{"id":3110,"count":5,"description":"\r\n\r\nEm processos qu\u00edmicos espec\u00edficos, os fluidos nas tubula\u00e7\u00f5es s\u00e3o frequentemente t\u00f3xicos, radioativos e perigosos. V\u00e1lvulas seladas por fole s\u00e3o usadas para evitar vazamento de qualquer produto qu\u00edmico t\u00f3xico na atmosfera. O fole pode ser fornecido em diferentes materiais como 316Ti, 321, C276 ou Liga 625. O material do corpo pode ser selecionado entre todos os materiais dispon\u00edveis.\r\n\r\n\r\n\r\n\r\n\r\nLeakage at various points in pipelines found in chemical plants creates emissions. All such leakage points can be detected using various methods and instruments and should be noted by the plant engineer. Critical leakage points include flanged gasket joints and the Valve\/pump gland packing, etc. Today the chemical process industry is gearing itself towards safer technology for better environmental protection and it has become every process engineer's responsibility to design plants that limit damage to the environment through the prevention of leakage of any toxic chemicals.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nOBTER O PRE\u00c7O DA V\u00c1LVULA DE GATE DE VEDA\u00c7\u00c3O DE FOLE<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n

O que \u00e9 v\u00e1lvula de veda\u00e7\u00e3o de fole?<\/h2>\r\n\r\n\r\n\r\n\r\nUma v\u00e1lvula de gaveta com veda\u00e7\u00e3o de fole \u00e9 uma v\u00e1lvula especialmente projetada, adequada para uso em ind\u00fastrias que lidam com meios perigosos, onde at\u00e9 mesmo vazamentos m\u00ednimos podem ser extremamente cr\u00edticos. Com o crescimento exponencial de novas ind\u00fastrias, como as ind\u00fastrias qu\u00edmica e nuclear, h\u00e1 uma abund\u00e2ncia crescente de meios inflam\u00e1veis, perigosos, extremamente venenosos e t\u00f3xicos que fluem atrav\u00e9s dos oleodutos. Isso cria um alto risco de vazamento, explos\u00e3o e riscos \u00e0 sa\u00fade. Portanto, as v\u00e1lvulas usadas em tais tubos e sistemas t\u00eam requisitos rigorosos espec\u00edficos de vazamento e veda\u00e7\u00e3o.\r\n\r\n\r\n\r\n\r\n

Constru\u00e7\u00e3o de fole da v\u00e1lvula gaveta selada por fole<\/h2>\r\n\r\n\r\n\r\n\r\nO cartucho abaixo \u00e9 soldado ao castelo da v\u00e1lvula e \u00e0 haste da v\u00e1lvula. O cartucho abaixo tem um n\u00famero de convolu\u00e7\u00f5es e estas convolu\u00e7\u00f5es tornam-se comprimidas ou expandidas dependendo do movimento da haste da v\u00e1lvula. (Cientificamente falando, o fole fica comprimido quando a v\u00e1lvula est\u00e1 na posi\u00e7\u00e3o aberta e expandido quando a v\u00e1lvula est\u00e1 na condi\u00e7\u00e3o fechada). \u00c9 importante instalar corretamente os corpos das v\u00e1lvulas. O fole pode ser vedado \u00e0s v\u00e1lvulas de duas maneiras diferentes. Em primeiro lugar, o fole pode ser soldado \u00e0 haste da v\u00e1lvula na parte superior e ao corpo da v\u00e1lvula na parte inferior. Neste caso, o fluido do processo est\u00e1 contido dentro do fole, ou no segundo m\u00e9todo o fole \u00e9 soldado \u00e0 haste da v\u00e1lvula na parte inferior e ao corpo na parte superior. Neste caso, o fluido do processo fica contido na regi\u00e3o anular entre a tampa da v\u00e1lvula e o fole (por fora).\r\n\r\n\r\n\r\n\r\n\r\nO fole \u00e9 um componente cr\u00edtico e forma o cora\u00e7\u00e3o das v\u00e1lvulas de veda\u00e7\u00e3o do fole. Para evitar qualquer tor\u00e7\u00e3o do fole a V\u00e1lvula deve possuir haste apenas com movimento linear. Isto pode ser conseguido usando uma chamada porca de luva na parte do garfo da tampa da v\u00e1lvula. Um volante \u00e9 montado na porca da luva que transfere efetivamente um movimento rotativo do volante em um movimento linear na haste da v\u00e1lvula.\r\n\r\n\r\n\r\n\r\n

