{"id":14280,"date":"2024-11-12T12:00:51","date_gmt":"2024-11-12T12:00:51","guid":{"rendered":"https:\/\/hydraflu.com\/?p=14280"},"modified":"2024-11-12T12:00:51","modified_gmt":"2024-11-12T12:00:51","slug":"bleed-air-from-closed-loop-hydraulic-systems","status":"publish","type":"post","link":"https:\/\/hydraflu.com\/fr\/purger-lair-des-systemes-hydrauliques-en-circuit-ferme\/","title":{"rendered":"Pourquoi et comment purger l'air des syst\u00e8mes hydrauliques en circuit ferm\u00e9"},"content":{"rendered":"

<\/h1>\n

The trapped air in your hydraulic system is like an uninvited guest who just won’t leave on their own unless pushed away. Though it may look harmless, it can seriously mess with your system’s efficiency, cost you extra maintenance time, and ultimately cause major headaches. As you proceed to read, you will learn how to bleed air from it.<\/span><\/p>\n

Pourquoi l'air emprisonn\u00e9 dans un syst\u00e8me hydraulique en circuit ferm\u00e9 constitue un probl\u00e8me<\/b><\/h2>\n

L'air emprisonn\u00e9 a des effets sur le fonctionnement de syst\u00e8me hydraulique<\/a> Avec fluidit\u00e9 et pr\u00e9cision, elle agit comme une \u00e9ponge sur les fluides hydrauliques, engendrant des mouvements saccad\u00e9s et impr\u00e9visibles. Ainsi, m\u00eame de faibles vibrations peuvent d\u00e9stabiliser le syst\u00e8me. Cette instabilit\u00e9 entra\u00eene une perte de pr\u00e9cision et un gaspillage d'\u00e9nergie consid\u00e9rable, r\u00e9duisant d'autant le rendement.<\/span><\/p>\n

Formation de cavit\u00e9s due \u00e0 des bulles emprisonn\u00e9es<\/b><\/h3>\n

Un autre probl\u00e8me est la formation de cavit\u00e9s. Lorsque des bulles d'air se forment et implosent sous la pression du fonctionnement, elles cr\u00e9ent des cavit\u00e9s. M\u00eame si cela peut para\u00eetre anodin (et \u00e7a l'est), ce ph\u00e9nom\u00e8ne peut endommager vos pompes et vos vannes, corrodant ainsi les composants con\u00e7us pour assurer le bon fonctionnement de votre syst\u00e8me hydraulique.<\/span><\/p>\n

Dommages \u00e0 long terme au syst\u00e8me hydraulique<\/b><\/h3>\n

Si vous n\u00e9gligez l'air emprisonn\u00e9 pendant une p\u00e9riode prolong\u00e9e, comme c'est souvent le cas, cela entra\u00eenera une usure pr\u00e9matur\u00e9e du syst\u00e8me. On ne s'en aper\u00e7oit g\u00e9n\u00e9ralement qu'\u00e0 la fin, car l'air emprisonn\u00e9 passe souvent inaper\u00e7u, par n\u00e9gligence ou par paresse.<\/span><\/p>\n

The hydraulic fluid exists to ensure a smooth distribution of temperature. But, when the bubbles are formed and implode, it doesn\u2019t let the system stay in thermal balance. Only if you’re unlucky, the wear and tear might lead to cracked valve seats or worn pump components.<\/span><\/p>\n

Signes et sympt\u00f4mes de la pr\u00e9sence d'air emprisonn\u00e9 dans les conduites hydrauliques<\/b><\/h2>\n

The question that arises here is why this trapped air goes unnoticed. Let’s find the signs and symptoms and then you will be guided to bleed the air out of the system.<\/span><\/p>\n

Comment identifier l'air dans un circuit hydraulique<\/b><\/h3>\n

En effet, la pr\u00e9sence d'air dans un syst\u00e8me hydraulique ne se manifeste pas toujours de fa\u00e7on \u00e9vidente. Cependant, on peut la d\u00e9tecter en sachant quoi chercher. Les sympt\u00f4mes classiques incluent une sensation spongieuse au niveau des commandes hydrauliques, une vitesse irr\u00e9guli\u00e8re et, bien s\u00fbr, des bruits anormaux.<\/span><\/p>\n

Vous pouvez tendre l'oreille pour d\u00e9celer des bruits de cognement, de sifflement ou tout autre son ressemblant \u00e0 ce type de bruit.<\/span><\/p>\n

Probl\u00e8mes de performance courants li\u00e9s \u00e0 la pr\u00e9sence d'air<\/b><\/h3>\n

