{"id":21684,"date":"2025-03-13T14:16:53","date_gmt":"2025-03-13T06:16:53","guid":{"rendered":"https:\/\/ifanplus.com\/?p=21684"},"modified":"2025-03-13T14:16:55","modified_gmt":"2025-03-13T06:16:55","slug":"resistance-a-la-corrosion-des-vannes-deau-en-pvc","status":"publish","type":"post","link":"https:\/\/ifanplus.com\/fr\/connaissance\/resistance-a-la-corrosion-des-vannes-deau-en-pvc\/","title":{"rendered":"R\u00e9sistance \u00e0 la corrosion des vannes d&#039;eau en PVC"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Le PVC (polychlorure de vinyle) est l&#039;un des mat\u00e9riaux les plus utilis\u00e9s dans la fabrication de vannes d&#039;eau. Ces vannes assurent un contr\u00f4le fiable du d\u00e9bit d&#039;eau dans divers syst\u00e8mes. <a href=\"https:\/\/ifanplus.com\/fr\/product-category\/industrie-du-pvc\/\">vannes en PVC<\/a> Les vannes en PVC offrent de nombreux avantages par rapport aux mat\u00e9riaux traditionnels comme les m\u00e9taux, notamment en termes de r\u00e9sistance \u00e0 la corrosion. Cette r\u00e9sistance est l&#039;une des principales raisons de la forte demande pour les vannes d&#039;eau en PVC, tant pour les applications r\u00e9sidentielles qu&#039;industrielles. Cet article explore la r\u00e9sistance \u00e0 la corrosion des vannes d&#039;eau en PVC, leurs avantages et leur importance pour les r\u00e9seaux d&#039;eau.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-1-introduction-to-pvc-water-valves\">1. Introduction aux vannes d&#039;eau en PVC<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Les vannes d&#039;eau sont des composants essentiels pour contr\u00f4ler le d\u00e9bit d&#039;eau dans les canalisations. Elles r\u00e9gulent le d\u00e9bit, la pression et la direction de l&#039;eau dans un syst\u00e8me. Les vannes d&#039;eau en PVC, fabriqu\u00e9es en chlorure de polyvinyle, offrent une excellente r\u00e9sistance \u00e0 la corrosion par rapport aux vannes m\u00e9talliques. Le PVC ne rouille pas, ne se corrode pas et ne se d\u00e9grade pas au contact de l&#039;eau, contrairement aux m\u00e9taux, qui peuvent r\u00e9agir \u00e0 l&#039;humidit\u00e9 et aux produits chimiques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette r\u00e9sistance \u00e0 la corrosion rend les vannes en PVC id\u00e9ales pour les r\u00e9seaux d&#039;eau potable et d&#039;assainissement. Elles peuvent r\u00e9sister \u00e0 une exposition prolong\u00e9e \u00e0 l&#039;eau sans se d\u00e9t\u00e9riorer. De plus, elles ne sont pas affect\u00e9es par les sels, les acides et les produits chimiques souvent pr\u00e9sents dans les r\u00e9seaux d&#039;eau.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-2-corrosion-resistance-in-pvc-material\">2. R\u00e9sistance \u00e0 la corrosion du PVC<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La corrosion se produit lorsqu&#039;un mat\u00e9riau r\u00e9agit avec son environnement, entra\u00eenant sa d\u00e9gradation. Les m\u00e9taux comme le fer, l&#039;acier et le cuivre se corrodent souvent lorsqu&#039;ils sont expos\u00e9s \u00e0 l&#039;eau, \u00e0 l&#039;oxyg\u00e8ne et \u00e0 d&#039;autres \u00e9l\u00e9ments. La rouille et d&#039;autres formes de corrosion affaiblissent la structure et la fonctionnalit\u00e9 de la vanne, entra\u00eenant fuites et d\u00e9faillances.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le PVC, quant \u00e0 lui, est tr\u00e8s r\u00e9sistant \u00e0 la corrosion. Il ne r\u00e9agit pas avec l&#039;eau, les acides ni les sels. Cette propri\u00e9t\u00e9 explique en partie son utilisation si r\u00e9pandue dans les r\u00e9seaux d&#039;eau. Sa structure chimique cr\u00e9e une barri\u00e8re qui pr\u00e9vient la corrosion, garantissant ainsi le bon fonctionnement de la vanne pendant une longue p\u00e9riode.