{"id":1884,"count":8,"description":"\r\n\r\n\r\n\r\nOBTER INFORMA\u00c7\u00d5ES DA WIKIP\u00c9DIA DA V\u00c1LVULA DE GATE<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n

Constru\u00e7\u00e3o de v\u00e1lvulas gaveta<\/h2>\r\n\r\n\r\n\r\n\r\nCommon gate valves are actuated by a threaded stem that connects the actuator (e.g. handwheel or motor) to the gate. They are characterized as having either a rising or a non-rising stem, depending on which end of the stem is threaded. Rising stems are fixed to the gate and rise and lower together as the valve is operated, providing a visual indication of valve position. The actuator is attached to a nut that is rotated around the threaded stem to move it. Non rising stem valves are fixed to, and rotate with, the actuator, and are threaded into the gate. They may have a pointer threaded onto the stem to indicate valve position since the gate's motion is concealed inside the valve. Non rising stems are used where vertical space is limited.\r\n\r\n\r\n\r\n\r\n\r\nAs v\u00e1lvulas gaveta podem ser acionadas manualmente (volante) ou eletricamente por meio de um motor de alto torque.\r\n\r\n\r\n\r\n\r\n\r\nA comporta deslizante (disco) pode ser em forma de cunha (c\u00f4nica) ou paralela. Os designs em forma de cunha incluem designs de cunha s\u00f3lida, flex\u00edvel e dividida.\r\n\r\n\r\n\r\n\r\n\r\nOs an\u00e9is da sede s\u00e3o usados para facilitar a substitui\u00e7\u00e3o de uma sede desgastada\/com vazamento. Os an\u00e9is de sede t\u00eam uma rosca no lado reverso que pode ser aparafusada no corpo da v\u00e1lvula principal; a superf\u00edcie plana no lado oposto \u00e9 a \u00e1rea da superf\u00edcie de sede que pressiona o disco. Se os an\u00e9is de sede n\u00e3o forem usados, \u00e9 poss\u00edvel usinar uma sede plana no pr\u00f3prio corpo da v\u00e1lvula principal; infelizmente, isso impossibilita a substitui\u00e7\u00e3o da sede e a sede s\u00f3 pode ser usinada algumas vezes antes que toda a v\u00e1lvula seja substitu\u00edda.\r\n\r\n\r\n\r\n\r\n\r\nOs castelos das v\u00e1lvulas gaveta geralmente s\u00e3o constru\u00eddos em ferro fundido. O ferro fundido \u00e9 quebradi\u00e7o e isso torna o cap\u00f4 propenso a rachar. Cuidado especial deve ser tomado ao manusear e manter v\u00e1lvulas com castelos de ferro fundido.\r\n\r\n\r\n\r\n\r\n\r\n\u00c0 medida que a haste penetra no castelo da v\u00e1lvula, \u00e9 necess\u00e1ria a instala\u00e7\u00e3o de uma gaxeta de veda\u00e7\u00e3o para evitar que ocorra vazamento pelo v\u00e3o entre a haste e o castelo; a veda\u00e7\u00e3o geralmente \u00e9 obtida usando o material de veda\u00e7\u00e3o fibroso.\r\n\r\n\r\n\r\n\r\n\r\nOs flanges s\u00e3o instalados no lado de suc\u00e7\u00e3o e descarga da v\u00e1lvula para que a tubula\u00e7\u00e3o possa ser facilmente conectada.\r\n\r\n\r\n\r\n\r\n

Tipos de v\u00e1lvula gaveta<\/h2>\r\n\r\n\r\n\r\n\r\nA comporta vem em v\u00e1rios designs e tecnologias para produzir veda\u00e7\u00e3o eficaz para diferentes aplica\u00e7\u00f5es.\r\n\r\n\r\n\r\n\r\n\r\nV\u00e1lvula guilhotina\r\n\r\n\r\n\r\n\r\n\r\nUma v\u00e1lvula guilhotina \u00e9 usada para fluidos espessos e s\u00f3lidos secos a granel. O port\u00e3o \u00e9 apenas uma pe\u00e7a de metal, normalmente pontiaguda como uma faca. Essas v\u00e1lvulas s\u00e3o autolimpantes, pois passam pelos an\u00e9is da sede sempre que abrem e fecham.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvula de gaveta em cunha<\/h3>\r\n\r\n\r\n\r\n\r\nA wedge gate valve has a gate in the shape of a wedge that sits on two inclined seats. In addition to the primary force created by fluid pressure, a high wedging force on the seats created by the stem tightening assists with the sealing. The wedge-shaped gate does not stick to the seat in case of high fluid differential pressure and has an increased service life due to less \"rubbing\" on the seats. However, wedge-shaped gate valves have an additional compression load on the seats that may result in thermal binding and restricted valve opening due to expansion.