{"id":11720,"date":"2022-01-04T12:36:11","date_gmt":"2022-01-04T12:36:11","guid":{"rendered":"https:\/\/zecovalve.com\/introduction-of-epdm-nbr-butterfly-valve-seat-industrial-valve-information-news-zeco-valve.html"},"modified":"2022-10-17T06:11:26","modified_gmt":"2022-10-17T06:11:26","slug":"introduction-of-epdm-nbr-butterfly-valve-seat-industrial-valve-information-news-zeco-valve","status":"publish","type":"post","link":"https:\/\/zecovalve.com\/pt\/introduction-of-epdm-nbr-butterfly-valve-seat-industrial-valve-information-news-zeco-valve.html","title":{"rendered":"Introdu\u00e7\u00e3o da sede da v\u00e1lvula borboleta EPDM e NBR"},"content":{"rendered":"<p>As v\u00e1lvulas borboleta ZECO s\u00e3o geralmente classificadas como borboleta CI, borboleta WCB, borboleta bronze e borboleta de a\u00e7o inoxid\u00e1vel. As v\u00e1lvulas borboleta est\u00e3o dispon\u00edveis em tamanhos de 2 a 8 polegadas, geralmente usando opera\u00e7\u00e3o por alavanca. Acima das v\u00e1lvulas borboleta de 8 polegadas, o torque na sede de borracha aumenta geralmente come\u00e7ando com opera\u00e7\u00e3o turbo, pneum\u00e1tica ou el\u00e9trica.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-a-butterfly-valve-seat\">O que \u00e9 uma <a href=\"https:\/\/zecovalve.com\/pt\/categoria-do-produto\/butterfly-valve\/concentric-butterfly-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\"><mark style=\"background-color:var(--base)\" class=\"has-inline-color has-contrast-2-color\">v\u00e1lvula de borboleta<\/mark><\/a> assento?<\/h2>\n\n\n\n<p>A sede da v\u00e1lvula borboleta \u00e9 onde as partes m\u00f3veis da v\u00e1lvula repousam quando na posi\u00e7\u00e3o fechada. Em aplica\u00e7\u00f5es de v\u00e1lvula borboleta, o disco assenta firmemente na sede para fechar e vedar a v\u00e1lvula. A sede \u00e9 projetada para manter a integridade da veda\u00e7\u00e3o sob calor, fric\u00e7\u00e3o e press\u00e3o de choque do processo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">As sedes das v\u00e1lvulas podem ser substitu\u00eddas?<\/h2>\n\n\n\n<p>As sedes da v\u00e1lvula borboleta podem ser produzidas como sedes substitu\u00edveis, a veda\u00e7\u00e3o da sede original \u00e9 afetada por danos, a sede original ser\u00e1 removida, substitu\u00edda por uma nova sede pode continuar a ser usada, mas a vulcaniza\u00e7\u00e3o da sede no corpo da v\u00e1lvula n\u00e3o \u00e9 substitu\u00edvel<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Guia de sele\u00e7\u00e3o de sede de v\u00e1lvula borboleta<\/h2>\n\n\n\n<p>O meio aplic\u00e1vel da v\u00e1lvula borboleta com sede de borracha \u00e9 diferente de acordo com os diferentes materiais de borracha. Os materiais comuns de sede de v\u00e1lvula de borracha incluem borracha EPDM, borracha nitr\u00edlica (NBR) e PTFE.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">O que \u00e9 assento EPDM?<\/h3>\n\n\n\n<p>Borracha EPDM: EPDM \u00e9 a abreviatura de Mon\u00f4mero de Etileno Propileno Dieno. Comparada com outras borrachas em geral, a borracha EPDM \u00e9 muito econ\u00f4mica. O material EPDM \u00e9 resistente ao envelhecimento, exposi\u00e7\u00e3o solar, resist\u00eancia ao calor, resist\u00eancia \u00e0 umidade e resist\u00eancia \u00e0 radia\u00e7\u00e3o. Tem bom desempenho de isolamento. Faixa de temperatura aplic\u00e1vel -20-120\u00b0C<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Para que \u00e9 usado o EPDM?<\/h3>\n\n\n\n<p>A v\u00e1lvula borboleta EPDM \u00e9 adequada para \u00e1gua e vapor com \u00e1cido fraco e \u00e1lcali fraco.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">O que \u00e9 assento NBR? O que \u00e9 o assento Buna-N?<\/h3>\n\n\n\n<p>Buna N \u00e9 igual a NBR ou Nitrila. NBR \u00e9 a abreviatura de Borracha de Nitrila-Butadieno, este material \u00e9 resistente ao \u00f3leo e \u00e0 abras\u00e3o e possui boa resist\u00eancia \u00e0 \u00e1gua, estanqueidade ao ar e excelentes propriedades de liga\u00e7\u00e3o. \u00c9 amplamente utilizado em oleodutos. As desvantagens s\u00e3o baixa resist\u00eancia \u00e0 temperatura, resist\u00eancia ao oz\u00f4nio, baixo desempenho de isolamento e elasticidade geral. A faixa de temperatura aplic\u00e1vel da borracha nitr\u00edlica \u00e9 de 0-80\u00b0C.