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-3-benefits-of-corrosion-resistance-in-pvc-water-valves\">3. Avantages de la r\u00e9sistance \u00e0 la corrosion des vannes d&#039;eau en PVC<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9sistance \u00e0 la corrosion des vannes d&#039;eau en PVC offre plusieurs avantages significatifs. Ces avantages contribuent \u00e0 la performance et \u00e0 la durabilit\u00e9 \u00e0 long terme des syst\u00e8mes d&#039;eau.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Long\u00e9vit\u00e9 accrue<\/strong>Les vannes d&#039;eau en PVC durent beaucoup plus longtemps que les vannes m\u00e9talliques. L&#039;absence de corrosion signifie qu&#039;elles ne se d\u00e9gradent pas avec le temps. Par cons\u00e9quent, les vannes en PVC ont une dur\u00e9e de vie plus longue, r\u00e9duisant ainsi la n\u00e9cessit\u00e9 de les remplacer fr\u00e9quemment.<\/li>\n\n\n\n<li><strong>Fiabilit\u00e9 am\u00e9lior\u00e9e<\/strong>La corrosion peut entra\u00eener un dysfonctionnement des vannes m\u00e9talliques, entra\u00eenant des fuites, des blocages ou une panne totale. Les vannes en PVC conservent leur int\u00e9grit\u00e9 structurelle et continuent de fonctionner efficacement. Cette fiabilit\u00e9 est particuli\u00e8rement cruciale dans les applications n\u00e9cessitant un d\u00e9bit d&#039;eau ininterrompu.<\/li>\n\n\n\n<li><strong>Co\u00fbts de maintenance r\u00e9duits<\/strong>Gr\u00e2ce \u00e0 leur r\u00e9sistance \u00e0 la corrosion, les vannes en PVC n\u00e9cessitent moins d&#039;entretien. Les vannes m\u00e9talliques n\u00e9cessitent souvent un nettoyage ou un remplacement en raison de la rouille et de la corrosion. En revanche, les vannes en PVC n\u00e9cessitent un entretien minimal, ce qui contribue \u00e0 r\u00e9duire les co\u00fbts de maintenance au fil du temps.<\/li>\n\n\n\n<li><strong>S\u00e9curit\u00e9<\/strong>La corrosion des vannes m\u00e9talliques peut entra\u00eener des fuites et une contamination de l&#039;alimentation en eau. Les vannes en PVC \u00e9liminent ce risque, garantissant une eau propre et non contamin\u00e9e dans le syst\u00e8me.<\/li>\n\n\n\n<li><strong>Avantages environnementaux<\/strong>La corrosion entra\u00eene souvent la lib\u00e9ration de m\u00e9taux nocifs dans l&#039;eau. Les vannes en PVC, r\u00e9sistantes \u00e0 la corrosion, emp\u00eachent l&#039;introduction de substances toxiques dans l&#039;eau. Cela garantit une eau plus s\u00fbre et plus propre, tant pour la consommation humaine que pour l&#039;industrie.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-4-the-role-of-pvc-in-corrosion-resistance\">4. Le r\u00f4le du PVC dans la r\u00e9sistance \u00e0 la corrosion<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9sistance du PVC \u00e0 la corrosion r\u00e9sulte de ses propri\u00e9t\u00e9s uniques. Le PVC est un polym\u00e8re plastique synth\u00e9tique dot\u00e9 d&#039;une structure solide et durable. Sa composition mol\u00e9culaire ne permet pas la m\u00eame d\u00e9gradation que celle subie par les m\u00e9taux expos\u00e9s \u00e0 l&#039;humidit\u00e9, \u00e0 l&#039;air ou aux produits chimiques.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inertie chimique<\/strong>Le PVC est chimiquement inerte, ce qui signifie qu&#039;il ne r\u00e9agit pas avec les substances avec lesquelles il entre en contact. Cette caract\u00e9ristique contribue \u00e0 pr\u00e9venir la rouille et la corrosion, m\u00eame en cas d&#039;exposition \u00e0 l&#039;eau contenant divers produits chimiques ou contaminants.