{"id":2703,"count":2,"description":"\r\n\r\n\r\n\r\nOBTER INFORMA\u00c7\u00d5ES DO DIAGRAMA DA V\u00c1LVULA DO DIAFRAGMA<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n

O que \u00e9 uma v\u00e1lvula de diafragma?<\/h2>\r\n\r\n\r\n\r\n\r\nAs v\u00e1lvulas de diafragma recebem o nome de um disco flex\u00edvel que entra em contato com uma sede na parte superior do corpo da v\u00e1lvula para formar uma veda\u00e7\u00e3o. Um diafragma \u00e9 um elemento flex\u00edvel e sens\u00edvel \u00e0 press\u00e3o que transmite for\u00e7a para abrir, fechar ou controlar uma v\u00e1lvula. As v\u00e1lvulas de diafragma est\u00e3o relacionadas \u00e0s v\u00e1lvulas de mangote, mas usam um diafragma elastom\u00e9rico, em vez de um revestimento elastom\u00e9rico no corpo da v\u00e1lvula, para separar o fluxo do elemento de fechamento.\r\n\r\n\r\n\r\n\r\n
\"\"<\/figure>\r\n\r\n\r\n\r\n

Como funcionam as v\u00e1lvulas de diafragma?<\/h2>\r\n\r\n\r\n\r\n\r\nAs v\u00e1lvulas de diafragma s\u00e3o simples em constru\u00e7\u00e3o e opera\u00e7\u00e3o. Um atuador de v\u00e1lvula est\u00e1 em contato com a membrana interna (ou \u201cdiafragma\u201d) da v\u00e1lvula em sua posi\u00e7\u00e3o aberta. Quando o usu\u00e1rio deseja que a v\u00e1lvula seja fechada, o atuador \u00e9 pressionado e\/ou girado e a membrana \u00e9 empurrada para dentro da borda da estrutura s\u00f3lida, fechando a v\u00e1lvula. Certas v\u00e1lvulas de diafragma tamb\u00e9m podem ter posi\u00e7\u00f5es semiabertas\/restritas onde a membrana est\u00e1 parcialmente fechada, permitindo um fluxo estrangulado atrav\u00e9s da v\u00e1lvula. Na pr\u00f3xima se\u00e7\u00e3o, examinaremos as amplas categorias de v\u00e1lvulas de diafragma e onde elas s\u00e3o mais \u00fateis.\r\n\r\n\r\n\r\n\r\n

Tipos de v\u00e1lvulas de diafragma<\/h2>\r\n\r\n\r\n\r\n

V\u00e1lvulas de diafragma tipo Weir<\/h3>\r\n\r\n\r\n\r\n\r\nA v\u00e1lvula de diafragma tipo vertedor \u00e9 um dos designs mais comuns dispon\u00edveis e \u00e9 mostrada na Figura 2 acima. O design de l\u00e1bio\/sela elevado \u00e9 mais adequado para controle de fluxo pequeno e \u00e9 mantido \u00e0 prova de vazamentos gra\u00e7as \u00e0 tampa sobre o diafragma e o atuador. Este projeto \u00e9 ideal para l\u00edquidos e gases perigosos ou corrosivos, pois qualquer falha na membrana ser\u00e1 mantida contida por esta tampa. Al\u00e9m disso, o corpo inclinado torna esta v\u00e1lvula inerentemente autodrenante, mas esta drenagem pode ocorrer em ambas as dire\u00e7\u00f5es da v\u00e1lvula, o que pode n\u00e3o ser ideal para algumas aplica\u00e7\u00f5es. A v\u00e1lvula tipo vertedor \u00e9 especificada principalmente para fluidos limpos e homog\u00eaneos, pois lamas viscosas e sedimentos podem se acumular em ambos os lados da sela. Eles s\u00e3o encontrados com mais frequ\u00eancia em processos como aplica\u00e7\u00f5es aliment\u00edcias\/qu\u00edmicas, de produ\u00e7\u00e3o de g\u00e1s, corrosivas e de \u00e1gua.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvulas de diafragma tipo direto<\/h3>\r\n\r\n\r\n\r\n\r\nA v\u00e1lvula de diafragma direta \u00e9 estruturalmente semelhante aos tipos de a\u00e7ude; no entanto, n\u00e3o cont\u00e9m a sela caracter\u00edstica e, em vez disso, possui um caminho completamente reto. Suas membranas s\u00e3o normalmente mais flex\u00edveis e permitem uma dist\u00e2ncia maior de deslocamento, pois devem tocar a parte inferior da v\u00e1lvula. Essas v\u00e1lvulas devem frequentemente passar por manuten\u00e7\u00e3o\/substitu\u00eddas, pois sua vida \u00fatil \u00e9 normalmente menor do que os projetos do tipo barragem devido \u00e0s suas membranas mais flex\u00edveis. As v\u00e1lvulas de diafragma direto s\u00e3o usadas para polpas, fluidos viscosos e outras aplica\u00e7\u00f5es onde o bloqueio deve ser reduzido. Eles tamb\u00e9m s\u00e3o \u00fateis para regimes de fluxo bidirecionais, pois n\u00e3o h\u00e1 sela para impedir a mudan\u00e7a r\u00e1pida da entrada para a sa\u00edda.\r\n\r\n\r\n\r\n\r\n