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Para que \u00e9 usado o NBR?<\/h3>\n\n\n\n<p>A v\u00e1lvula borboleta NBR \u00e9 mais resistente ao \u00f3leo do que EPDM e atende \u00e0 maioria dos servi\u00e7os de latic\u00ednios, alimentos e processamento sanit\u00e1rio.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">O que \u00e9 assento de PTFE?<\/h3>\n\n\n\n<p>PTFE \u00e9 uma abreviatura do termo politetrafluoroetileno, frequentemente referido como Teflon. Este fluoropol\u00edmero termopl\u00e1stico possui baixo atrito, resist\u00eancia qu\u00edmica e resist\u00eancia ao fogo. O Teflon \u00e9 usado na fabrica\u00e7\u00e3o de v\u00e1lvulas borboleta com sede resiliente.<\/p>\n\n\n\n<p>O PTFE \u00e9 um material econ\u00f4mico em aplica\u00e7\u00f5es como processamento qu\u00edmico ou petr\u00f3leo e g\u00e1s. Devido \u00e0s suas qualidades isolantes, \u00e9 compat\u00edvel com aplica\u00e7\u00f5es el\u00e9tricas. No entanto, n\u00e3o deve ser utilizado em condi\u00e7\u00f5es de alta press\u00e3o. O PTFE tem uma faixa de temperatura nominal de -50\u00b0F a 400\u00b0F.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Para que \u00e9 usado o PTFE?<\/h3>\n\n\n\n<p>A v\u00e1lvula borboleta PTFE \u00e9 usada para controle de fluxo em ambientes corrosivos, como transfer\u00eancia de \u00e1cidos, alcalinos e outros corrosivos, f\u00e1bricas de processamento de alimentos e produtos qu\u00edmicos em f\u00e1bricas de processos qu\u00edmicos. Al\u00e9m disso, a v\u00e1lvula borboleta PTFE tamb\u00e9m \u00e9 usada em plantas petroqu\u00edmicas e outras ind\u00fastrias, como fertilizantes, pesticidas, f\u00e1bricas de processamento de celulose e papel e corantes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Buna N VS EPDM, qual a diferen\u00e7a entre EPDM e NBR?<\/h3>\n\n\n\n<p>EPDM \u00e9 resistente a \u00e1lcalis, \u00e1cidos e cetonas. O EPDM n\u00e3o \u00e9 adequado para aplica\u00e7\u00f5es que envolvam combust\u00edveis \u00e0 base de petr\u00f3leo, petr\u00f3leo e solventes n\u00e3o polares, mas o BUNA \u00e9.<\/p>\n\n\n\n<p>Embora tanto o EPDM quanto o BUNA sejam resistentes \u00e0 abras\u00e3o e ao rasgo, o EPDM \u00e9 mais resistente a altas temperaturas do que o BUNA. Ao comparar o EPDM com o BUNA, o EPDM \u00e9 mais adequado para aplica\u00e7\u00f5es externas, pois pode suportar os elementos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PTFE VS EPDM, qual \u00e9 melhor EPDM ou PTFE?<\/h3>\n\n\n\n<p>EPDM \u00e9 um mon\u00f4mero, enquanto PFTE (Teflon) \u00e9 um fluoropol\u00edmero. Ao comparar EPDM com PFTE, a toler\u00e2ncia \u00e0 temperatura e a flexibilidade s\u00e3o as principais diferen\u00e7as. O PTFE pode suportar uma ampla gama de temperaturas extremas de frio e calor.<\/p>\n\n\n\n<p>EPDM \u00e9 uma borracha resistente a rasgos que pode suportar movimentos repetitivos, enquanto PFTE n\u00e3o \u00e9 flex\u00edvel. O PFTE \u00e9 ideal para processos petrol\u00edferos, enquanto o EPDM \u00e9 adequado para aplica\u00e7\u00f5es HVAC.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-large\"><img decoding=\"async\" src=\"https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/01\/20220104123610-61d43f3a1cb57.webp\" alt=\"\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/01\/20220104123610-61d43f3a14ade.webp\" alt=\"\"\/><\/figure>\n\n\n\n<!-- Andy:h-related-tags -->\n<h2 id=\"h-related-tags\">Etiquetas relacionadas :<\/h2>\n<!-- \/Andy:h-related-tags -->\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/\">V\u00e1lvula ZECO<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/difference-between-gate-valves-and-ball-valves.html\/\">V\u00e1lvula de gaveta vs V\u00e1lvula de esfera<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/advantages-and-disadvantages-of-globe-valves.html\/\">O que \u00e9 uma v\u00e1lvula de globo?<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/gate-valve-problems.html\/\">Reparo de v\u00e1lvula gaveta<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/what-is-an-axial-flow-silent-check-valve.html\/\">O que \u00e9 uma v\u00e1lvula de reten\u00e7\u00e3o axial<\/a>\n\n<\/div>\n\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/produto\/manual-gate-valve\/\">V\u00e1lvula de gaveta de acionamento manual Fabricante<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/pt\/the-function-of-globe-valve-in-pipeline-system.html\/\">O que s\u00e3o v\u00e1lvulas globo?