<\/li>\n\n\n\n<li><strong>Surface lisse<\/strong>La surface du PVC est lisse et non poreuse, ce qui emp\u00eache la salet\u00e9, les min\u00e9raux et les bact\u00e9ries d&#039;y adh\u00e9rer. Cette douceur contribue \u00e9galement \u00e0 pr\u00e9venir l&#039;accumulation de substances corrosives, contrairement aux surfaces m\u00e9talliques, qui peuvent emprisonner la salet\u00e9 et favoriser la corrosion.<\/li>\n\n\n\n<li><strong>Non absorbant<\/strong>Le PVC n&#039;absorbe pas l&#039;humidit\u00e9, facteur cl\u00e9 de corrosion. Le mat\u00e9riau reste sec \u00e0 l&#039;int\u00e9rieur, emp\u00eachant la formation de rouille. Les valves m\u00e9talliques, en revanche, peuvent absorber l&#039;humidit\u00e9, ce qui acc\u00e9l\u00e8re le processus de corrosion.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-5-how-pvc-water-valves-perform-in-various-environments\">5. Comment fonctionnent les vannes d&#039;eau en PVC dans divers environnements<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Les vannes d&#039;eau en PVC excellent dans divers environnements gr\u00e2ce \u00e0 leur r\u00e9sistance \u00e0 la corrosion. Ce mat\u00e9riau est performant en eau douce comme en eau sal\u00e9e, ce qui le rend polyvalent pour de nombreuses applications.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Syst\u00e8mes d&#039;eau douce<\/strong>Dans les syst\u00e8mes d&#039;eau douce, les vannes en PVC conservent leur int\u00e9grit\u00e9, m\u00eame expos\u00e9es \u00e0 un d\u00e9bit d&#039;eau continu. Contrairement aux vannes m\u00e9talliques, le PVC ne rouille pas et ne se d\u00e9grade pas dans ces conditions, garantissant ainsi la fonctionnalit\u00e9 du syst\u00e8me au fil du temps.<\/li>\n\n\n\n<li><strong>Environnements marins et d&#039;eau sal\u00e9e<\/strong>L&#039;eau sal\u00e9e est particuli\u00e8rement corrosive pour les m\u00e9taux. De nombreux m\u00e9taux, dont l&#039;acier, le fer et le cuivre, se corrodent rapidement au contact de l&#039;eau sal\u00e9e. Les vannes en PVC, quant \u00e0 elles, ne sont pas affect\u00e9es par la pr\u00e9sence de sel. Elles constituent donc un excellent choix pour les r\u00e9seaux d&#039;eau de mer et c\u00f4tiers.<\/li>\n\n\n\n<li><strong>Syst\u00e8mes de traitement des eaux us\u00e9es<\/strong>Les syst\u00e8mes d&#039;assainissement sont souvent expos\u00e9s \u00e0 des produits chimiques agressifs, des acides et des sels. Les vannes en PVC r\u00e9sistent \u00e0 ces conditions difficiles sans se corroder. Le PVC est donc id\u00e9al pour le traitement des eaux us\u00e9es, le traitement des eaux industrielles et les syst\u00e8mes de manipulation de produits chimiques.<\/li>\n\n\n\n<li><strong>Zones \u00e0 forte humidit\u00e9<\/strong>Dans les environnements tr\u00e8s humides, les vannes m\u00e9talliques sont sujettes \u00e0 la rouille et \u00e0 la corrosion. La r\u00e9sistance du PVC \u00e0 l&#039;humidit\u00e9 pr\u00e9vient la corrosion, ce qui en fait un choix id\u00e9al pour les r\u00e9gions \u00e0 forte humidit\u00e9.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-6-comparison-with-other-valve-materials\">6. Comparaison avec d&#039;autres mat\u00e9riaux de valve<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Bien que les vannes en PVC offrent une r\u00e9sistance exceptionnelle \u00e0 la corrosion, il est utile de comparer leurs performances avec d\u2019autres mat\u00e9riaux.