Pe\u00e7as da v\u00e1lvula de diafragma<\/h2>\r\n\r\n\r\n\r\n\r\nOs componentes das v\u00e1lvulas de diafragma s\u00e3o os seguintes:\r\n\r\n\r\n\r\n\r\n

Tampa da v\u00e1lvula de diafragma<\/h3>\r\n\r\n\r\n\r\n\r\nO castelo serve como tampa superior e \u00e9 aparafusado ao corpo da v\u00e1lvula. Ele protege o compressor, a haste, o diafragma e outros componentes n\u00e3o molhados da v\u00e1lvula de diafragma.\r\n\r\n\r\n\r\n\r\n

Corpo da v\u00e1lvula de diafragma<\/h3>\r\n\r\n\r\n\r\n\r\nO corpo da v\u00e1lvula \u00e9 o componente diretamente conectado \u00e0 tubula\u00e7\u00e3o por onde passa o fluido. A \u00e1rea de fluxo dentro do corpo da v\u00e1lvula depende do tipo de v\u00e1lvula de diafragma.\r\n\r\n\r\n\r\n\r\n\r\nTanto o corpo da v\u00e1lvula quanto o castelo s\u00e3o constru\u00eddos com materiais fortes, r\u00edgidos e resistentes \u00e0 corros\u00e3o.\r\n\r\n\r\n\r\n\r\n

Diafragma da v\u00e1lvula de diafragma<\/h3>\r\n\r\n\r\n\r\n\r\nO diafragma \u00e9 feito de um disco polim\u00e9rico altamente el\u00e1stico que se move para baixo at\u00e9 tocar a parte inferior do corpo da v\u00e1lvula para limitar ou obstruir a passagem do fluido. O diafragma levanta se a taxa de fluxo do fluido for aumentada ou se a v\u00e1lvula for totalmente aberta. O fluido flui por baixo do diafragma. No entanto, este componente limita a temperatura e a press\u00e3o de funcionamento da v\u00e1lvula devido ao material e \u00e0 estrutura do diafragma. Tamb\u00e9m deve ser substitu\u00eddo periodicamente, pois suas propriedades mec\u00e2nicas se degradam durante o uso.\r\n\r\n\r\n\r\n\r\n\r\nO diafragma isola os componentes n\u00e3o molhados (compressor, haste e atuador) do fluido que flui. Portanto, \u00e9 menos prov\u00e1vel que s\u00f3lidos e fluidos viscosos interfiram no mecanismo operacional da v\u00e1lvula de diafragma. Isto tamb\u00e9m protege os componentes n\u00e3o molhados da corros\u00e3o. Por outro lado, o fluido na tubula\u00e7\u00e3o n\u00e3o ser\u00e1 contaminado com o lubrificante utilizado na opera\u00e7\u00e3o da v\u00e1lvula.\r\n\r\n\r\n\r\n\r\n

