{"id":1997,"count":4,"description":"\r\n\r\n\r\n\r\nOBTER PRE\u00c7O DO ASSENTO DE V\u00c1LVULA PCTFE<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n

O que \u00e9 material PCTFE?<\/h2>\r\n\r\n\r\n\r\n\r\nPCTFE (policlorotrifluoroetileno) PCTFE (policlorotrifluoroetileno) \u00e9 um homopol\u00edmero de clorotrifluoroetileno. PCTFE \u00e9 um fluoropol\u00edmero exclusivo capaz de manter suas propriedades f\u00edsicas em temperaturas operacionais excepcionalmente baixas.\r\n\r\n\r\n\r\n\r\n\r\nPCTFE possui excelentes caracter\u00edsticas de resist\u00eancia qu\u00edmica, resist\u00eancia \u00e0 radia\u00e7\u00e3o e inflamabilidade. O material tem uma faixa de temperatura \u00fatil de -400\u00b0F a 380\u00b0F. O PCTFE \u00e9 resistente ao fluxo a frio e possui o menor coeficiente de expans\u00e3o t\u00e9rmica de qualquer fluoropol\u00edmero sem carga. Estas caracter\u00edsticas fazem dele uma excelente escolha quando a estabilidade dimensional \u00e9 cr\u00edtica.\r\n\r\n\r\n\r\n\r\n\r\nO PCTFE \u00e9 frequentemente usado para aplica\u00e7\u00f5es aeroespaciais quando s\u00e3o necess\u00e1rias resist\u00eancia qu\u00edmica, uma ampla faixa de temperatura operacional e baixa inflamabilidade. Tamb\u00e9m \u00e9 amplamente utilizado para aplica\u00e7\u00f5es de v\u00e1lvulas criog\u00eanicas.\r\n\r\n\r\n\r\n\r\n

Principais propriedades do material PCTFE<\/h2>\r\n\r\n\r\n\r\n
    \r\n \t
  • Dimensionalmente est\u00e1vel, r\u00edgido e resistente ao fluxo frio<\/li>\r\n \t
  • Permea\u00e7\u00e3o e libera\u00e7\u00e3o de gases muito baixas<\/li>\r\n \t
  • Absor\u00e7\u00e3o de umidade quase zero<\/li>\r\n \t
  • Excelente resist\u00eancia qu\u00edmica<\/li>\r\n \t
  • Alta resist\u00eancia \u00e0 compress\u00e3o<\/li>\r\n \t
  • Baixa deforma\u00e7\u00e3o sob carga<\/li>\r\n \t
  • N\u00e3o inflam\u00e1vel<\/li>\r\n \t
  • Faixa de temperatura: -400\u00b0 a 380\u00b0F<\/li>\r\n \t
  • Resist\u00eancia \u00e0 radia\u00e7\u00e3o<\/li>\r\n<\/ul>\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\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\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    Propriedade<\/td>\r\nValor<\/td>\r\nUnidades<\/td>\r\nM\u00e9todo<\/td>\r\n<\/tr>\r\n
    Resist\u00eancia \u00e0 trac\u00e7\u00e3o<\/td>\r\n4860 - 5710\r\n34 - 39<\/td>\r\npsi\r\nMPa<\/td>\r\nD 638<\/td>\r\n<\/tr>\r\n
    Alongamento<\/td>\r\n100 - 250<\/td>\r\n%<\/td>\r\nD 638<\/td>\r\n<\/tr>\r\n
    Resist\u00eancia \u00e0 flex\u00e3o, 73\u00b0F<\/td>\r\n9570 - 10300\r\n66 - 71<\/td>\r\npsi\r\nMPa<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    M\u00f3dulo flex\u00edvel<\/td>\r\n200 \u2013 243 x 103\r\n1.4 \u2013 1.7<\/td>\r\npsi\r\nMPa<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Resist\u00eancia ao impacto, Izod, 23 graus C<\/td>\r\n2,5 \u2013 3,5<\/td>\r\np\u00e9s-lb\/pol.<\/td>\r\nD 256<\/td>\r\n<\/tr>\r\n
    Tens\u00e3o compressiva na deforma\u00e7\u00e3o 1%,<\/td>\r\n1570 \u2013 1860\r\n11 - 13<\/td>\r\npsi\r\nMPa<\/td>\r\nD 695<\/td>\r\n<\/tr>\r\n
    Densidade<\/td>\r\n2,10 a 2,17<\/td>\r\ngm\/cu.cm<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Coeficiente de Expans\u00e3o Linear<\/td>\r\n7x10-5<\/td>\r\nK-1<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Ponto de fus\u00e3o<\/td>\r\n410 -414\r\n210 - 212<\/td>\r\ndeg F\r\ndeg C<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Condutividade t\u00e9rmica<\/td>\r\n1.45\r\n0.84<\/td>\r\nBtu\u00b7in\/h\u00b7ft2\u00b7\u00b0F\r\nW\/m\u00b7K<\/td>\r\nASTM C177<\/td>\r\n<\/tr>\r\n
    Calor espec\u00edfico<\/td>\r\n0.22\r\n0.92<\/td>\r\nBtu\/lb\/deg F\r\nkJ\/Kg\/deg K<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Temperatura de distor\u00e7\u00e3o de calor, 66 lb\/sq.in (0,455 MPa)<\/td>\r\n259\r\n126<\/td>\r\ndeg F\r\ndeg C<\/td>\r\nD 648<\/td>\r\n<\/tr>\r\n
