{"id":1299,"date":"2012-12-07T11:56:59","date_gmt":"2012-12-07T11:56:59","guid":{"rendered":"https:\/\/fgti-distribution.fr\/?page_id=1299"},"modified":"2023-07-05T12:11:56","modified_gmt":"2023-07-05T12:11:56","slug":"generalidades","status":"publish","type":"page","link":"https:\/\/fgti-distribution.fr\/pt\/joints-detancheite\/generalites\/","title":{"rendered":"Fun\u00e7\u00e3o de uma junta comp\u00f3sita"},"content":{"rendered":"
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FGTI-Distribui\u00e7\u00e3o > Juntas de veda\u00e7\u00e3o > Fun\u00e7\u00e3o de uma junta comp\u00f3sita<\/div>\n

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\nFun\u00e7\u00e3o de uma junta comp\u00f3sita\n<\/td>\n<\/a>\n<\/td>\n<\/tr>\n\n
\nPrinc\u00edpio de constru\u00e7\u00e3o\n<\/td>\n\nAs juntas compostas s\u00e3o constitu\u00eddas, normalmente, por dois elementos.
\nO anel de veda\u00e7\u00e3o \u00e9 usinado em PTFE carregado, particularmente resistente ao desgaste. Gra\u00e7as \u00e0s qualidades deste material, as juntas podem suportar press\u00e3o, velocidade e resistir a varia\u00e7\u00f5es de temperatura importantes.
\n\n<\/td>\n		\nNa medida em que os valores m\u00e1ximos s\u00f3 s\u00e3o atingidos pela adi\u00e7\u00e3o de diferentes par\u00e2metros, s\u00e3o necess\u00e1rios testes preliminares em certas aplica\u00e7\u00f5es extremas.
\nUm elemento de pr\u00e9-tens\u00e3o el\u00e1stica fornece a press\u00e3o necess\u00e1ria para garantir a estanqueidade entre a superf\u00edcie de atrito e a superf\u00edcie oposta, assegurando assim a longevidade da estanqueidade. A pr\u00e9-tens\u00e3o \u00e9 aplicada por um anel de borracha O-ring ou uma mola em a\u00e7o perfilado. Os an\u00e9is O-ring tamb\u00e9m asseguram a estanqueidade est\u00e1tica no fundo da ranhura.
\nPara a escolha dos materiais do anel de veda\u00e7\u00e3o e do elemento de pr\u00e9-tens\u00e3o, devem considerar-se as condi\u00e7\u00f5es de utiliza\u00e7\u00e3o.\n<\/td>\n<\/tr>\n\n
\nImpermeabiliza\u00e7\u00e3o interior\nou exterior\n<\/td>\n\nTodas as juntas que garantem a estanquidade radial podem ser concebidas para assegurar uma estanquidade interior ou exterior.
\nEstanquidade exterior, por exemplo, junta de pist\u00e3o MANOY\u00ae perfil 112\n<\/td>\n		\n\nImpermeabiliza\u00e7\u00e3o interior, por exemplo, junta de haste MANOY\u00ae perfil 120\n<\/td>\n<\/tr>\n\n
\nFuncionamento da\nimpermeabiliza\u00e7\u00e3o<\/td>\n\nAs juntas comp\u00f3sitas e juntas de l\u00e1bio MANOY s\u00e3o ativadas pela press\u00e3o do fluido. Atrav\u00e9s da elasticidade da sua sec\u00e7\u00e3o no fundo de garganta, o anel de veda\u00e7\u00e3o garante a estanquidade est\u00e1tica no fundo de garganta e empurra a junta de veda\u00e7\u00e3o din\u00e2mica para a superf\u00edcie oposta.\n<\/td>\n\n\nA press\u00e3o do fluido exerce uma pr\u00e9-tens\u00e3o adicional na junta do pist\u00e3o.\nAssim, a press\u00e3o necess\u00e1ria para garantir a veda\u00e7\u00e3o \u00e9 equilibrada pela press\u00e3o fornecida pelo fluido.\nAt\u00e9 aproximadamente 2MPa, a for\u00e7a de veda\u00e7\u00e3o \u00e9 obtida quase unicamente gra\u00e7as \u00e0 for\u00e7a do elemento de pr\u00e9-tens\u00e3o. \n<\/td>\n<\/tr>\n\n
\nEscolha do perfil<\/td>\n\n\n<\/td>\n\nA escolha do perfil do anel de veda\u00e7\u00e3o depende essencialmente do movimento, da dire\u00e7\u00e3o e do valor da press\u00e3o, assim como da qualidade do fluido.\n<\/td>\n<\/tr>\n\n
\nPr\u00e9-aperto do O-ring<\/td>\n\nDe modo a garantir uma boa estanquidade, os alojamentos s\u00e3o posicionados de forma a que seja exercida uma pr\u00e9-tens\u00e3o m\u00e9dia pela junta t\u00f3rica ou pela mola.
\nUma profundidade de garganta inferior garante uma maior pr\u00e9-tens\u00e3o e melhora assim a estanquidade em caso de press\u00f5es baixas (at\u00e9 cerca de 2 MPa) ou inexistentes.\nUma profundidade de garganta mais consequente permite uma certa flexibilidade de funcionamento que ser\u00e1, no entanto, em detrimento da estanquidade.\n<\/td>\n		\n\n<\/td>\n<\/tr>\n\n\n
\nValor do conjunto de funcionamento<\/td>\n\nO valor m\u00ednimo exigido de folga depende da precis\u00e3o do guiamento e dos outros par\u00e2metros de montagem. Assim, \u00e9 necess\u00e1rio considerar eventuais aumentos de press\u00e3o e de dilata\u00e7\u00e3o ao calor.
\nDo lado oposto \u00e0 press\u00e3o, devem privilegiar-se flux baixos, enquanto do lado da press\u00e3o, um fluxo elevado permite evitar o ac\u00famulo de part\u00edculas.
\nPara press\u00f5es superiores a 40 MPA, \u00e9 imperativo o cumprimento de valores de toler\u00e2ncias H8\/f8 para os di\u00e2metros de furo\/pist\u00e3o e camisas\/hastes.\n<\/td>\n		\n\n<\/td>\n<\/tr>\n\n
\nImpermeabiliza\u00e7\u00e3o<\/td>\n\nUma junta s\u00f3 \u00e9 perfeitamente estanque quando est\u00e1 est\u00e1tica. Em movimento, a estanquidade \u00e9 mais dif\u00edcil. Uma opera\u00e7\u00e3o totalmente a seco levaria ao desgaste de todos os elementos de estanquidade. Em estanquidade din\u00e2mica, uma lubrifica\u00e7\u00e3o ligeira pelo fluido na superf\u00edcie oposta assegurar\u00e1 um bom funcionamento da junta.\n<\/td>\n\n \n<\/td>\n<\/tr>\n\n<\/tbody><\/table>\n\n
\nTopo da p\u00e1gina<\/a>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":8,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1299","page","type-page","status-publish","hentry"],"yoast_head":"\nFGTI Distribution - Fonction d'un joint d'\u00e9tanch\u00e9it\u00e9 composite<\/title>\n<meta name=\"description\" content=\"Fiche produit IDG par FGTI distribution : fonction d'un joint d'\u00e9tanch\u00e9it\u00e9 composite\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fgti-distribution.fr\/pt\/juntas-de-estanquidade\/generalidades\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FGTI Distribution - 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