Material do diafragma da v\u00e1lvula de diafragma<\/h4>\r\n\r\n\r\n\r\n\r\nTipo sem forro ou forro de borracha<\/strong>\r\n\r\n\r\n\r\n\r\n
    \r\n \t
  • NR\/Borracha Natural<\/li>\r\n \t
  • NBR\/Nitrila\/Buna-N<\/li>\r\n \t
  • EPDM<\/li>\r\n \t
  • FKM\/Viton<\/li>\r\n \t
  • BUNA-N<\/li>\r\n \t
  • SI\/borracha de silicone<\/li>\r\n \t
  • Couro<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\nTipo de pl\u00e1stico com fl\u00faor<\/strong>\r\n\r\n\r\n\r\n\r\n
      \r\n \t
    • FEP, com apoio EPDM<\/li>\r\n \t
    • PTFE, com suporte de EPDM<\/li>\r\n \t
    • PFA, com suporte de EPDM<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n

      Compressor de v\u00e1lvula de diafragma<\/h3>\r\n\r\n\r\n\r\n\r\nO compressor \u00e9 um disco que fica entre a haste da v\u00e1lvula e o diafragma. Ele suporta a v\u00e1lvula diafragma e distribui as for\u00e7as da haste durante o movimento linear. O design do compressor \u00e9 otimizado para fornecer melhor estrangulamento e controle do fluxo.\r\n\r\n\r\n\r\n\r\n

      Haste da v\u00e1lvula de diafragma<\/h3>\r\n\r\n\r\n\r\n\r\nA haste \u00e9 um eixo vertical conectado ao compressor que exerce movimento linear para mover o compressor e o diafragma, operando assim a v\u00e1lvula de diafragma. Ele transmite o movimento exercido pelo atuador. As v\u00e1lvulas de diafragma podem ter hastes do tipo pist\u00e3o ou roscadas. Como o nome indica, as v\u00e1lvulas do tipo pist\u00e3o s\u00e3o movidas por um conjunto de pist\u00e3o dentro do castelo, com a haste da v\u00e1lvula provavelmente atuando como a haste do pist\u00e3o. Este tipo requer for\u00e7a linear exercida pela press\u00e3o do fluido. As v\u00e1lvulas de haste roscada possuem uma porca de haste correspondente. Este tipo requer torque para mover linearmente a haste, bem como lubrifica\u00e7\u00e3o para um movimento suave.\r\n\r\n\r\n\r\n\r\n\r\nAs hastes roscadas das v\u00e1lvulas de diafragma podem ter um mecanismo ascendente ou n\u00e3o ascendente:\r\n\r\n\r\n\r\n\r\n
        \r\n \t
      • Haste Ascendente<\/strong>: Hastes ascendentes ou hastes indicadoras estendem-se at\u00e9 o volante. \u00c0 medida que o volante \u00e9 girado, a haste sobe ou desce para abrir ou fechar a v\u00e1lvula, respectivamente. Conseq\u00fcentemente, \u00e9 mais f\u00e1cil determinar at\u00e9 que ponto a v\u00e1lvula \u00e9 aberta observando a quantidade de haste exposta. No entanto, as hastes ascendentes ocupam mais espa\u00e7o do que as hastes n\u00e3o ascendentes.<\/li>\r\n \t
      • Haste N\u00e3o Ascendente:<\/strong> Hastes n\u00e3o ascendentes ou hastes n\u00e3o indicativas s\u00e3o giradas para abrir ou fechar a v\u00e1lvula, mas isso n\u00e3o faz com que a haste se mova para cima ou para baixo. As v\u00e1lvulas de haste n\u00e3o ascendente s\u00e3o usadas em espa\u00e7os limitados, como em sistemas de tubula\u00e7\u00e3o subterr\u00e2nea.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n