Tipos de fole de v\u00e1lvula de veda\u00e7\u00e3o de fole<\/h2>\r\n\r\n\r\n\r\n\r\nThere are two main types of bellow.. the Forged Bellow and the Welded Bellow. Formed-type bellows are made by rolling a flat sheet (thin wall foil) into a tube which is then longitudinally fusion welded. This tube is subsequently mechanically or hydrostatically formed into a bellow with rounded and widely spaced folds. The welded leaf type bellow is made by welding washer-like plates of thin metal together at both the inner and outer circumference of the washers - like plates. A welded leaf bellow has more folds per unit length as compared to forged bellows. Thus, for the same stroke length, forged bellows are two to three times longer than their welded leaf counterparts.\r\n\r\n\r\n\r\n\r\n\r\nAlegadamente, o fole forjado mecanicamente falha em pontos aleat\u00f3rios, enquanto a folha soldada geralmente falha na solda ou perto dela. Para garantir a penetra\u00e7\u00e3o total das extremidades do fole e da soldagem do colar final, \u00e9 aconselh\u00e1vel fabricar usando soldagem micro plasma.\r\n\r\n\r\n\r\n\r\n

Projeto de fole da v\u00e1lvula de veda\u00e7\u00e3o de fole<\/h2>\r\n\r\n\r\n\r\n\r\nO design do fole com m\u00faltiplas camadas \u00e9 preferido para lidar com fluidos de alta press\u00e3o (geralmente duas ou tr\u00eas camadas da parede met\u00e1lica). Um fole de duas camadas pode aumentar sua classifica\u00e7\u00e3o de press\u00e3o de 80% a 100% em compara\u00e7\u00e3o com um fole de camada \u00fanica da mesma espessura. Alternativamente, se for utilizado um fole de camada \u00fanica com uma espessura equivalente \u00e0 classifica\u00e7\u00e3o de press\u00e3o de um fole de duas camadas, o comprimento do curso \u00e9 reduzido. Assim, um projeto de fole de m\u00faltiplas camadas oferece uma vantagem distinta sobre um fole de camada \u00fanica. \u00c9 claro que o fole est\u00e1 sujeito \u00e0 fadiga do metal e esta fadiga pode induzir falha na solda. A vida \u00e0 fadiga do fole \u00e9 afetada pelo material de constru\u00e7\u00e3o, t\u00e9cnica de fabrica\u00e7\u00e3o, comprimento do curso e frequ\u00eancia do curso, al\u00e9m dos par\u00e2metros usuais, como temperatura e press\u00e3o do fluido.\r\n\r\n\r\n\r\n\r\n

Especifica\u00e7\u00e3o da v\u00e1lvula de veda\u00e7\u00e3o de fole<\/h2>\r\n\r\n\r\n\r\n
    \r\n \t
  • Padr\u00e3o de projeto: ASME B16.34<\/li>\r\n \t
  • Dimens\u00e3o face a face: ASME B16.10<\/li>\r\n \t
  • Extremidades flangeadas: ASME B16.5<\/li>\r\n \t
  • Teste e inspe\u00e7\u00e3o: API 598<\/li>\r\n \t
  • Tamanho nominal: NPS 1\/2~16<\/li>\r\n \t
  • Classifica\u00e7\u00e3o de press\u00e3o: CL.150\uff5eCL.1500<\/li>\r\n \t
  • Conex\u00e3o final: RF\/RTJ\/BW\/SW<\/li>\r\n \t
  • Material do corpo: Fundi\u00e7\u00e3o e Forjamento (A\u00e7o Carbono, SS, Duplex, Hastelloy)<\/li>\r\n \t
  • Material de acabamento: conforme padr\u00e3o ou exig\u00eancia do pedido<\/li>\r\n \t
  • Material abaixo:304\/304L\/316\/316L\/Inconel600\/625\/718<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n

