{"id":4438,"date":"2026-03-19T03:48:04","date_gmt":"2026-03-19T03:48:04","guid":{"rendered":"https:\/\/hydrathpower.com\/?p=4438"},"modified":"2026-03-19T03:48:04","modified_gmt":"2026-03-19T03:48:04","slug":"vannes-de-derivation-hydrauliques-types-utilisations-guide-de-dimensionnement","status":"publish","type":"post","link":"https:\/\/hydrathpower.com\/fr\/hydraulic-bypass-valves-types-uses-sizing-guide\/","title":{"rendered":"Explication des vannes de d\u00e9rivation hydrauliques : Types, utilisations et guide de dimensionnement"},"content":{"rendered":"<section id=\"what-is\">\n<h3>Qu'est-ce qu'une soupape de d\u00e9rivation ?<\/h3>\n<p>Une vanne de d\u00e9rivation fournit une voie d'\u00e9coulement alternative dans un syst\u00e8me hydraulique afin que le circuit puisse continuer \u00e0 fonctionner lorsque la voie principale est restreinte, surpress\u00e9e ou isol\u00e9e pour des raisons de maintenance. Elle stabilise la pression, prot\u00e8ge les composants et peut prendre en charge les circuits de refroidissement.<\/p>\n<\/section>\n<section id=\"core-functions\">\n<h3>Fonctions essentielles en hydraulique<\/h3>\n<ul>\n<li>R\u00e9gulation de la pression : redirige le fluide lorsque la pression d\u00e9passe les limites de s\u00e9curit\u00e9<\/li>\n<li>Contr\u00f4le du d\u00e9bit : maintenir des d\u00e9bits constants en d\u00e9tournant les fluides exc\u00e9dentaires ou redirig\u00e9s.<\/li>\n<li>Protection des composants : prot\u00e9ger les pompes, les filtres et les actionneurs contre les pointes de tension ou les blocages.<\/li>\n<li>Support de refroidissement : acheminer les fluides dans les circuits de refroidissement pour r\u00e9duire le risque de surchauffe.<\/li>\n<li>Flexibilit\u00e9 de la maintenance : isoler des sections sans arr\u00eater l'ensemble du syst\u00e8me<\/li>\n<\/ul>\n<p><em>Conseil :<\/em> Si une vanne de d\u00e9rivation se d\u00e9clenche fr\u00e9quemment en fonctionnement normal, v\u00e9rifiez si les filtres sont obstru\u00e9s, si les r\u00e9glages de pression sont incorrects ou si les composants sont sous-dimensionn\u00e9s.<\/p>\n<\/section>\n<section id=\"types\">\n<h3>Types de vannes de d\u00e9rivation<\/h3>\n<ul>\n<li>Soupapes de s\u00fbret\u00e9 (s'ouvrent \u00e0 une pression pr\u00e9d\u00e9finie, retournent souvent dans le r\u00e9servoir)<\/li>\n<li><a href=\"\/cartridge-solenoid-valve\/\">Sol\u00e9no\u00efde<\/a>-Vannes \u00e0 commande manuelle (contr\u00f4le automatis\u00e9)<\/li>\n<li>Vannes manuelles (\u00e0 levier ou \u00e0 bouton)<\/li>\n<li>Valves \u00e0 ressort (r\u00e9ponse automatique \u00e0 la pression)<\/li>\n<li>Vannes \u00e0 flotteur (ouverture\/fermeture en fonction du niveau)<\/li>\n<li><a href=\"\/hydraulic-check-valve\/\">Clapets anti-retour<\/a> (emp\u00eachent le retour d'eau tout en permettant la d\u00e9rivation vers l'avant)<\/li>\n<li>Vannes variables (d\u00e9bits de d\u00e9rivation r\u00e9glables)<\/li>\n<li>R\u00e9gulateurs de d\u00e9bit avec by-pass (r\u00e9gulation int\u00e9gr\u00e9e + by-pass)<\/li>\n<\/ul>\n<\/section>\n<section id=\"sizing\">\n<h3>Comment dimensionner et sp\u00e9cifier une vanne de d\u00e9rivation (4 \u00e9tapes)<\/h3>\n<ol>\n<li>Comprendre l'application : type de fluide\/viscosit\u00e9, plage de temp\u00e9rature, compatibilit\u00e9, cycle de travail, environnement<\/li>\n<li>Calculer les besoins en d\u00e9bit : d\u00e9bit maximal du syst\u00e8me (LPM\/GPM) et capacit\u00e9 de d\u00e9rivation requise<\/li>\n<li>Confirmer les valeurs nominales de pression : s'assurer que la soupape d\u00e9passe la pression maximale du syst\u00e8me et tenir compte de la perte de charge attendue.<\/li>\n<li>S\u00e9lectionner le type de vanne : manuelle, sol\u00e9no\u00efde ou \u00e0 commande par pression, en fonction des besoins en mati\u00e8re d'automatisation et de circuit.<\/li>\n<\/ol>\n<\/section>\n<section id=\"bypass-vs-relief\">\n<h3>Clapets de d\u00e9rivation et clapets de d\u00e9charge<\/h3>\n<ul>\n<li>Vannes de d\u00e9rivation : redirigent le flux autour d'un composant pour en maintenir le fonctionnement.<\/li>\n<li>Clapets de d\u00e9charge : ils s'ouvrent \u00e0 une pression d\u00e9termin\u00e9e pour prot\u00e9ger le syst\u00e8me, en acheminant g\u00e9n\u00e9ralement le flux vers le r\u00e9servoir.