Les probl\u00e8mes de performance dus \u00e0 la pr\u00e9sence d'air emprisonn\u00e9 peuvent aller de mouvements saccad\u00e9s et irr\u00e9guliers \u00e0 une incapacit\u00e9 totale \u00e0 monter en pression. Un autre signe de la pr\u00e9sence d'air emprisonn\u00e9 est le mouvement des actionneurs. Si ces derniers fonctionnent par \u00e0-coups, trop lentement ou s'ils cale, la pr\u00e9sence d'air dans le circuit hydraulique est \u00e0 prendre en compte.<\/span><\/p>\n

Comprendre les syst\u00e8mes hydrauliques en boucle ferm\u00e9e<\/b><\/h3>\n

Avant de proc\u00e9der \u00e0 la purge d'air du syst\u00e8me, il est important de comprendre le fonctionnement d'un syst\u00e8me hydraulique en circuit ferm\u00e9. Contrairement aux syst\u00e8mes en circuit ouvert, les circuits ferm\u00e9s recyclent le fluide hydraulique vers la pompe au lieu de l'envoyer vers un r\u00e9servoir.<\/span><\/p>\n

Ce syst\u00e8me est donc tr\u00e8s performant, mais aussi vuln\u00e9rable \u00e0 l'air emprisonn\u00e9, car le circuit du fluide est ferm\u00e9. L'air a peu de chances de s'\u00e9chapper naturellement, d'o\u00f9 l'importance d'une purge d'air ad\u00e9quate.<\/span><\/p>\n

Outils n\u00e9cessaires pour purger l'air d'un syst\u00e8me hydraulique<\/b><\/h2>\n

Purger l'air d'un syst\u00e8me hydraulique ne n\u00e9cessite pas un outillage encombrant. <\/span>Vous n'aurez besoin que de quelques outils, tels que\u00a0:<\/span><\/p>\n

    \n
  1. \u00a0 \u00a0 \u00a0 <\/span>Cl\u00e9s pour desserrer les vis de purge.<\/span><\/li>\n
  2. \u00a0 \u00a0 \u00a0 <\/span>Un manom\u00e8tre pour surveiller la pression du syst\u00e8me pendant la purge.<\/span><\/li>\n
  3. \u00a0 \u00a0 \u00a0 <\/span>Purgez les soupapes pour laisser l'air s'\u00e9chapper.<\/span><\/li>\n
  4. \u00a0 \u00a0 \u00a0 <\/span>Un \u00e9quipement de protection (visi\u00e8re de s\u00e9curit\u00e9, lunettes de s\u00e9curit\u00e9, combinaison de s\u00e9curit\u00e9) pour vous prot\u00e9ger des projections de fluide hydraulique sous pression.<\/span><\/li>\n<\/ol>\n

    Assurez-vous simplement que tous les outils sont con\u00e7us pour un usage hydraulique, car les pressions en jeu peuvent \u00eatre suffisamment importantes pour \u00eatre atteintes par des outils anciens.<\/span><\/p>\n

    Guide \u00e9tape par \u00e9tape pour purger l'air d'un syst\u00e8me hydraulique en circuit ferm\u00e9<\/b><\/h3>\n

    Pr\u00e9paration du syst\u00e8me \u00e0 la purge d'air \u2013 Arr\u00eat du syst\u00e8me<\/b><\/h4>\n

    Si le syst\u00e8me est op\u00e9rationnel, comme c'est g\u00e9n\u00e9ralement le cas, commencez par l'arr\u00eater et le laisser refroidir. Les fluides hydrauliques atteignent des temp\u00e9ratures \u00e9lev\u00e9es. Ensuite, assurez-vous que la zone est d\u00e9gag\u00e9e. Mettez vos lunettes de s\u00e9curit\u00e9 et poursuivons.<\/span><\/p>\n