    Caracter\u00edsticas da v\u00e1lvula de veda\u00e7\u00e3o de fole<\/h2>\r\n\r\n\r\n\r\n
      \r\n \t
    • Fole de longa vida \u00fatil (3.000 ciclos): Projetado e testado para qualifica\u00e7\u00e3o para servi\u00e7o em alta press\u00e3o\/temperatura.<\/li>\r\n \t
    • Porta de monitoramento do fole (opcional): Um plugue pode ser conectado ao espa\u00e7o acima do fole para monitorar o desempenho.<\/li>\r\n \t
    • Duas veda\u00e7\u00f5es secund\u00e1rias da haste: a) Banco traseiro em posi\u00e7\u00e3o aberta; b) Gaxeta de grafite.<\/li>\r\n \t
    • Faces de assentamento superiores: Assentos em liga de CoCr com superf\u00edcie dura e a cunha \u00e9 em liga s\u00f3lida de CoCr.<\/li>\r\n \t
    • Cada v\u00e1lvula \u00e9 testada de acordo com API 598.<\/li>\r\n \t
    • Cada conjunto abaixo \u00e9 testado contra vazamento de h\u00e9lio para garantir vazamento zero.<\/li>\r\n \t
    • As hastes n\u00e3o rotativas evitam a tor\u00e7\u00e3o do fole.<\/li>\r\n \t
    • As veda\u00e7\u00f5es da haste secund\u00e1ria incluem:<\/li>\r\n \t
    • Banco traseiro da haste<\/li>\r\n \t
    • Gaxeta de haste API 624<\/li>\r\n \t
    • Acess\u00f3rios lubrificantes para garantir a lubrifica\u00e7\u00e3o adequada da bucha da haste para abertura e fechamento eficientes.<\/li>\r\n \t
    • V\u00e1rios materiais de fole est\u00e3o dispon\u00edveis: 316Ti, Hastelloy, Inconel, Monel, etc.<\/li>\r\n \t
    • Todos os foles s\u00e3o hidroformados com no m\u00ednimo duas camadas.<\/li>\r\n \t
    • Dispon\u00edvel nas classes de press\u00e3o 150-1500 (todos os materiais do corpo dispon\u00edveis)<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n