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvula corredi\u00e7a paralela<\/h3>\r\n\r\n\r\n\r\n\r\nUma v\u00e1lvula corredi\u00e7a paralela tem uma comporta plana e assentos paralelos a ela. As v\u00e1lvulas de gaveta paralela usam press\u00e3o de linha e posicionamento para fazer uma veda\u00e7\u00e3o herm\u00e9tica. Os port\u00f5es planos s\u00e3o compostos por duas pe\u00e7as e possuem uma mola no meio. A mola empurra as pe\u00e7as em dire\u00e7\u00e3o \u00e0s sedes para maior veda\u00e7\u00e3o. Devido ao seu design inerente, as v\u00e1lvulas gaveta paralelas apresentam uma vantagem de seguran\u00e7a em aplica\u00e7\u00f5es de temperaturas mais altas. Al\u00e9m disso, como n\u00e3o h\u00e1 a\u00e7\u00e3o de cunha em port\u00f5es paralelos, os torques de fechamento s\u00e3o comparativamente menores, resultando em atuadores menores e menos dispendiosos ou em menos esfor\u00e7o manual. Devido ao seu deslizamento na posi\u00e7\u00e3o, os port\u00f5es paralelos mant\u00eam a sujeira longe das superf\u00edcies de assentamento.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvula de porta de laje<\/h3>\r\n\r\n\r\n\r\n\r\nAs comportas de laje, tamb\u00e9m chamadas de v\u00e1lvulas de passagem de condu\u00edte, s\u00e3o comportas de uma unidade que incluem um furo de di\u00e2metro interno. O furo est\u00e1 alinhado com os an\u00e9is de duas sedes no estado aberto. Este alinhamento cria um fluxo suave com turbul\u00eancia m\u00ednima. Este design exclusivo permite perda m\u00ednima de press\u00e3o no sistema e \u00e9 perfeito para o transporte de petr\u00f3leo bruto e l\u00edquidos de g\u00e1s natural (LGN). As sedes das v\u00e1lvulas permanecem limpas. No entanto, a cavidade do disco pode capturar materiais estranhos. Portanto, a cavidade normalmente possui um tamp\u00e3o embutido para fins de manuten\u00e7\u00e3o de drenagem do material estranho acumulado.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvula de gaveta de expans\u00e3o paralela<\/h3>\r\n\r\n\r\n\r\n\r\nExpanding gate valves have two slab gates matched together that provide sealing through the mechanical expansion of the gate, as seen in Figure 5. When lifted, both of the slab gate's cavities allow the media to flow. The upward force on one slab and the stoppage of the second slab, by a step in the valve body, allows for outward mechanical expansion for a proper seal. When closed, the slab gates block the media flow, and the downward force (stem) on one slab and upward force (step in valve body) allows for outward mechanical expansion for a proper seal.\r\n\r\n\r\n\r\n\r\n\r\nEstas v\u00e1lvulas proporcionam uma veda\u00e7\u00e3o eficaz simultaneamente para sedes a montante e a jusante. Essa veda\u00e7\u00e3o as torna ideais para aplica\u00e7\u00f5es como v\u00e1lvulas de isolamento em usinas de energia, v\u00e1lvulas de bloqueio em sistemas de processo e v\u00e1lvulas de alta temperatura em refinarias.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvulas de gaveta com sede met\u00e1lica vs com sede resiliente<\/h2>\r\n\r\n\r\n\r\n\r\nAntes da v\u00e1lvula gaveta com sede resiliente ser introduzida no mercado, as v\u00e1lvulas gaveta com cunha com sede met\u00e1lica eram amplamente utilizadas. O design de cunha c\u00f4nica e os dispositivos de veda\u00e7\u00e3o angular de uma cunha com sede de metal exigem uma depress\u00e3o no fundo da v\u00e1lvula para garantir um fechamento herm\u00e9tico. Com isto, areia e seixos s\u00e3o incrustados no furo. O sistema de tubula\u00e7\u00e3o nunca estar\u00e1 completamente livre de impurezas, independentemente de qu\u00e3o bem o tubo seja lavado durante a instala\u00e7\u00e3o ou reparo. Assim, qualquer cunha de metal acabar\u00e1 por perder a sua capacidade de ser estanque.\r\n\r\n\r\n\r\n\r\n\r\nUma v\u00e1lvula gaveta com sede resiliente possui um fundo de v\u00e1lvula simples, permitindo a passagem livre de areia e pedras na v\u00e1lvula. Se as impurezas passarem quando a v\u00e1lvula fechar, a superf\u00edcie de borracha fechar\u00e1 em torno das impurezas enquanto a v\u00e1lvula estiver fechada. Um composto de borracha de alta qualidade absorve as impurezas quando a v\u00e1lvula fecha e as impurezas ser\u00e3o eliminadas quando a v\u00e1lvula for aberta novamente. A superf\u00edcie de borracha recuperar\u00e1 sua forma original garantindo uma veda\u00e7\u00e3o herm\u00e9tica.