<\/a>\n\n<\/div>\n\n\n<p><\/p>\n<p><!-- wam:article --><\/p>\n<p>Dez artigos antes e depois<\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/introduction-of-vulcanized-seat-butterfly-valve-industrial-valve-information-news-zeco-valve.html\/\">Introdu\u00e7\u00e3o de v\u00e1lvula borboleta de sede vulcanizada \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/wafer-butterfly-valve-installation-industrial-valve-information-news-zeco-valve.html\/\">Instala\u00e7\u00e3o de v\u00e1lvula borboleta Wafer \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/introducion-of-lug-butterfly-valve-industrial-valve-information-news-zeco-valve.html\/\">Introdu\u00e7\u00e3o da v\u00e1lvula borboleta Lug \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/the-advantage-of-butterfly-valves-industrial-valve-information-news-zeco-valve.html\/\">A vantagem das v\u00e1lvulas borboleta \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 Zeco Valve<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/patented-products-lug-butterfly-valve-introduction-industrial-valve-information-news-zeco-valve.html\/\">Produtos patenteados Introdu\u00e7\u00e3o \u00e0 v\u00e1lvula borboleta LUG \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/ul-fm-certificate-industry-news-news-zeco-valve.html\/\">Certificado UL e FM \u2013 Not\u00edcias da Ind\u00fastria \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/lug-butterfly-valve-brief-introduction-industrial-valve-information-news-zeco-valve.html\/\">Breve introdu\u00e7\u00e3o \u00e0 v\u00e1lvula borboleta Lug \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/butterfly-valve-exporting-volume-keep-increasing-industry-news-news-zeco-valve.html\/\">O volume de exporta\u00e7\u00e3o de v\u00e1lvulas borboleta continua aumentando \u2013 Not\u00edcias do setor \u2013 Not\u00edcias \u2013 Zeco Valve<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/butterfly-valve-leakage-reasons-and-solutions-industrial-valve-information-news-zeco-valve.html\/\">Raz\u00f5es e solu\u00e7\u00f5es para vazamento de v\u00e1lvula borboleta \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 V\u00e1lvula Zeco<\/a><\/p>\n<p><a href=\"https:\/\/zecovalve.com\/pt\/what-you-should-know-about-butterfly-valve-industrial-valve-information-news-zeco-valve.html\/\">O que voc\u00ea deve saber sobre v\u00e1lvula borboleta \u2013 Informa\u00e7\u00f5es sobre v\u00e1lvulas industriais \u2013 Not\u00edcias \u2013 Zeco Valve<\/a><\/p>\n<p><!-- \/wam:article --><\/p>","protected":false},"excerpt":{"rendered":"<p>As v\u00e1lvulas borboleta ZECO s\u00e3o geralmente classificadas como borboleta CI, borboleta WCB, borboleta bronze e borboleta de a\u00e7o inoxid\u00e1vel. As v\u00e1lvulas borboleta est\u00e3o dispon\u00edveis em\u2026 <a title=\"Introdu\u00e7\u00e3o da sede da v\u00e1lvula borboleta EPDM e NBR\" class=\"read-more\" href=\"https:\/\/zecovalve.com\/pt\/introduction-of-epdm-nbr-butterfly-valve-seat-industrial-valve-information-news-zeco-valve.html\" aria-label=\"Mais em Introdu\u00e7\u00e3o \u00e0 sede da v\u00e1lvula borboleta EPDM e NBR\">Ler mais<\/a><\/p>","protected":false},"author":2,"featured_media":11718,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[1],"tags":[1814,1821,1819,1818,1820,1816,1815,1817,1997,1998,3235],"class_list":["post-11720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-butterfly-valve-seat","tag-epdm-butterfly-valve","tag-epdm-seat","tag-epdm-valve","tag-epdm-vs-nbr","tag-epdm-vs-nitrile","tag-epdm-vs-ptfe","tag-nbr-vs-epdm","tag-pctfe-valve-seat","tag-pctfe-valve-seat-manufacturer","tag-valve-seat-rings","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":["https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/01\/20220104123610-61d43f3a14ade.webp",495,409,false],"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/pt\/author\/jerry"},"comment_info":0,"category_info":[{"term_id":1,"name":"Uncategorized","slug":"uncategorized","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":452,"filter":"raw","cat_ID":1,"category_count":452,"category_description":"","cat_name":"Uncategorized","category_nicename":"uncategorized","category_parent":0}],"tag_info":[{"term_id":1814,"name":"butterfly