    Temperatura de processamento<\/td>\r\n620\r\n327<\/td>\r\ndeg F\r\ndeg C<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Resist\u00eancia diel\u00e9trica, curto espa\u00e7o de tempo, 0,004\u201d<\/td>\r\n3000<\/td>\r\nVolt\/mil<\/td>\r\nD 149<\/td>\r\n<\/tr>\r\n
    Resist\u00eancia ao Arco<\/td>\r\n360<\/td>\r\nsegundo<\/td>\r\nD 495<\/td>\r\n<\/tr>\r\n
    Resistividade de volume, @ 50% RH<\/td>\r\n2x1017<\/td>\r\nohm-cm<\/td>\r\nD 257<\/td>\r\n<\/tr>\r\n
    Resistividade de superf\u00edcie, @ 100% RH<\/td>\r\n1x1015<\/td>\r\nOhm quadrado-1<\/td>\r\nD 257<\/td>\r\n<\/tr>\r\n
    Constante diel\u00e9trica, 1 kHz<\/td>\r\n2.6<\/td>\r\n\u03b5<\/td>\r\nD150-81<\/td>\r\n<\/tr>\r\n
    Fator de Dissipa\u00e7\u00e3o, @ 1 kHz<\/td>\r\n0.02<\/td>\r\n<\/td>\r\nD150-81<\/td>\r\n<\/tr>\r\n
    Absor\u00e7\u00e3o de \u00e1gua<\/td>\r\n0.00<\/td>\r\nAumento de peso %<\/td>\r\nD570-81<\/td>\r\n<\/tr>\r\n
    Classifica\u00e7\u00e3o de Chama+<\/td>\r\nN\u00e3o inflam\u00e1vel<\/td>\r\n<\/td>\r\nD 635<\/td>\r\n<\/tr>\r\n
    Coeficiente de fric\u00e7\u00e3o<\/td>\r\n<\/td>\r\n<\/td>\r\nD 1894<\/td>\r\n<\/tr>\r\n
    Gravidade Espec\u00edfica<\/td>\r\n2,10 a 2,17<\/td>\r\n<\/td>\r\nD792<\/td>\r\n<\/tr>\r\n
    Constante de permeabilidade \u00e0 umidade<\/td>\r\n0.2<\/td>\r\ng\/m2, 24 horas<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Permeabilidade ao O2<\/td>\r\n1,5 x 10-10<\/td>\r\nCc, cm\/cm\u00b2, seg, atm<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Permeabilidade ao N2<\/td>\r\n0,18x10-10<\/td>\r\nCc, cm\/cm\u00b2, seg, atm<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    Permeabilidade ao CO2<\/td>\r\n2,9x10-10<\/td>\r\nCc, cm\/cm\u00b2, seg, atm<\/td>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n

    Assento de v\u00e1lvula PCTFE<\/h2>\r\n\r\n\r\n\r\n\r\nAs sedes das v\u00e1lvulas esf\u00e9ricas que mostram sinais de incha\u00e7o, forma\u00e7\u00e3o de bolhas ou \u201cpipocas\u201d foram permeadas em n\u00edvel molecular. Escusado ser\u00e1 dizer que isso pode causar alguns problemas s\u00e9rios, como vazamentos e falhas catastr\u00f3ficas. A solu\u00e7\u00e3o \u00e9 encontrar um material de sede de v\u00e1lvula esfera que seja altamente resistente \u00e0 permea\u00e7\u00e3o e uma excelente escolha seria o PCTFE. Na postagem do blog desta semana, falaremos sobre sedes de v\u00e1lvula esf\u00e9rica PCTFE e como elas s\u00e3o usadas em aplica\u00e7\u00f5es de baixa permea\u00e7\u00e3o.\r\n\r\n\r\n\r\n\r\n\r\nUm dos melhores materiais para uma aplica\u00e7\u00e3o de sede de v\u00e1lvula esfera onde a permeabilidade \u00e9 um problema seria o PCTFE (policlorotrifluoroetileno), um clorofluoropol\u00edmero termopl\u00e1stico. O PCTFE \u00e9 \u00e0s vezes referido como PTFE modificado ou PCTFE, bem como pelos nomes comerciais Kel-F, Voltalef e Neoflon. O PCTFE \u00e9 frequentemente considerado um material de PTFE de segunda gera\u00e7\u00e3o que mant\u00e9m a resist\u00eancia qu\u00edmica e t\u00e9rmica do PTFE juntamente com seu baixo atrito. Tamb\u00e9m \u00e9 semelhante a outros fluoropol\u00edmeros, como PFA ou FEP.\r\n\r\n\r\n\r\n\r\n\r\nUma das caracter\u00edsticas definidoras do PCTFE \u00e9 que ele possui uma estrutura molecular muito mais densa e um baixo teor de vazios e microporosidade quando comparado a materiais semelhantes de sede de v\u00e1lvula esf\u00e9rica. Isso lhe confere um coeficiente de permeabilidade muito baixo, o que significa que a probabilidade de inchar ou estourar \u00e9 muito menor do que outros materiais. Por exemplo, sua permeabilidade para O2, N2, CO2 e H2 \u00e9 1,5 x 10-10, 0,18 x 10-10, 2,9 x 10-10 e 56,4 x 10-10 darcy, respectivamente.