{"id":2239,"date":"2024-02-12T13:59:53","date_gmt":"2024-02-12T13:59:53","guid":{"rendered":"https:\/\/www.motointegrator.pt\/blog\/\/?p=2239"},"modified":"2025-11-25T12:03:34","modified_gmt":"2025-11-25T12:03:34","slug":"valvula-de-borboleta-tudo-o-que-deve-saber","status":"publish","type":"post","link":"https:\/\/www.motointegrator.pt\/blog\/valvula-de-borboleta-tudo-o-que-deve-saber\/","title":{"rendered":"A v\u00e1lvula de borboleta: tudo o que deve saber!"},"content":{"rendered":"<p>Montada no carburador, a borboleta de admiss\u00e3o (borboleta de g\u00e1s de admiss\u00e3o) de um motor a gasolina regula o fornecimento de ar fresco. Desta forma, o combust\u00edvel e o ar podem formar uma mistura inflam\u00e1vel com a qual o motor funciona. A v\u00e1lvula de acelera\u00e7\u00e3o regula\/determina a velocidade do motor atrav\u00e9s da rela\u00e7\u00e3o entre o combust\u00edvel e o ar.<\/p>\n<h2>Como funciona a v\u00e1lvula de borboleta?<\/h2>\n<p>Quando a v\u00e1lvula de borboleta est\u00e1 aberta, o ar entra sem obst\u00e1culos na c\u00e2mara de combust\u00e3o. \u00c9 ent\u00e3o aspirado pelos pist\u00f5es atrav\u00e9s das v\u00e1lvulas de admiss\u00e3o. Para al\u00e9m do combust\u00edvel, o oxig\u00e9nio atmosf\u00e9rico tamb\u00e9m \u00e9 importante para o processo de combust\u00e3o. O pr\u00f3prio combust\u00edvel \u00e9 injetado no cilindro. Quando o pist\u00e3o volta a subir, a mistura ar-combust\u00edvel \u00e9 primeiro comprimida e depois inflamada pela <a href=\"\/produtos\/vela-de-ignicao-11005\/\">vela de igni\u00e7\u00e3o.<\/a><\/p>\n<p>A v\u00e1lvula de borboleta controla a quantidade de combust\u00edvel queimado em cada curso do pist\u00e3o e assegura que esta combust\u00e3o \u00e9 efectuada da forma mais eficiente poss\u00edvel. Quando a v\u00e1lvula de acelera\u00e7\u00e3o est\u00e1 fechada, n\u00e3o entra ar e, por conseguinte, n\u00e3o entra oxig\u00e9nio no motor e o processo de combust\u00e3o \u00e9 interrompido. A press\u00e3o no pedal do acelerador controla todas as borboletas de acelera\u00e7\u00e3o, sejam elas el\u00e9ctricas ou electr\u00f3nicas.<\/p>\n<h2>Os diferentes tipos de v\u00e1lvulas de borboleta<\/h2>\n<p>Instalada na conduta de admiss\u00e3o do motor, a borboleta de acelera\u00e7\u00e3o era accionada pelo pedal do acelerador atrav\u00e9s de um cabo nos ve\u00edculos mais antigos. Nos ve\u00edculos mais modernos, existem diferentes formas de acionar uma v\u00e1lvula de acelera\u00e7\u00e3o:<\/p>\n<h3>V\u00e1lvula de borboleta com motor el\u00e9trico<\/h3>\n<p>O cabo do acelerador controla mecanicamente a posi\u00e7\u00e3o das v\u00e1lvulas do acelerador nas v\u00e1lvulas do acelerador com motor el\u00e9trico. Um sinal el\u00e9trico indica a sua posi\u00e7\u00e3o atual na unidade de controlo do motor; o sistema de gest\u00e3o do motor processa a informa\u00e7\u00e3o e compara-a com outros dados dos sensores. Para otimizar o consumo de combust\u00edvel e as emiss\u00f5es de escape, a unidade de controlo do motor monitoriza constantemente a posi\u00e7\u00e3o das v\u00e1lvulas do acelerador e regula a sua posi\u00e7\u00e3o atrav\u00e9s de um servomotor.