        Vantagens e desvantagens das v\u00e1lvulas de diafragma<\/h2>\r\n\r\n\r\n\r\n
        \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
        Vantagens<\/strong><\/td>\r\nDesvantagens<\/strong><\/td>\r\n<\/tr>\r\n
        Extremamente limpo<\/td>\r\nS\u00f3 pode ser usado em temperaturas moderadas (-60 a 450\u00baF)<\/td>\r\n<\/tr>\r\n
        Selo \u00e0 prova de vazamento<\/td>\r\nS\u00f3 pode ser usado em press\u00f5es moderadas (aproximadamente 300psi)<\/td>\r\n<\/tr>\r\n
        Fechamento apertado<\/td>\r\nN\u00e3o pode ser usado em opera\u00e7\u00f5es multivoltas<\/td>\r\n<\/tr>\r\n
        Manuten\u00e7\u00e3o f\u00e1cil<\/td>\r\nNenhuma dimens\u00e3o face a face padr\u00e3o da ind\u00fastria<\/td>\r\n<\/tr>\r\n
        Os reparos podem ser feitos sem interromper o gasoduto<\/td>\r\nO corpo deve ser feito de material resistente \u00e0 corros\u00e3o<\/td>\r\n<\/tr>\r\n
        Reduza o vazamento para o meio ambiente<\/td>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n","link":"https:\/\/zecovalve.com\/pt\/tag\/diaphragm-valve-function","name":"Fun\u00e7\u00e3o da v\u00e1lvula de diafragma","slug":"diaphragm-valve-function","taxonomy":"post_tag","meta":[],"yoast_head":"\nDiaphragm Valve Diagram - Diaphragm Valve Parts & Function | ZECO Valve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/pt\/tag\/diaphragm-valve-function\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Diaphragm Valve Diagram - Diaphragm Valve Parts & Function | ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"GET DIAPHRAGM VALVE DIAGRAM INFORMATION What is a Diaphragm Valve? Diaphragm valves get their name from a flexible disc that comes into contact with a seat at the top of the valve body to form a seal. A diaphragm is a flexible, pressure-responsive element that transmits force to open, close, or control a valve. Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm, instead of an elastomeric liner in the valve body, to separate the flow stream from the closure element. How do Diaphragm Valves Work? Diaphragm valves are simple in construction and operation. A valve actuator is in contact with the inner membrane (or \u201cdiaphragm\u201d) of the valve in its open position. When the user desires the valve to be shut, the actuator is pressed and\/or turned and the membrane is pushed into the edge of the solid damn, closing the valve. Certain diaphragm valves can also have half open\/restricted positions where the membrane is partially closed, allowing a throttled flow through the valve. In the next section, we will examine the broad categories of diaphragm valves and where they are most useful. Types of Diaphragm Valves Weir-Type Diaphragm Valves The weir-type diaphragm valve is one of the most common designs available and is what is shown in Figure 2, above. The raised lip\/saddle design is best suited for small flow control and is kept leak-proof thanks to the bonnet over the diaphragm and actuator. This design is optimal for dangerous or corrosive liquid and gas, as any failure with the membrane will be kept contained by this bonnet. Also, the sloped body makes this valve inherently self-draining, but this draining can happen in both valve directions which may not be optimal for some applications. The weir-type valve is mostly specified for clean, homogenous fluids, as viscous slurries and sediments may build up on either side of the saddle. They are most often found in processes such as food\/chemical, gas production, corrosive, and water applications. Straight Through Type Diaphragm Valves The straight-through diaphragm valve is structurally similar to weir-types; however, it does not contain the characteristic saddle and instead has a completely straight pathway. Their membranes are typically more flexible and allow for farther travel distance, as it must touch the very bottom of the valve. These valves must often be serviced\/replaced, as their lifespan is typically less than weir-type designs due to their more flexible membranes. Straight-through diaphragm valves are used for slurries, viscous fluids, and other applications where blocking must be reduced. They are also useful for bi-directional flow regimes, as there is no saddle to impede swift changing from inlet to outlet. Diaphragm Valve Parts The components of diaphragm valves are the following: Diaphragm Valve Bonnet The bonnet serves as the top cover and is bolted to the valve body. It protects the compressor, stem, diaphragm, and other non-wetted components of the diaphragm valve. Diaphragm Valve Body The valve body is the component directly connected to the pipeline wherein the fluid passes. The flow area inside the valve body depends on the type of diaphragm valve. Both the valve body and bonnet are constructed from strong, rigid, and corrosive resistant materials. Diaphragm Valve Diaphragm The diaphragm is made from a highly elastic polymeric disc that moves down to