valve seat","slug":"butterfly-valve-seat","term_group":0,"term_taxonomy_id":1814,"taxonomy":"post_tag","description":"","parent":0,"count":2,"filter":"raw"},{"term_id":1821,"name":"epdm butterfly valve","slug":"epdm-butterfly-valve","term_group":0,"term_taxonomy_id":1821,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1819,"name":"epdm seat","slug":"epdm-seat","term_group":0,"term_taxonomy_id":1819,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1818,"name":"epdm valve","slug":"epdm-valve","term_group":0,"term_taxonomy_id":1818,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1820,"name":"epdm vs nbr","slug":"epdm-vs-nbr","term_group":0,"term_taxonomy_id":1820,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1816,"name":"epdm vs nitrile","slug":"epdm-vs-nitrile","term_group":0,"term_taxonomy_id":1816,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1815,"name":"epdm vs ptfe","slug":"epdm-vs-ptfe","term_group":0,"term_taxonomy_id":1815,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1817,"name":"nbr vs epdm","slug":"nbr-vs-epdm","term_group":0,"term_taxonomy_id":1817,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1997,"name":"PCTFE Valve Seat","slug":"pctfe-valve-seat","term_group":0,"term_taxonomy_id":1997,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_9e7b7b-8a\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET PCTFE VALVE SEAT PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-pctfe-material\">What is PCTFE Material?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE (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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE 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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE 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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Key Properties of PCTFE Material<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>Dimensionally stable, rigid, and resistant to cold flow<\/li>\r\n \t<li>Very low gas permeation and outgassing<\/li>\r\n \t<li>Near zero moisture absorption<\/li>\r\n \t<li>Excellent chemical resistance<\/li>\r\n \t<li>High compression strength<\/li>\r\n \t<li>Low deformation under load<\/li>\r\n \t<li>Non-flammable<\/li>\r\n \t<li>Temperature range: -400\u00b0 to 380\u00b0F<\/li>\r\n \t<li>Radiation Resistance<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td>Property<\/td>\r\n<td>Value<\/td>\r\n<td>Units<\/td>\r\n<td>Method<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Tensile Strength<\/td>\r\n<td>4860 - 5710\r\n34 - 39<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td>D 638<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Elongation<\/td>\r\n<td>100 - 250<\/td>\r\n<td>%<\/td>\r\n<td>D 638<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flexural Strength, 73\u00b0F<\/td>\r\n<td>9570 - 10300\r\n66 - 71<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flex Modulus<\/td>\r\n<td>200 \u2013 243 x 103\r\n1.4 \u2013 1.7<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Impact Strength, Izod, 23 deg C<\/td>\r\n<td>2.5 \u2013 3.5<\/td>\r\n<td>ft-lb\/in<\/td>\r\n<td>D 256<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Compressive Stress at 1% deformation,<\/td>\r\n<td>1570 \u2013 1860\r\n11 - 13<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td>D 695<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Density<\/td>\r\n<td>2.10 to 2.17<\/td>\r\n<td>gm\/cu.cm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Coefficient of Linear Expansion<\/td>\r\n<td>7 x 10-5<\/td>\r\n<td>K-1<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Melting Point<\/td>\r\n<td>410 -414\r\n210 - 212<\/td>\r\n<td>deg F\r\ndeg C<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Thermal Conductivity<\/td>\r\n<td>1.45\r\n0.84<\/td>\r\n<td>Btu\u00b7in\/h\u00b7ft2\u00b7\u00b0F\r\nW\/m\u00b7K<\/td>\r\n<td>ASTM C 177<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Specific Heat<\/td>\r\n<td>0.22\r\n0.92<\/td>\r\n<td>Btu\/lb\/deg F\r\nkJ\/Kg\/deg