<\/p>\n<div class=\"product-slider\" style=\"--swiper-theme-color: #d80812;--swiper-navigation-size: 22px;--swiper-navigation-sides-offset: -25px;\"><div class=\"slider-title\"><svg id=\"fi_9219671\" enable-background=\"new 0 0 64 64\" height=\"512\" viewBox=\"0 0 64 64\" width=\"512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><g><g><path d=\"m25.308 61.679c-3.514 0-6.373-2.859-6.373-6.373s2.859-6.372 6.373-6.372 6.373 2.858 6.373 6.372-2.859 6.373-6.373 6.373zm0-8.745c-1.308 0-2.373 1.064-2.373 2.372 0 1.309 1.064 2.373 2.373 2.373s2.373-1.064 2.373-2.373c0-1.308-1.064-2.372-2.373-2.372z\"><\/path><path d=\"m47.462 61.679c-3.514 0-6.372-2.859-6.372-6.373s2.858-6.372 6.372-6.372 6.373 2.858 6.373 6.372-2.86 6.373-6.373 6.373zm0-8.745c-1.308 0-2.372 1.064-2.372 2.372 0 1.309 1.064 2.373 2.372 2.373 1.309 0 2.373-1.064 2.373-2.373 0-1.308-1.065-2.372-2.373-2.372z\"><\/path><\/g><path d=\"m52.128 43.994h-31.419c-3.057 0-5.668-2.081-6.35-5.061l-6.521-28.477c-.086-.376-.346-.698-.696-.86l-5.409-2.507c-1.252-.58-1.797-2.066-1.217-3.319.58-1.252 2.067-1.797 3.319-1.217l5.409 2.507c1.743.807 3.04 2.407 3.468 4.28l6.521 28.479c.158.692.765 1.176 1.476 1.176h31.419c.708 0 1.314-.481 1.476-1.171l5.07-21.813c.145-.62-.119-1.071-.288-1.284-.17-.214-.55-.572-1.186-.572h-37c-1.381 0-2.5-1.119-2.5-2.5s1.119-2.5 2.5-2.5h37c1.999 0 3.857.897 5.101 2.462s1.696 3.579 1.244 5.526l-5.071 21.814c-.691 2.965-3.3 5.037-6.346 5.037z\"><\/path><\/g><\/svg><h2>Vasta sele\u00e7\u00e3o de v\u00e1lvulas borboleta online.<\/h2><\/div><div class=\"swiper\"><div class=\"swiper-wrapper\"><div class=\"swiper-slide product\"><img decoding=\"async\" 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6.373 2.858 6.373 6.372-2.86 6.373-6.373 6.373zm0-8.745c-1.308 0-2.372 1.064-2.372 2.372 0 1.309 1.064 2.373 2.372 2.373 1.309 0 2.373-1.064 2.373-2.373 0-1.308-1.065-2.372-2.373-2.372z\"><\/path><\/g><path d=\"m52.128 43.994h-31.419c-3.057 0-5.668-2.081-6.35-5.061l-6.521-28.477c-.086-.376-.346-.698-.696-.86l-5.409-2.507c-1.252-.58-1.797-2.066-1.217-3.319.58-1.252 2.067-1.797 3.319-1.217l5.409 2.507c1.743.807 3.04 2.407 3.468 4.28l6.521 28.479c.158.692.765 1.176 1.476 1.176h31.419c.708 0 1.314-.481 1.476-1.171l5.07-21.813c.145-.62-.119-1.071-.288-1.284-.17-.214-.55-.572-1.186-.572h-37c-1.381 0-2.5-1.119-2.5-2.5s1.119-2.5 2.5-2.5h37c1.999 0 3.857.897 5.101 2.462s1.696 3.579 1.244 5.526l-5.071 21.814c-.691 2.965-3.3 5.037-6.346 5.037z\"><\/path><\/g><\/svg><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"m8.25 4.5 7.5 7.5-7.5 7.5\" \/><\/svg><\/button><\/div><p class=\"price-info\">Inclui IVA, sem portes de envio<\/p><\/div><\/div><div class=\"swiper-pagination\"><\/div><div class=\"swiper-button-prev\"><\/div><div class=\"swiper-button-next\"><\/div><\/div><\/div>\n<h3>V\u00e1lvula de borboleta eletr\u00f3nica<\/h3>\n<p>Uma v\u00e1lvula de borboleta eletr\u00f3nica deixa de ter uma liga\u00e7\u00e3o mec\u00e2nica ao pedal do acelerador. Se a velocidade do motor for aumentada, o pedal do acelerador eletr\u00f3nico recebe o sinal correspondente e envia-o para o sistema de gest\u00e3o do motor. Este calcula a posi\u00e7\u00e3o ideal da v\u00e1lvula de borboleta e controla-a com a ajuda de um servomotor.<\/p>\n<h2>V\u00e1lvulas de borboleta em motores diesel<\/h2>\n<p>Na maioria dos casos, os motores diesel mais antigos n\u00e3o t\u00eam v\u00e1lvulas de borboleta, com uma exce\u00e7\u00e3o: trata-se do motor de igni\u00e7\u00e3o por compress\u00e3o com pr\u00e9-c\u00e2mara da Mercedes.<\/p>\n<figure id=\"attachment_16044\" aria-describedby=\"caption-attachment-16044\" style=\"width: 300px\" class=\"wp-caption alignleft\"><img decoding=\"async\" class=\"wp-image-16044 size-medium\" src=\"https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2024\/02\/valvula-de-borboleta2-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2024\/02\/valvula-de-borboleta2-300x225.jpg 300w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2024\/02\/valvula-de-borboleta2-80x60.jpg 80w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2024\/02\/valvula-de-borboleta2-265x198.jpg 265w, https:\/\/www.motointegrator.pt\/blog\/wp-content\/uploads\/sites\/17\/2024\/02\/valvula-de-borboleta2.