touch the bottom of the valve body to limit or obstruct the passage of fluid. The diaphragm lifts if the fluid flow rate is to be increased or the valve is to be fully opened. The fluid flows underneath the diaphragm. However, this component limits the valve\u2019s operating temperature and pressure due to the diaphragm\u2019s material and structure. It must also be replaced periodically since its mechanical properties degrade during usage. The diaphragm isolates the non-wetted components (compressor, stem, and actuator) from the flowing media. Therefore, solids and viscous fluids are less likely to interfere with the operating mechanism of the diaphragm valve. This also protects the non-wetted components from corrosion. Conversely, the fluid in the pipeline will not be contaminated with the lubricant used in operating the valve. Material of Diaphragm Valve Diaphragm Unlined or Rubber Lined Type NR\/Natural Rubber NBR\/Nitrile\/Buna-N EPDM FKM\/Viton BUNA-N SI\/Silicone rubber Leather Fluorine Plastic Type FEP, with EPDM backing PTFE, with EPDM backing PFA, with EPDM backing Diaphragm Valve Compressor The compressor is a disc that lies between the valve stem and the diaphragm. It supports the diaphragm valve and distributes the forces from the stem during linear movement. The compressor design is optimized to provide better flow throttling and control. Diaphragm Valve Stem The stem is a vertical shaft connected to the compressor that exerts linear motion to move both compressor and diaphragm, thus operating the diaphragm valve. It transmits the motion exerted by the actuator. Diaphragm valves can either have piston- or threaded-type stems. As the name implies, piston-type valves are moved by a piston assembly inside the bonnet, with the valve stem likely acting as the piston rod. This type requires linear force exerted by fluid pressure. Threaded stem valves have a matching stem nut. This type requires torque to linearly move the stem, as well as lubrication for smooth motion. The threaded stems of diaphragm valves can have a rising or non-rising mechanism: Rising Stem: Rising stems or indicating stems extend their length up to the handwheel. As the handwheel is turned, the stem rises or descends to open or close the valve, respectively. Hence, it is easier to determine the extent to which the valve is opened by looking at the amount of stem exposed. However, rising stems take up more space than non-rising stems. Non-Rising Stem: Non-rising stems or non-indicating stems are rotated to open or close the valve, but it does not cause the stem to move up or down. Non-rising stem valves are used in limited spaces, such as in underground piping systems. Advantages and Disadvantages of Diaphragm Valves Advantages Disadvantages Extremely clean Can only be used at moderate temperatures (-60 to 450\u00baF) Leak proof seal Can only be used in moderate pressures (approximately 300psi) Tight shut-off Cannot be used in multi-turn operations Easy maintenance No industry standard face-to-face dimensions Repairs can be made without interrupting the pipeline The body must be made of corrosive resistant material Reduce leakage to the environment\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zecovalve.com\/pt\/tag\/diaphragm-valve-function\" \/>\n<meta property=\"og:site_name\" content=\"ZECO Valve\" \/>\n<meta property=\"og:image\" content=\"https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/07\/20220708083634-62c7ec92aba44.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/zecovalve.com\/#website\",\"url\":\"https:\/\/zecovalve.com\/\",\"name\":\"ZECO Valve\",\"description\":\"Industrial Ball Valve, Gate Valve and Globe Valve Manufacturer\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/zecovalve.com\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"CollectionPage\",\"@id\":\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function#webpage\",\"url\":\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function\",\"name\":\"Diaphragm Valve Diagram - Diaphragm Valve Parts & Function | ZECO Valve\",\"isPartOf\":{\"@id\":\"https:\/\/zecovalve.com\/#website\"},\"breadcrumb\":{\"@id\":\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/zecovalve.com\/\",\"url\":\"https:\/\/zecovalve.com\/\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"position\":2,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function\",\"url\":\"https:\/\/zecovalve.com\/tag\/diaphragm-valve-function\",\"name\":\"Diaphragm Valve Function\"}}]}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","_links":{"self":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags\/2703","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags"}],"about":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/taxonomies\/post_tag"}],"wp:post_type":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/posts?tags=2703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}