K<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Heat Distortion Temperature, 66 lb\/sq.in (0.455 MPa)<\/td>\r\n<td>259\r\n126<\/td>\r\n<td>deg F\r\ndeg C<\/td>\r\n<td>D 648<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Processing Temperature<\/td>\r\n<td>620\r\n327<\/td>\r\n<td>deg F\r\ndeg C<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Dielectric Strength, short time, 0.004\u201d<\/td>\r\n<td>3000<\/td>\r\n<td>Volt\/mil<\/td>\r\n<td>D 149<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Arc-Resistance<\/td>\r\n<td>360<\/td>\r\n<td>sec<\/td>\r\n<td>D 495<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Volume Resistivity, @ 50% RH<\/td>\r\n<td>2 x 1017<\/td>\r\n<td>ohm-cm<\/td>\r\n<td>D 257<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Surface Resistivity, @ 100% RH<\/td>\r\n<td>1 x 1015<\/td>\r\n<td>Ohm sq-1<\/td>\r\n<td>D 257<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Dielectric Constant, 1 kHz<\/td>\r\n<td>2.6<\/td>\r\n<td>\u03b5<\/td>\r\n<td>D150-81<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Dissipation Factor, @ 1 kHz<\/td>\r\n<td>0.02<\/td>\r\n<td><\/td>\r\n<td>D150-81<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Water Absorption<\/td>\r\n<td>0.00<\/td>\r\n<td>% increase in weight<\/td>\r\n<td>D570-81<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flame Rating+<\/td>\r\n<td>Non-flammable<\/td>\r\n<td><\/td>\r\n<td>D 635<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Coefficient of friction<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>D 1894<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Specific Gravity<\/td>\r\n<td>2.10 to 2.17<\/td>\r\n<td><\/td>\r\n<td>D792<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Moisture Permeability Constant<\/td>\r\n<td>0.2<\/td>\r\n<td>g\/m, 24 hours<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>O2\u00a0Permeability<\/td>\r\n<td>1.5 x 10-10<\/td>\r\n<td>Cc, cm\/sq.cm, sec, atm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>N2\u00a0Permeability<\/td>\r\n<td>0.18 x 10-10<\/td>\r\n<td>Cc, cm\/sq.cm, sec, atm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>CO2\u00a0Permeability<\/td>\r\n<td>2.9 x 10-10<\/td>\r\n<td>Cc, cm\/sq.cm, sec, atm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->\r\n\r\n<!-- wp:heading -->\r\n<h2>PCTFE Valve Seat<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nBall 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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOne 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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOne 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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE 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.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE 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.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":4,"filter":"raw"},{"term_id":1998,"name":"PCTFE Valve Seat Manufacturer","slug":"pctfe-valve-seat-manufacturer","term_group":0,"term_taxonomy_id":1998,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_7bd7e9-a7\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET PCTFE VALVE SEAT PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-pctfe\">What is PCTFE?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE(Polychlorotrifluoroethylene) is a fluorocarbon-based polymer. It offers a unique combination of physical and mechanical properties, nonflammability, and low permeation capability to moisture and steam atmosphere compared to other plastics. The heat resistance and chemical resistance capability are less than PFA and FEP, however, mechanical characteristics(especially hardness) are superior. It is suitable for utilizing in the temperature range of -200\u2103\uff5e150\u2103, especially for cryogenic applications such as oxygen, hydrogen, nitrogen, and more. PCTFE has a very strong resistance performance to low temperatures.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Property List of PCTFE<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Item<\/strong><\/td>\r\n<td><strong>Color<\/strong><\/td>\r\n<td><strong>Density<\/strong><\/td>\r\n<td><strong>Hardness<\/strong><\/td>\r\n<td><strong>Compressive strength<\/strong><\/td>\r\n<td><strong>Long-term Temp.