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Valves m\u00e9talliques<\/strong>Les vannes m\u00e9talliques, comme celles en laiton, en acier ou en fer, sont plus sensibles \u00e0 la corrosion. La pr\u00e9sence d&#039;eau, d&#039;oxyg\u00e8ne et de produits chimiques provoque la rouille et la d\u00e9gradation des vannes m\u00e9talliques au fil du temps. Par cons\u00e9quent, ces vannes n\u00e9cessitent un entretien et des remplacements plus fr\u00e9quents.<\/li>\n\n\n\n<li><strong>Vannes en acier inoxydable<\/strong>Les vannes en acier inoxydable offrent une meilleure r\u00e9sistance \u00e0 la corrosion que les autres m\u00e9taux, mais elles rouillent n\u00e9anmoins avec le temps, surtout dans des conditions difficiles. Le PVC, en revanche, surpasse l&#039;acier inoxydable dans de nombreux environnements, notamment en pr\u00e9sence d&#039;une forte acidit\u00e9 ou de sel.<\/li>\n\n\n\n<li><strong>Vannes en laiton<\/strong>Les vannes en laiton sont souvent utilis\u00e9es dans les syst\u00e8mes de plomberie, mais elles sont vuln\u00e9rables \u00e0 la corrosion lorsqu&#039;elles sont expos\u00e9es \u00e0 l&#039;eau au fil du temps. Le PVC, en revanche, est plus durable et plus \u00e9conomique \u00e0 long terme.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-7-applications-of-pvc-water-valves\">7. Applications des vannes d&#039;eau en PVC<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9sistance \u00e0 la corrosion des vannes d&#039;eau en PVC les rend id\u00e9ales pour de nombreuses applications, notamment :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Plomberie<\/strong>Les vannes en PVC sont couramment utilis\u00e9es dans les syst\u00e8mes de plomberie r\u00e9sidentiels et commerciaux. Elles garantissent un d\u00e9bit d&#039;eau propre et s\u00fbr et sont faciles \u00e0 installer.<\/li>\n\n\n\n<li><strong>Irrigation<\/strong>Les vannes en PVC r\u00e9gulent le d\u00e9bit d&#039;eau dans les syst\u00e8mes d&#039;irrigation agricole. Leur r\u00e9sistance \u00e0 la corrosion garantit une performance durable en ext\u00e9rieur.<\/li>\n\n\n\n<li><strong>Traitement des eaux us\u00e9es<\/strong>Les vannes en PVC sont essentielles dans les stations d&#039;\u00e9puration. Elles r\u00e9sistent aux produits chimiques agressifs et aux eaux us\u00e9es sans se corroder, garantissant ainsi des performances fiables.<\/li>\n\n\n\n<li><strong>Utilisation industrielle<\/strong>:De nombreux proc\u00e9d\u00e9s industriels impliquent une exposition \u00e0 des produits chimiques corrosifs. Les vannes en PVC sont utilis\u00e9es dans les industries de transformation chimique, p\u00e9trochimique et pharmaceutique en raison de leur r\u00e9sistance \u00e0 la corrosion.<\/li>\n\n\n\n<li><strong>Syst\u00e8mes marins<\/strong>Les vannes en PVC sont largement utilis\u00e9es dans les syst\u00e8mes marins, tels que les bateaux et les navires. La r\u00e9sistance \u00e0 la corrosion du PVC le rend id\u00e9al pour une exposition \u00e0 l&#039;eau de mer.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-8-conclusion\">8. Conclusion<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9sistance \u00e0 la corrosion des vannes d&#039;eau en PVC en fait un choix id\u00e9al pour les r\u00e9seaux d&#039;eau. Elles surpassent les vannes m\u00e9talliques dans de nombreux environnements, offrant une long\u00e9vit\u00e9, une fiabilit\u00e9 et une s\u00e9curit\u00e9 accrues. Les vannes en PVC constituent une solution \u00e9conomique n\u00e9cessitant un entretien minimal, ce qui les rend id\u00e9ales pour les applications r\u00e9sidentielles, industrielles et municipales. Leur inertie chimique, leur surface lisse et leur durabilit\u00e9 garantissent un d\u00e9bit d&#039;eau ininterrompu pendant de nombreuses ann\u00e9es. L&#039;utilisation croissante des vannes