{"id":5102,"date":"2024-08-27T09:34:53","date_gmt":"2024-08-27T01:34:53","guid":{"rendered":"https:\/\/cylinderheadmfg.com\/?p=5102"},"modified":"2024-08-27T09:34:56","modified_gmt":"2024-08-27T01:34:56","slug":"what-is-an-engine-valve","status":"publish","type":"post","link":"https:\/\/cylinderheadmfg.com\/pt\/what-is-an-engine-valve\/","title":{"rendered":"O que \u00e9 uma v\u00e1lvula de motor? Tipos e fun\u00e7\u00f5es explicados"},"content":{"rendered":"<p class=\"wp-block-paragraph\">O<a href=\"https:\/\/cylinderheadmfg.com\/pt\/engine-valves-manufacturer\/\"> v\u00e1lvulas do motor <\/a>s\u00e3o pe\u00e7as muito importantes do motor de combust\u00e3o interna. S\u00e3o respons\u00e1veis por permitir a entrada das misturas ar-combust\u00edvel na c\u00e2mara de combust\u00e3o e a sa\u00edda dos gases de escape. T\u00eam um mecanismo mec\u00e2nico, o que significa que abrem e fecham em alturas espec\u00edficas para manter o motor a funcionar no seu melhor. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tipos de v\u00e1lvulas no motor<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Type-of-engine-valve.png\" alt=\"Tipo de v\u00e1lvula do motor\" class=\"wp-image-5105 lazyload\" style=\"width:800px\"><noscript><img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Type-of-engine-valve.png\" alt=\"Tipo de v\u00e1lvula do motor\" class=\"wp-image-5105\" style=\"width:800px\" srcset=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Type-of-engine-valve.png 600w, https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Type-of-engine-valve-300x200.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/noscript><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. V\u00e1lvula de gatilho<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\n  As v\u00e1lvulas de gatilho t\u00eam uma forma \u00fanica de cogumelo, pelo que s\u00e3o conhecidas como v\u00e1lvulas de cogumelo. Encontram-se em motores de autom\u00f3veis e s\u00e3o compostas por uma cabe\u00e7a e uma haste, sendo que a cabe\u00e7a veda contra a sede da v\u00e1lvula para controlar o fluxo de g\u00e1s. O \u00e2ngulo da face da v\u00e1lvula \u00e9 normalmente esmerilado entre 30\u00b0 e 45\u00b0 para garantir um fecho muito apertado. As v\u00e1lvulas de gatilho s\u00e3o controladas pela \u00e1rvore de cames que, durante o funcionamento da came, abre e fecha a admiss\u00e3o. O processo permite que as misturas ar-combust\u00edvel entrem no espa\u00e7o de armazenamento durante o curso de admiss\u00e3o e, mais tarde, durante o curso de escape, para a exaust\u00e3o dos gases.\n<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. V\u00e1lvula de manga<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\n  As v\u00e1lvulas de manga s\u00e3o estruturas semelhantes a tubos que se encaixam entre o pist\u00e3o e a parede do cilindro. Deslizam ou rodam para alinhar os lados com as portas de entrada e de sa\u00edda do cilindro, regulando assim o fluxo de ar. Esta constru\u00e7\u00e3o permite-lhe funcionar de forma mais silenciosa do que as que utilizam pe\u00e7as m\u00f3veis, como os balancins e os tuchos.&nbsp;\n<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. V\u00e1lvula rotativa<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As v\u00e1lvulas rotativas baseiam-se num disco rotativo que possui orif\u00edcios. Quando o disco gira, liga-se alternadamente aos tubos de admiss\u00e3o e de escape, o que permite um fluxo suave dos gases. Estas v\u00e1lvulas s\u00e3o principalmente utilizadas em motores de alta velocidade devido \u00e0 sua conce\u00e7\u00e3o simples e ao baixo n\u00edvel de tens\u00e3o e vibra\u00e7\u00e3o durante o funcionamento.\u00a0 <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. V\u00e1lvula de palheta<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\n  As v\u00e1lvulas de palheta s\u00e3o feitas de tiras flex\u00edveis de metal que desempenham a fun\u00e7\u00e3o de v\u00e1lvulas de reten\u00e7\u00e3o. Estas tiras, quando pressionadas pela mistura ar-combust\u00edvel que entra, permitem primeiro que esta entre nas necessidades do motor e, ao mesmo tempo, impedem a sa\u00edda dos gases de escape. As v\u00e1lvulas de palheta encontram-se normalmente nos motores a dois tempos e s\u00e3o preferidas devido \u00e0 sua capacidade de regular a rela\u00e7\u00e3o ar-combust\u00edvel\n<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Como \u00e9 que as v\u00e1lvulas funcionam num motor?