\n<p><figure id=\"attachment_4442\" aria-describedby=\"caption-attachment-4442\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve-300x200.jpg\" class=\"size-medium wp-image-4442 lazyload\" alt=\"soupape de d\u00e9charge ou soupape de d\u00e9rivation\" width=\"300\" height=\"200\"><figcaption id=\"caption-attachment-4442\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-medium wp-image-4442\" src=\"https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve-300x200.jpg\" alt=\"soupape de d\u00e9charge ou soupape de d\u00e9rivation\" width=\"300\" height=\"200\" srcset=\"https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve-300x200.jpg 300w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve-1024x683.jpg 1024w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve-768x512.jpg 768w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve-18x12.jpg 18w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/relief-valve-vs-bypass-valve.jpg 1200w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/noscript> Soupape de d\u00e9charge et soupape de d\u00e9rivation<\/figcaption><\/figure><\/li>\n<\/ul>\n<p>Conclusion : Utiliser la d\u00e9rivation pour permettre aux syst\u00e8mes de fonctionner en contournant les restrictions ; utiliser la d\u00e9charge pour \u00e9viter les surpressions en d\u00e9versant l'eau dans le r\u00e9servoir.<\/p>\n<\/section>\n<section id=\"signs\">\n<h3>Signes de dysfonctionnement de la soupape de d\u00e9rivation<\/h3>\n<ul>\n<li>Fluctuations inhabituelles de la pression<\/li>\n<li>Surchauffe<\/li>\n<li>D\u00e9bit r\u00e9duit<\/li>\n<li>Fuites de fluide<\/li>\n<li>Fonctionnement bruyant<\/li>\n<li>R\u00e9ponse incoh\u00e9rente de l'actionneur<\/li>\n<li>Soupape coinc\u00e9e<\/li>\n<\/ul>\n<\/section>\n<section id=\"troubleshooting\">\n<h3>Liste de contr\u00f4le pour le d\u00e9pannage<\/h3>\n<ul>\n<li>V\u00e9rifier les r\u00e9glages de pression et l'orientation des vannes<\/li>\n<li>Inspecter les filtres ; remplacer les \u00e9l\u00e9ments colmat\u00e9s (attention aux conceptions de d\u00e9rivation de la t\u00eate ou de l'\u00e9l\u00e9ment).<\/li>\n<li>V\u00e9rifier la contamination et l'int\u00e9grit\u00e9 du joint<\/li>\n<li>Confirmer les voies de refroidissement et le niveau du r\u00e9servoir<\/li>\n<li>Test des signaux de commande des sol\u00e9no\u00efdes et de l'actionnement manuel<\/li>\n<li>Mesurer la chute de pression dans la vanne au d\u00e9bit de travail<\/li>\n<\/ul>\n<\/section>\n<section id=\"faq\">\n<h3>FAQ<\/h3>\n<p><strong>O\u00f9 se trouve la d\u00e9rivation du filtre ?<\/strong><br \/>\nSelon le mod\u00e8le, la d\u00e9rivation peut se faire au niveau de l'\u00e9l\u00e9ment ou de la t\u00eate ; faire correspondre les remplacements au m\u00eame mod\u00e8le.<\/p>\n<p><strong>Quand ai-je besoin d'une soupape de d\u00e9rivation thermique ?<\/strong><br \/>\nUtilisez le by-pass thermique pour g\u00e9rer la viscosit\u00e9 au d\u00e9marrage \u00e0 froid ou pour faire passer l'huile dans les refroidisseurs lorsque la temp\u00e9rature augmente.<br \/>\n<img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve-300x200.jpg\" class=\"alignnone size-medium wp-image-4441 lazyload\" alt=\"soupape de d\u00e9rivation thermique\" width=\"300\" height=\"200\"><noscript><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4441\" src=\"https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve-300x200.jpg\" alt=\"soupape de d\u00e9rivation thermique\" width=\"300\" height=\"200\" srcset=\"https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve-300x200.jpg 300w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve-1024x683.jpg 1024w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve-768x512.jpg 768w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve-18x12.jpg 18w, https:\/\/hydrathpower.com\/wp-content\/uploads\/2026\/03\/thermal-bypass-valve.jpg 1200w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/noscript><\/p>\n<p><strong>Les soupapes de d\u00e9rivation peuvent-elles remplacer les soupapes de s\u00fbret\u00e9 ?<\/strong><br \/>\nNon. Ils ont des r\u00f4les diff\u00e9rents. La d\u00e9charge prot\u00e8ge contre les surpressions, souvent vers le r\u00e9servoir ; la d\u00e9rivation maintient le fonctionnement en contournant les composants.<\/p>\n<p><strong>Comment emp\u00eacher l'activation fr\u00e9quente du by-pass ?<\/strong><br \/>\nV\u00e9rifier l'\u00e9tat des filtres, r\u00e9gler correctement les pressions et s'assurer que les composants sont dimensionn\u00e9s pour le d\u00e9bit et la pression de pointe.<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>What is a bypass valve? A bypass valve provides an alternative flow path in a hydraulic system so the circuit [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4440,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4438","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hydraulic Bypass Valves Explained: Types, Uses, and Sizing Guide - Hydrath Power<\/title>\n<meta name=\"description\" content=\"Learn how bypass valves work, when to use them, key types, sizing steps, relief vs bypass differences, and common malfunction symptoms.\" \/>\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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