d&#039;eau en PVC dans divers secteurs t\u00e9moigne de leurs immenses avantages, notamment pour la pr\u00e9vention des probl\u00e8mes li\u00e9s \u00e0 la corrosion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-ifan-international-standard\">Norme internationale IFAN<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Les produits en PEHD d&#039;IFAN sont conformes \u00e0 diverses normes internationales, garantissant qualit\u00e9, durabilit\u00e9 et fiabilit\u00e9. Parmi ces normes figurent les normes ASTM D3035 et ASTM D3350, qui d\u00e9finissent les sp\u00e9cifications des tubes et mat\u00e9riaux en poly\u00e9thyl\u00e8ne (PE). Les normes ISO 4427 et EN 12201 \u00e9tablissent des r\u00e9f\u00e9rences mondiales pour les tubes en PE utilis\u00e9s dans les r\u00e9seaux d&#039;approvisionnement en eau. De plus, les normes DIN 8074\/8075 et GB\/T 13663 \u00e9tablissent les exigences de performance et de dimension des tubes en PEHD sur les march\u00e9s europ\u00e9en et chinois. D&#039;autres normes reconnues, telles que AS\/NZS 4130 (Australie\/Nouvelle-Z\u00e9lande), JIS K6760 (Japon), BS 6572 (Royaume-Uni) et CSA B137.1 (Canada), t\u00e9moignent de l&#039;engagement d&#039;IFAN \u00e0 respecter les r\u00e9glementations industrielles mondiales.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-contact\">Contact<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IFAN est un fabricant professionnel fort de 30 ans d&#039;exp\u00e9rience, sp\u00e9cialis\u00e9 dans la production de tuyaux, raccords et vannes en plastique de haute qualit\u00e9. Nos produits comprennent des vannes en laiton, des vannes en PPR, ainsi que divers tuyaux et raccords pour r\u00e9pondre aux diff\u00e9rents besoins de nos clients. Que vous ayez besoin de tuyaux de plomberie et d&#039;\u00e9vacuation ou de vannes, IFAN propose une gamme diversifi\u00e9e de produits de haute qualit\u00e9 et \u00e9conomiques pour vos projets. Vous trouverez nos coordonn\u00e9es ci-dessous.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nous r\u00e9pondrons \u00e0 votre e-mail ou fax dans les 24 heures.<br>Vous pouvez nous appeler \u00e0 tout moment si vous avez des questions sur notre production.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour plus d&#039;informations, veuillez visiter notre site Web&nbsp;<a href=\"https:\/\/ifanplus.com\/fr\">https:\/\/www.ifanplus.com\/<\/a><br>Veuillez envoyer un mail \u00e0 :&nbsp;<a href=\"mailto:jack@ifangroup.com\">jack@ifangroup.com<\/a><br><a href=\"https:\/\/api.whatsapp.com\/send?phone=https:\/\/api.whatsapp.com\/send?l=en&amp;phone=8619857948982\">WhatsApp : + 86 19857948982<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>PVC (Polyvinyl Chloride) is one of the most widely used materials in the production of water valves. These valves provide reliable control of water flow in various systems. PVC valves offer many advantages over traditional materials like metals, especially when it comes to corrosion resistance. Corrosion resistance is one of the primary reasons why PVC [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21685,"comment_status":"closed","ping_status":"closed","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":"","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":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[276,233,603,310,607],"class_list":["post-21684","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-ball-valve","tag-pvc","tag-pvc-water-valves","tag-valves","tag-water-valves"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v27.7) - 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