\r\n\r\n\r\n\r\n\r\n\r\nO PCTFE tamb\u00e9m proporciona maior tenacidade e resist\u00eancia, juntamente com boa recupera\u00e7\u00e3o de deforma\u00e7\u00e3o e excelente resist\u00eancia \u00e0 flu\u00eancia e ao fluxo a frio. Al\u00e9m disso, possui uma ampla faixa de temperatura operacional de -100\u00b0F a 500\u00b0F. Na verdade, funciona extremamente bem em temperaturas criog\u00eanicas. Devido ao seu baixo atrito, tamb\u00e9m resulta em um torque operacional muito baixo da v\u00e1lvula esf\u00e9rica. O PCTFE tamb\u00e9m apresenta absor\u00e7\u00e3o zero de umidade e n\u00e3o molha.\r\n\r\n\r\n\r\n\r\n\r\nO PCTFE funciona bem em ambientes operacionais onde outros pol\u00edmeros podem falhar. Por exemplo, est\u00e1 bem adaptado ao servi\u00e7o nuclear que pode envolver elevada exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o, n\u00e3o \u00e9 inflam\u00e1vel (D 635) e \u00e9 resistente ao ataque da grande maioria dos produtos qu\u00edmicos e agentes oxidantes. Os \u00fanicos produtos qu\u00edmicos que podem causar um ligeiro incha\u00e7o s\u00e3o \u00e9teres, \u00e9steres, solventes arom\u00e1ticos e compostos de halocarbonetos.\r\n\r\n","link":"https:\/\/zecovalve.com\/pt\/tag\/pctfe-valve-seat","name":"Assento de v\u00e1lvula PCTFE","slug":"pctfe-valve-seat","taxonomy":"post_tag","meta":[],"yoast_head":"\nPCTFE Valve Seat - PCTFE Material | 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\/pctfe-valve-seat\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PCTFE Valve Seat - PCTFE Material | ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"GET PCTFE VALVE SEAT PRICE What is PCTFE Material? PCTFE (Polychlorotrifluoroethylene) PCTFE (Polychlorotrifluoroethylene) is a homopolymer of Chlorotrifluoroethylene. PCTFE is a unique fluoropolymer that is capable of maintaining its physical properties at exceptionally low operating temperatures. PCTFE has excellent chemical resistance, radiation resistance, and flammability characteristics. The material has a useful temperature range of -400\u00b0F to 380\u00b0F. PCTFE is resistant to cold flow and it has the lowest coefficient of thermal expansion of any unfilled fluoropolymer. These characteristics make it an excellent choice when dimensional stability is critical. PCTFE is often used for aerospace applications when chemical resistance, a broad operating temperature range, and low flammability are required. It is also extensively used for cryogenic valve applications. Key Properties of PCTFE Material Dimensionally stable, rigid, and resistant to cold flow Very low gas permeation and outgassing Near zero moisture absorption Excellent chemical resistance High compression strength Low deformation under load Non-flammable Temperature range: -400\u00b0 to 380\u00b0F Radiation Resistance Property Value Units Method Tensile Strength 4860 – 5710 34 – 39 psi MPa D 638 Elongation 100 – 250 % D 638 Flexural Strength, 73\u00b0F 9570 – 10300 66 – 71 psi MPa Flex Modulus 200 \u2013 243 x 103 1.4 \u2013 1.7 psi MPa Impact Strength, Izod, 23 deg C 2.5 \u2013 3.5 ft-lb\/in D 256 Compressive Stress at 1% deformation, 1570 \u2013 1860 11 – 13 psi MPa D 695 Density 2.10 to 2.17 gm\/cu.cm Coefficient of Linear Expansion 7 x 10-5 K-1 Melting Point 410 -414 210 – 212 deg F deg C Thermal Conductivity 1.45 0.84 Btu\u00b7in\/h\u00b7ft2\u00b7\u00b0F W\/m\u00b7K ASTM C 177 Specific Heat 0.22 0.92 Btu\/lb\/deg F kJ\/Kg\/deg K Heat Distortion Temperature, 66 lb\/sq.in (0.455 MPa) 259 126 deg F deg C D 648 Processing Temperature 620 327 deg F deg C Dielectric Strength, short time, 0.004\u201d 3000 Volt\/mil D 149 Arc-Resistance 360 sec D 495 Volume Resistivity, @ 50% RH 2 x 1017 ohm-cm D 257 Surface Resistivity, @ 100% RH 1 x 1015 Ohm sq-1 D 257 Dielectric Constant, 1 kHz 2.6 \u03b5 