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-16044\" class=\"wp-caption-text\">\u00a9 Cristian C. Adrian \/ Shutterstock<\/figcaption><\/figure>\n<p>No entanto, neste caso, a posi\u00e7\u00e3o da v\u00e1lvula de borboleta n\u00e3o regula a quantidade de ar aspirado, mas sim a quantidade de gas\u00f3leo injetado pela bomba de gas\u00f3leo. Ao mesmo tempo, a v\u00e1lvula de borboleta regula o v\u00e1cuo para o sistema de fecho centralizado. Num motor a gas\u00f3leo, a mistura \u00e9 preparada de acordo com um princ\u00edpio diferente e, por isso, n\u00e3o necessita de uma v\u00e1lvula de estrangulamento. Embora as v\u00e1lvulas sejam novamente utilizadas nos novos motores diesel com inje\u00e7\u00e3o direta, n\u00e3o t\u00eam qualquer influ\u00eancia na prepara\u00e7\u00e3o da mistura combust\u00edvel-ar. Destinam-se apenas a evitar que o motor trema quando \u00e9 desligado.<\/p>\n<h2>V\u00e1lvulas de borboleta na F\u00f3rmula 1<\/h2>\n<p>Na F\u00f3rmula 1, as v\u00e1lvulas de borboleta s\u00e3o componentes indispens\u00e1veis que podem fazer a diferen\u00e7a entre a vit\u00f3ria e a derrota. Durante mais de vinte anos, foram instalados tr\u00eas tipos diferentes de v\u00e1lvulas de acelera\u00e7\u00e3o: A v\u00e1lvula de guilhotina corta abruptamente o fornecimento de ar. S\u00f3 quando \u00e9 novamente aberta \u00e9 que o ar entra na c\u00e2mara de combust\u00e3o. A v\u00e1lvula de borboleta, tamb\u00e9m conhecida por borboleta, est\u00e1 ligada a um eixo rotativo. Se o condutor acelerar a fundo, o ar entra na c\u00e2mara de combust\u00e3o sem qualquer impedimento, uma vez que a <a href=\"\/produtos\/valvulas-de-admissao-1070213\/\">v\u00e1lvula de borboleta<\/a> est\u00e1 na posi\u00e7\u00e3o vertical. Na posi\u00e7\u00e3o horizontal, fecha completamente o fornecimento de ar. Como a v\u00e1lvula de borboleta se assemelha ao bater de asas destes animais, foi-lhe dado o seu nome marcante.<\/p>\n<p>Como terceira op\u00e7\u00e3o, s\u00e3o instaladas as chamadas v\u00e1lvulas de barril nestes motores de alta qualidade. Trata-se de esferas que podem fechar o caminho do ar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Montada no carburador, a borboleta de admiss\u00e3o (borboleta de g\u00e1s de admiss\u00e3o) de um motor a gasolina regula o fornecimento de ar fresco. Desta forma, o combust\u00edvel e o ar podem formar uma mistura inflam\u00e1vel com a qual o motor funciona. A v\u00e1lvula de acelera\u00e7\u00e3o regula\/determina a velocidade do motor atrav\u00e9s da rela\u00e7\u00e3o entre o [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":16043,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3294,641,450],"tags":[3695,3693,3692,3694,3696],"class_list":["post-2239","post","type-post","status-publish","format-standard","has-post-thumbnail","category-automovel","category-carrossel","category-valvula-de-borboleta","tag-funcao-da-valvula-de-borboleta","tag-tipos-de-valvula-de-borboleta","tag-valvula-de-borboleta","tag-valvula-de-borboleta-diesel","tag-valvula-de-borboleta-eletronica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A v\u00e1lvula de borboleta: tudo o que deve saber!<\/title>\n<meta name=\"description\" content=\"A v\u00e1lvula de borboleta utiliza a rela\u00e7\u00e3o entre o combust\u00edvel e o ar para regular a velocidade do motor. 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