<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/How-Do-Valves-Work-In-An-Engine.png\" alt=\"Como funcionam as v\u00e1lvulas num motor\" class=\"wp-image-5106 lazyload\" style=\"width:800px\"><noscript><img decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/How-Do-Valves-Work-In-An-Engine.png\" alt=\"Como funcionam as v\u00e1lvulas num motor\" class=\"wp-image-5106\" style=\"width:800px\" srcset=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/How-Do-Valves-Work-In-An-Engine.png 600w, https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/How-Do-Valves-Work-In-An-Engine-300x200.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\n  O funcionamento das v\u00e1lvulas do motor \u00e9 uma dan\u00e7a cuidadosamente coreografada, sincronizada com os pist\u00f5es do motor. Aqui est\u00e1 um resumo simplificado:\n<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>O <a href=\"https:\/\/cylinderheadmfg.com\/pt\/custom-camshaft-manufacturer\/\">\u00e1rvore de cames<\/a>, que est\u00e1 sincronizado com a cambota, roda.<br><\/li>\n\n\n\n<li>Os l\u00f3bulos da \u00e1rvore de cames empurram contra componentes como elevadores, hastes e balancins.<br><\/li>\n\n\n\n<li>Este movimento provoca a abertura e o fecho das v\u00e1lvulas em momentos precisos.<br><\/li>\n\n\n\n<li>\u00c0 medida que o pist\u00e3o desce, cria um v\u00e1cuo que aspira a mistura ar-combust\u00edvel atrav\u00e9s da v\u00e1lvula de admiss\u00e3o aberta.<br><\/li>\n\n\n\n<li>A v\u00e1lvula de admiss\u00e3o fecha-se e o pist\u00e3o comprime a mistura.<br><\/li>\n\n\n\n<li>Ap\u00f3s a combust\u00e3o, a v\u00e1lvula de escape abre-se para deixar sair os gases residuais.<br><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\n  \u00c9 como um ballet bem ensaiado, mas com mais \u00f3leo e menos tutus.\n<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Compreender a fun\u00e7\u00e3o das v\u00e1lvulas do motor<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Function-of-engine-valve.png\" alt=\"Fun\u00e7\u00e3o da v\u00e1lvula do motor\" class=\"wp-image-5107 lazyload\" style=\"width:800px\"><noscript><img decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Function-of-engine-valve.png\" alt=\"Fun\u00e7\u00e3o da v\u00e1lvula do motor\" class=\"wp-image-5107\" style=\"width:800px\" srcset=\"https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Function-of-engine-valve.png 600w, https:\/\/cylinderheadmfg.com\/wp-content\/uploads\/2024\/08\/Function-of-engine-valve-300x200.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\n  As v\u00e1lvulas do motor n\u00e3o s\u00e3o apenas pe\u00e7as met\u00e1licas sofisticadas. S\u00e3o pe\u00e7as multifuncionais:\n<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Regular a entrada de ar e de combust\u00edvel<br>  <\/li>\n\n\n\n<li>Expuls\u00e3o dos gases de escape<br>  <\/li>\n\n\n\n<li>Manter a press\u00e3o na c\u00e2mara de combust\u00e3o<br>  <\/li>\n\n\n\n<li>Ajuda a arrefecer o motor<br>  <\/li>\n\n\n\n<li>Reduzir o ru\u00eddo<br>  <\/li>\n\n\n\n<li>Evitar o refluxo de gases<br>  <\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Em suma, s\u00e3o os \"seguran\u00e7as\" do seu motor, controlando o que entra e sai.\n<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Conclus\u00e3o<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\n  As v\u00e1lvulas do motor podem n\u00e3o ser as estrelas glamorosas do mundo autom\u00f3vel, mas s\u00e3o certamente os ajudantes de palco trabalhadores que mant\u00eam o espet\u00e1culo a funcionar sem problemas. Ao regularem o fluxo de gases, asseguram que o seu motor proporciona a m\u00e1xima pot\u00eancia, uma \u00f3ptima economia de combust\u00edvel e emiss\u00f5es reduzidas.\n<\/p>","protected":false},"excerpt":{"rendered":"<p>The engine valves are very important parts of the internal combustion engine. Responsible for allowing the air-fuel mixtures into the combustion chamber and the exhaust gases to leave. They have a mechanical mechanism, which means that they open and close at specific times in order to keep the engine working at its best. Types of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5104,"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":"","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":[157],"tags":[],"class_list":["post-5102","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engine-components"],"_links":{"self":[{"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/posts\/5102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/comments?post=5102"}],"version-history":[{"count":0,"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/posts\/5102\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/media\/5104"}],"wp:attachment":[{"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/media?parent=5102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/categories?post=5102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cylinderheadmfg.com\/pt\/wp-json\/wp\/v2\/tags?post=5102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}