      Aplica\u00e7\u00f5es da v\u00e1lvula gaveta selada com fole<\/h2>\r\n\r\n\r\n\r\n\r\nO sistema de \u00f3leo quente, sistema de vapor, sistema de \u00e1gua quente e fria, etc.\r\n\r\n","link":"https:\/\/zecovalve.com\/pt\/tag\/bellows-seal-gate-valve","name":"V\u00e1lvula de veda\u00e7\u00e3o de fole","slug":"bellows-seal-gate-valve","taxonomy":"post_tag","meta":[],"yoast_head":"\nBellows Seal Gate Valve - Bellow Seal Gate Valve | 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\/bellows-seal-gate-valve\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bellows Seal Gate Valve - Bellow Seal Gate Valve | ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"In particular chemical processes, the fluids in the pipes are often toxic, radioactive, and hazardous. Bellow sealed valves are used to prevent leakage of any toxic chemical into the atmosphere. The bellow can be supplied in different materials like 316Ti, 321, C276, or Alloy 625. Body material can be selected from all available materials. Leakage at various points in pipelines found in chemical plants creates emissions. All such leakage points can be detected using various methods and instruments and should be noted by the plant engineer. Critical leakage points include flanged gasket joints and the Valve\/pump gland packing, etc. Today the chemical process industry is gearing itself towards safer technology for better environmental protection and it has become every process engineer’s responsibility to design plants that limit damage to the environment through the prevention of leakage of any toxic chemicals. GET BELLOW SEAL GATE VALVE PRICE What is Bellow Seal Gate Valve? A Bellow Seal Gate Valve is a specially designed valve suitable for use in industries dealing with a hazardous medium where even minute leakages can be extremely critical. With the exponential growth of new industries such as the chemical and nuclear industries, there is a growing abundance of flammable, hazardous, extremely poisonous, and toxic media flowing through the pipelines. This creates a high risk of leakage, explosion, and health hazards. So, the valves used in such pipes and systems have specific stringent leakage and sealing requirements. Bellow Construction of Bellow Sealed Gate Valve The bellow cartridge is welded to both the Valve Bonnet and the Valve stem. The bellow cartridge has a number of convolutions and these convolutions become compressed or expanded depending upon the movement of the Valve stem. (Scientifically speaking the bellow gets compressed when the Valve is in the open position and expanded when the Valve is in the closed condition). It is important to properly install the Valve bodies. The bellow can be sealed to the Valves in two different ways. Firstly, the bellow can be welded to the Valve stem at the top and the Valve body at the bottom. In this case, the process fluid is contained inside the bellow, or in the second method the bellow is welded to the Valve stem at the bottom and the body on the top. In this case, the process fluid is contained in the annular region between the Valve Bonnet and bellow (from the outside). The bellow is a critical component and forms the heart of the bellow seal Valves. To avoid any twisting of the bellow the Valve must have a stem with linear movement only. This can be achieved using a so-called sleeve nut at the Yoke portion of the Valve Bonnet. A handwheel is fitted onto the sleeve-nut which effectively transfers a rotary motion of the handwheel into a linear motion in the Valve stem. Bellow types of Bellow Seal Gate Valve There are two main types of bellow.. the Forged Bellow and the Welded Bellow. Formed-type bellows are made by rolling a flat sheet (thin wall foil) into a tube which is then longitudinally fusion welded. This tube is subsequently mechanically or hydrostatically formed into a bellow with rounded and widely spaced folds. The welded leaf type bellow is made by welding washer-like plates of thin metal together at both the inner and outer circumference of the washers – like plates. A welded leaf bellow has more folds per unit length as compared to forged bellows. Thus, for the same stroke length, forged bellows are two to three times longer than their welded leaf counterparts. Reportedly, mechanically forged bellows fail at random spots, while the welded leaf usually fails at or near a weld. To ensure full penetration of bellow ends and end coller welding it is advisable to fabricate using micro plasma welding. Bellow Design of Bellows Seal Gate Valve The multi-ply bellow design is preferred for handling higher-pressure fluids (generally two or three plies of the metal wall). A two-ply bellow can increase its pressure rating by 80% to 100% as compared to a single ply bellow of the same thickness. Alternatively, if a single ply bellow of a thickness equivalent to a pressure rating of a two-ply bellow is used, the stroke length is reduced. Thus, a multi-ply bellow design offers a distinct advantage over a single ply bellow. It is clear that the bellow is subject to metal fatigue and this fatigue can induce weld failure. The bellow fatigue life is affected by the material of construction, fabrication technique, stroke length, and stroke frequency, in addition to the usual parameters such as fluid temperature and pressure. Specification of Bellow Seal Gate Valve Design standard: ASME B16.34 Face to face dimension: ASME B16.10 Flanged ends: ASME B16.5 Test & inspection: API 598 Nominal Size: NPS 1\/2\uff5e16 Pressure Rating: CL.150\uff5eCL.1500 End Connection: RF\/RTJ\/BW\/SW Body Material: Casting & Forging(Carbon Steel, SS, Duplex, Hastelloy) Trim Material: As per standard or order requirement Bellow Material\uff1a304\/304L\/316\/316L\/Inconel600\/625\/718 Features of Bellows Seal Gate Valve Long cycle life bellows (3000 cycles): Designed and qualification tested for high pressure\/temperature service. Bellows monitoring port (optional): A plug can be connected to the space above the bellows to monitor performance. Two secondary stem seals: a) Backseat in an open position; b) Graphite packing. Superior seating faces: Seats CoCr alloy hardfaced and the wedge is solid CoCr alloy. Each valve is tested per API 598. Every bellow assembly is helium leak-tested to assure zero leakage. Non-rotating stems prevent torsion of bellow. Secondary stem seals include: Stem backseat API 624 stem packing Lubricant fittings to ensure proper lubrication of stem bushing for efficient opening and closing. Multiple bellows materials are available: 316Ti, Hastelloy, Inconel, Monel, etc. All bellows are hydroformed with a minimum of two layers. Available in pressure classes 150-1500 (All body materials available) Applications of Bellow Sealed Gate Valve The hot oil system, steam system, hot and cold water system, etc.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zecovalve.com\/pt\/tag\/bellows-seal-gate-valve\" \/>\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\/bellows-seal-gate-valve#webpage\",\"url\":\"https:\/\/zecovalve.com\/tag\/bellows-seal-gate-valve\",\"name\":\"Bellows Seal Gate Valve - Bellow Seal Gate Valve | ZECO Valve\",\"isPartOf\":{\"@id\":\"https:\/\/zecovalve.com\/#website\"},\"breadcrumb\":{\"@id\":\"https:\/\/zecovalve.com\/tag\/bellows-seal-gate-valve#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/zecovalve.com\/tag\/bellows-seal-gate-valve\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/zecovalve.com\/tag\/bellows-seal-gate-valve#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\/bellows-seal-gate-valve\",\"url\":\"https:\/\/zecovalve.com\/tag\/bellows-seal-gate-valve\",\"name\":\"Bellows Seal Gate Valve\"}}]}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","_links":{"self":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags\/3110","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=3110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}