<li><strong>Fermer la voie de contournement<\/strong>Une fois que la conduite principale fonctionne \u00e0 plein r\u00e9gime, on ferme g\u00e9n\u00e9ralement la boucle de d\u00e9rivation.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cost_Analytics_and_ROI\"><\/span>Analyse des co\u00fbts et retour sur investissement<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c0 premi\u00e8re vue, l&#039;ajout d&#039;un bypass semble \u00eatre un gaspillage d&#039;argent. On paie pour de la tuyauterie suppl\u00e9mentaire, une petite vanne suppl\u00e9mentaire et plus de main-d&#039;\u0153uvre de soudure. Cependant, les \u00e9conomies se font sentir au niveau du mat\u00e9riel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gr\u00e2ce au syst\u00e8me de d\u00e9rivation qui \u00e9limine le besoin de surmonter un couple de d\u00e9marrage important, il est possible d&#039;installer un actionneur beaucoup plus petit et moins co\u00fbteux sur la vanne principale. Au lieu d&#039;acheter un moteur \u00e9lectrique imposant ($20\u00a0000) uniquement pour l&#039;amor\u00e7age de la vanne, un moteur ($5\u00a0000) dimensionn\u00e9 pour le couple de fonctionnement plut\u00f4t que pour le couple de d\u00e9marrage peut \u00eatre utilis\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pros_and_Cons\"><\/span>Avantages et inconv\u00e9nients<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les bons trucs<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>S\u00e9curit\u00e9<\/strong>Cela emp\u00eache les op\u00e9rateurs de se faire mal au dos ou d&#039;utiliser des \u201c barres de triche \u201d pour forcer les vannes bloqu\u00e9es.<\/li>\n\n\n\n<li><strong>Protection des \u00e9quipements<\/strong>Il emp\u00eache l&#039;arriv\u00e9e brutale de vapeur dans les tuyaux froids, ce qui peut provoquer un choc thermique. Le syst\u00e8me de d\u00e9rivation permet un r\u00e9chauffement progressif.<\/li>\n\n\n\n<li><strong>Long\u00e9vit\u00e9<\/strong>Cela prot\u00e8ge les si\u00e8ges et les tiges de l&#039;usure par frottement.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Les inconv\u00e9nients<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Points de fuite<\/strong>Une vanne \u00e0 guillotine avec d\u00e9rivation comporte davantage de joints soud\u00e9s et de joints d&#039;\u00e9tanch\u00e9it\u00e9, cr\u00e9ant ainsi plus d&#039;endroits potentiels o\u00f9 des fuites peuvent se produire.<\/li>\n\n\n\n<li><strong>Espace<\/strong>La boucle suppl\u00e9mentaire d\u00e9passe du corps de la vanne, occupant un espace pr\u00e9cieux dans les supports de tuyauterie \u00e9troits.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>R\u00e9sum\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La vanne de d\u00e9rivation est un \u00e9l\u00e9ment essentiel des syst\u00e8mes haute pression. Elle utilise une petite boucle d&#039;\u00e9quilibrage pour compenser les forces, ce qui permet de r\u00e9aliser des \u00e9conomies sur les actionneurs et d&#039;\u00e9viter la rupture des tiges de vanne.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.xintaivalves.com\/fr\/product\/\" target=\"_blank\" rel=\" noreferrer noopener\"><img decoding=\"async\" width=\"1024\" height=\"371\" src=\"https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2-1024x371.webp\" alt=\"fabricant de vannes XINTAI, leader de l&#039;industrie\" class=\"wp-image-9208\" srcset=\"https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2-1024x371.webp 1024w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2-300x109.webp 300w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2-768x278.webp 768w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2-1536x556.webp 1536w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2-18x7.webp 18w, https:\/\/www.xintaivalves.com\/wp-content\/uploads\/2025\/06\/China-Industrial-Valve-Manufacturer-xintai-valves-product-2.webp 1550w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>","protected":false},"excerpt":{"rendered":"<p>A bypass gate valve utilizes a smaller secondary pipe connecting the upstream and downstream sides to equalize pressure before the main valve opens, preventing stem damage and reducing the force needed to operate the handwheel.&nbsp; This simple addition transforms a nearly immovable object into a manageable piece of equipment, especially in high-pressure steam or water [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14462,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[238],"tags":[],"class_list":["post-14461","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gate-valve"],"_links":{"self":[{"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/posts\/14461","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/comments?post=14461"}],"version-history":[{"count":2,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/posts\/14461\/revisions"}],"predecessor-version":[{"id":14465,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/posts\/14461\/revisions\/14465"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/media\/14462"}],"wp:attachment":[{"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/media?parent=14461"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/categories?post=14461"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xintaivalves.com\/fr\/wp-json\/wp\/v2\/tags?post=14461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}