    \u00c9tapes pour purger manuellement l'air du syst\u00e8me<\/b><\/h4>\n
      \n
    1. \u00a0 \u00a0 \u00a0 <\/span>La premi\u00e8re et principale \u00e9tape consiste \u00e0 localiser le <\/span>Valve de purge<\/b>. On le trouve g\u00e9n\u00e9ralement pr\u00e8s des points hauts du syst\u00e8me afin que l'air puisse \u00eatre \u00e9vacu\u00e9 naturellement.<\/span><\/li>\n
    2. \u00a0 \u00a0 \u00a0 <\/span>Vous pouvez alors ouvrir la vanne, mais lentement. La pression risque de repousser le fluide avec l'air. Il est imp\u00e9ratif d'\u00e9viter toute fuite d'air du r\u00e9servoir d'huile hydraulique.<\/span><\/li>\n
    3. \u00a0 \u00a0 \u00a0 <\/span>Il est tr\u00e8s important de surveiller le processus, que l'air s'\u00e9chappe ou non. Il faut \u00eatre attentif \u00e0 la pr\u00e9sence de mousse dans le liquide, signe d'une fuite d'air.<\/span><\/li>\n
    4. \u00a0 \u00a0 \u00a0 <\/span>Une fois que vous estimez que la majeure partie de l'air est \u00e9vacu\u00e9e, vous pouvez actionner les actionneurs pour pousser les bulles restantes vers le point de purge.<\/span><\/li>\n
    5. \u00a0 \u00a0 \u00a0 <\/span>Une fois que vous constatez un \u00e9coulement r\u00e9gulier de liquide, vous pouvez fermer la vanne de purge.<\/span><\/li>\n<\/ol>\n

      V\u00e9rification de l'\u00e9limination r\u00e9ussie de l'air<\/b><\/h4>\n

      Apr\u00e8s avoir suivi les \u00e9tapes pr\u00e9c\u00e9dentes et v\u00e9rifi\u00e9 que l'air emprisonn\u00e9 a bien \u00e9t\u00e9 purg\u00e9, faites fonctionner le syst\u00e8me \u00e0 faible vitesse. Si le mouvement est fluide, c'est r\u00e9ussi. En cas d'\u00e0-coups, recommencez la proc\u00e9dure.<\/span><\/p>\n

      Pr\u00e9cautions de s\u00e9curit\u00e9 lors de la purge d'air des syst\u00e8mes hydrauliques<\/b><\/h3>\n

      Purger un syst\u00e8me hydraulique ne revient pas \u00e0 d\u00e9samorcer une bombe, mais les risques sont bien r\u00e9els. La haute pression du fluide peut provoquer des blessures en cas de fuite soudaine. C'est pourquoi il est indispensable de porter des gants et des lunettes de protection. De plus, assurez-vous que toutes les vannes sont bien serr\u00e9es avant de remettre le syst\u00e8me sous pression.<\/span><\/p>\n

      Probl\u00e8mes courants et conseils de d\u00e9pannage<\/b><\/h3>\n
        \n
      1. \u00a0 \u00a0 \u00a0 <\/span>L'un des probl\u00e8mes les plus fr\u00e9quents est que l'air refuse parfois de s'\u00e9vacuer. Dans ce cas, essayez d'incliner l\u00e9g\u00e8rement l'actionneur ou de tapoter doucement les conduites pour faciliter la circulation de l'air vers les points de purge.<\/span><\/li>\n
      2. \u00a0 \u00a0 \u00a0 <\/span>Une fois l'air purg\u00e9 du syst\u00e8me, assurez-vous que tous les raccords sont bien \u00e9tanches. Un raccord mal serr\u00e9 risque de laisser entrer de l'air. Serrez donc tout correctement pour \u00e9viter que cela ne se reproduise.<\/span><\/li>\n<\/ol>\n

        Maintenance pr\u00e9ventive pour \u00e9viter la pr\u00e9sence d'air dans les syst\u00e8mes hydrauliques<\/b><\/h3>\n

        Il est tout aussi vrai, en mati\u00e8re d'entretien, que la pr\u00e9vention est toujours pr\u00e9f\u00e9rable \u00e0 la r\u00e9paration. Pour ce faire, inspectez r\u00e9guli\u00e8rement les tuyaux, les raccords et les joints du syst\u00e8me. Si n\u00e9cessaire, remplacez rapidement les pi\u00e8ces us\u00e9es. Veillez \u00e9galement \u00e0 ce que tous les \u00e9l\u00e9ments soient bien serr\u00e9s. Cela minimisera les risques de retour d'air dans le syst\u00e8me.<\/span><\/p>\n

        Conclusion : Meilleures pratiques pour maintenir un syst\u00e8me hydraulique sans air<\/b><\/h3>\n

        Maintenir un syst\u00e8me hydraulique en circuit ferm\u00e9 exempt d'air exige une vigilance constante. Des contr\u00f4les r\u00e9guliers et un entretien appropri\u00e9 vous \u00e9viteront bien des probl\u00e8mes. N'oubliez jamais que la purge d'air est essentielle au bon fonctionnement de votre syst\u00e8me. Alors, n'attendez pas que la situation se d\u00e9grade et agissez rapidement\u00a0: cela fera toute la diff\u00e9rence.<\/span><\/p>","protected":false},"excerpt":{"rendered":"

        The trapped air in your hydraulic system is like an uninvited guest who just won’t leave on their own unless pushed away. 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