\r\n\r\n\r\n\r\n\r\n\r\nA grande maioria das v\u00e1lvulas de gaveta tem sede resiliente, no entanto, as v\u00e1lvulas de gaveta com sede met\u00e1lica ainda s\u00e3o solicitadas em alguns mercados, por isso ainda fazem parte da nossa gama para abastecimento de \u00e1gua e tratamento de \u00e1guas residuais.\r\n\r\n","link":"https:\/\/zecovalve.com\/pt\/tag\/gate-valve-wikipedia","name":"V\u00e1lvula de gaveta Wikip\u00e9dia","slug":"gate-valve-wikipedia","taxonomy":"post_tag","meta":[],"yoast_head":"\nGate Valve Wikipedia - Gate Valve Suppliers | 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\/gate-valve-wikipedia\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gate Valve Wikipedia - Gate Valve Suppliers | ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"GET GATE VALVE WIKIPEDIA INFORMATION Construction of Gate Valves Common gate valves are actuated by a threaded stem that connects the actuator (e.g. handwheel or motor) to the gate. They are characterized as having either a rising or a non-rising stem, depending on which end of the stem is threaded. Rising stems are fixed to the gate and rise and lower together as the valve is operated, providing a visual indication of valve position. The actuator is attached to a nut that is rotated around the threaded stem to move it. Non rising stem valves are fixed to, and rotate with, the actuator, and are threaded into the gate. They may have a pointer threaded onto the stem to indicate valve position since the gate’s motion is concealed inside the valve. Non rising stems are used where vertical space is limited. Gate valves can be actuated manually (handwheel) or electrically using a high torque motor. The sliding gate (disc) can be wedge-shaped (tapered) or parallel-shaped. Wedge shape designs include solid, flexible, and split wedge designs. Seat rings are used to make the replacement of a worn\/leaking seat easier. Seat rings have a screw thread on the reverse side which can be screwed into the main valve body, the flat surface on the opposite side is the seating surface area that presses against the disc. If seat rings are not used, it is possible to machine a flat seat on the main valve body itself, unfortunately, this makes replacing the seat impossible and the seat can only be machined a few times before the entire valve must be replaced. Gate valve bonnets are often constructed of cast iron. Cast iron is brittle and this makes the bonnet prone to cracking. Special care should be taken when handling and maintaining valves with cast iron bonnets. As the stem penetrates through the valve bonnet, it is necessary to install a sealing gland to prevent leakage from occurring through the gap between the stem and bonnet; sealing is usually achieved using the fibrous packing material. Flanges are installed on the suction and discharge side of the valve so that piping can be easily connected. Gate Valve Types The gate comes in various designs and technologies to produce effective sealing for differing applications. Knife gate valve A knife gate valve is used for thick fluids and dry bulk solids. The gate is only one piece of metal, which is typically pointed like a knife. These valves are self-cleaning as they pass the seat rings every time they open and close. Wedge Gate Valve A wedge gate valve has a gate in the shape of a wedge that sits on two inclined seats. In addition to the primary force created by fluid pressure, a high wedging force on the seats created by the stem tightening assists with the sealing. The wedge-shaped gate does not stick to the seat in case of high fluid differential pressure and has an increased service life due to less “rubbing” on the seats. However, wedge-shaped gate valves have an additional compression load on the seats that may result in thermal binding and restricted valve opening due to expansion. Parallel Slide Gate Valve A parallel slide gate valve has a flat gate and seats parallel to it. Parallel slide gate valves use line pressure and positioning to make a tight seal. Flat gates consist of two pieces and have a spring in the middle. The spring pushes the pieces towards the seats for enhanced sealing. Due to