D150-81 Dissipation Factor, @ 1 kHz 0.02 D150-81 Water Absorption 0.00 % increase in weight D570-81 Flame Rating+ Non-flammable D 635 Coefficient of friction D 1894 Specific Gravity 2.10 to 2.17 D792 Moisture Permeability Constant 0.2 g\/m, 24 hours O2\u00a0Permeability 1.5 x 10-10 Cc, cm\/sq.cm, sec, atm N2\u00a0Permeability 0.18 x 10-10 Cc, cm\/sq.cm, sec, atm CO2\u00a0Permeability 2.9 x 10-10 Cc, cm\/sq.cm, sec, atm PCTFE Valve Seat Ball valve seats that show signs of swelling, blistering, or \u201cpopcorning\u201d have been permeated at a molecular level. Needless to say, this can cause some serious issues such as leaks and catastrophic failure. The solution is to find a ball valve seat material that is highly resistant to permeation and an excellent choice would be PCTFE. In this week\u2019s blog post, we will talk about PCTFE Ball Valve Seats and how they are used in Low Permeation Applications. One of the best materials for a ball valve seat application where permeability is a problem would be PCTFE (Polychlorotrifluoroethylene), a thermoplastic chlorofluoropolymer. PCTFE is sometimes referred to as Modified PTFE or PCTFE, as well as by trade names Kel-F, Voltalef, and Neoflon. PCTFE is often thought of as a second-generation PTFE material that maintains the chemical and thermal resistance of PTFE along with its low friction. It is also similar to other fluoropolymers such as PFA or FEP. One of the defining characteristics of PCTFE is that it has a much more dense molecular structure and a low void and micro-porosity content when compared to similar ball valve seat materials. This gives it a very low permeability coefficient, which means that the likelihood of it swelling or popcorning is far lower than other materials. For example, its permeability for O2, N2, CO2, and H2 are 1.5 x 10-10, 0.18 x 10-10, 2.9 x 10-10, and 56.4 x 10-10 darcy, respectively. PCTFE also provides improved toughness and strength along with good deformation recovery and excellent creep and cold-flow resistance. In addition, it has a wide operating temperature range of -100\u00b0F to 500\u00b0F. In fact, it performs extremely well at cryogenic temperatures. Because of its low friction, it also results in a very low ball valve operating torque. PCTFE also exhibits zero moisture absorption and is non-wetting. PCTFE works well in operating environments where other polymers may fail. For example, it is well adapted to nuclear service that may involve high radiation exposure, is non-flammable (D 635), and is resistant to attack by the vast majority of chemicals and oxidizing agents. The only chemicals that might lead to slight swelling are ethers, esters, aromatic solvents, and halocarbon compounds.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zecovalve.com\/pt\/tag\/pctfe-valve-seat\" \/>\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\/pctfe-valve-seat#webpage\",\"url\":\"https:\/\/zecovalve.com\/tag\/pctfe-valve-seat\",\"name\":\"PCTFE Valve Seat - PCTFE Material | ZECO Valve\",\"isPartOf\":{\"@id\":\"https:\/\/zecovalve.com\/#website\"},\"breadcrumb\":{\"@id\":\"https:\/\/zecovalve.com\/tag\/pctfe-valve-seat#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/zecovalve.com\/tag\/pctfe-valve-seat\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/zecovalve.com\/tag\/pctfe-valve-seat#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\/pctfe-valve-seat\",\"url\":\"https:\/\/zecovalve.com\/tag\/pctfe-valve-seat\",\"name\":\"PCTFE Valve Seat\"}}]}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","_links":{"self":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags\/1997","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=1997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}