their inherent design, parallel gate valves have a safety advantage in higher-temperature applications. Furthermore, since there is no wedging action in parallel gates, closing torques are comparatively smaller, resulting in smaller, less expensive actuators or less manual effort. Due to their sliding into position, parallel gates keep dirt away from the seating surfaces. Slab Gate Valve Slab gates, also called through-conduit gate valves, are one-unit gates that include a bore-size hole. The bore is in line with the two-seat rings in the open state. This alignment creates a smooth flow with minimal turbulence. This unique design allows for minimal pressure loss in the system and is perfect for the transportation of crude oil and natural gas liquids (NGLs). The valve seats remain clean. However, the disc cavity can capture foreign material. Therefore, the cavity typically has a built-in plug for maintenance purposes of draining the accumulated foreign material. Parallel Expanding Gate Valve Expanding gate valves have two slab gates matched together that provide sealing through the mechanical expansion of the gate, as seen in Figure 5. When lifted, both of the slab gate’s cavities allow the media to flow. The upward force on one slab and the stoppage of the second slab, by a step in the valve body, allows for outward mechanical expansion for a proper seal. When closed, the slab gates block the media flow, and the downward force (stem) on one slab and upward force (step in valve body) allows for outward mechanical expansion for a proper seal. These valves provide an effective seal simultaneously for both upstream and downstream seats. This seal makes them ideal for applications like isolation valves in power plants, block valves in process systems, and high-temperature valves in refineries. Metal seated vs Resilient Seated Gate Valves Before the resilient seated gate valve was introduced to the market, gate valves with a metal seated wedge were widely used. The conical wedge design and angular sealing devices of a metal seated wedge require a depression in the valve bottom to ensure a tight closure. Herewith, sand and pebbles are embedded in the bore. The pipe system will never be completely free from impurities regardless of how thoroughly the pipe is flushed upon installation or repair. Thus, any metal wedge will eventually lose its ability to be drop-tight. A resilient seated gate valve has a plain valve bottom allowing free passage for sand and pebbles in the valve. If impurities pass as the valve closes, the rubber surface will close around the impurities while the valve is closed. A high-quality rubber compound absorbs the impurities as the valve closes, and the impurities will be flushed away when the valve is opened again. The rubber surface will regain its original shape by securing a drop-tight sealing. The vast majority of gate valves are resilient seated, however, metal seated gate valves are still requested in some markets, so they are still part of our range for water supply and wastewater treatment.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zecovalve.com\/pt\/tag\/gate-valve-wikipedia\" \/>\n<meta property=\"og:site_name\" content=\"ZECO Valve\" \/>\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\/gate-valve-wikipedia#webpage\",\"url\":\"https:\/\/zecovalve.com\/tag\/gate-valve-wikipedia\",\"name\":\"Gate Valve Wikipedia - Gate Valve Suppliers | ZECO Valve\",\"isPartOf\":{\"@id\":\"https:\/\/zecovalve.com\/#website\"},\"breadcrumb\":{\"@id\":\"https:\/\/zecovalve.com\/tag\/gate-valve-wikipedia#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/zecovalve.com\/tag\/gate-valve-wikipedia\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/zecovalve.com\/tag\/gate-valve-wikipedia#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\/gate-valve-wikipedia\",\"url\":\"https:\/\/zecovalve.com\/tag\/gate-valve-wikipedia\",\"name\":\"Gate Valve Wikipedia\"}}]}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","_links":{"self":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags\/1884","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=1884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}