<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Units<\/td>\r\n<td><\/td>\r\n<td>g\/cm3<\/td>\r\n<td>Shore D<\/td>\r\n<td>Mpa<\/td>\r\n<td>\u2103<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Value<\/td>\r\n<td>Translucent<\/td>\r\n<td>2.13<\/td>\r\n<td>75-85<\/td>\r\n<td>80<\/td>\r\n<td>-80~115<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->\r\n\r\n<!-- wp:heading -->\r\n<h2><strong><a href=\"https:\/\/zecovalve.com\/product-category\/ball-valve\"><mark class=\"has-inline-color has-contrast-2-color\" style=\"background-color: var(--base)\">Ball Valve<\/mark><\/a><\/strong> Seats<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSeats and inserts, which are important components in the valve industry, are critical components, PTFE is very often chosen as the raw material. PTFE provides a low-friction seat, with excellent media compatibility. Filled grades provide wear resistance and can support seating loads of the higher class of valves.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2><strong><mark class=\"has-inline-color has-contrast-2-color\" style=\"background-color: var(--base)\"><a href=\"https:\/\/zecovalve.com\/product-category\/butterfly-valve\">Butterfly Valve<\/a><\/mark><\/strong> Seats<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPTFE is one of the Butterfly Valve Seat Materials. PTFE Butterfly Valve Seats Are Available in Pure or Reinforced PTFE to Meet Specific Requirements for Different Working Environments.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPTFE Seats' Excellent Chemical Resistance, High-Temperature Resistance, Self-lubrication, and Low Friction Properties of PTFE Make It a General Material for Valve Seats.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>VALVE SEAT MATERIAL SELECTION<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<th class=\"has-text-align-center\" data-align=\"center\">Material Name<\/th>\r\n<th>Main Properties<\/th>\r\n<th>Notes<\/th>\r\n<th>Temperature Range<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">VIRGIN PTFE<\/td>\r\n<td>Very low coefficient of friction and excellent chemical resistance.<\/td>\r\n<td>FDA approved<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">15% Glass Filled PTFE<\/td>\r\n<td>Decreased compressive strength and lower deformation under load than virgin PTFE.<\/td>\r\n<td>Abrasive material<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">25% Glass Filled PTFE<\/td>\r\n<td>Similar to 15% Glass better wear resistance, higher compressive strength, and lower deformation under load.<\/td>\r\n<td>Abrasive material<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Stainless Steel Filled PTFE<\/td>\r\n<td>Extremely hard-wearing. Excellent strength and stability under extreme loads and elevated temperatures.<\/td>\r\n<td>Can be used in steam and thermal fluid applications<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">TFM<\/td>\r\n<td>Much denser polymer structure than Virgin PTFE. Displays better stress recovery.<\/td>\r\n<td>Modified TFE Polymer<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Carbon Graphite filled TFM<\/td>\r\n<td>Lower thermal expansion-contraction rate than conventional TFM.<\/td>\r\n<td>Ideal for use in steam and thermal fluid applications<\/td>\r\n<td>-40\u00b0C to 260\u00b0C and even 320\u00b0C on Thermal Fluid applications<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">UHMWPE<\/td>\r\n<td>Highly resistant to corrosive chemicals, with the exception of oxidizing acids and organic solvents.<\/td>\r\n<td>Also known as High Modulus Polyethylene (HMPE) or High-Performance Polyethylene (HPPE)<\/td>\r\n<td>-40\u00b0C to +80\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">PCTFE<\/td>\r\n<td>Excellent for cryogenic and Oxygen use.<\/td>\r\n<td>A homo-polymer of Chlorotrifluoroethylene<\/td>\r\n<td>-270\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Virgin PEEK 450G<\/td>\r\n<td>Excellent chemical resistance and mechanical properties at elevated temperatures.<\/td>\r\n<td>An organic polymer thermoplastic<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Carbon Filled PEEK<\/td>\r\n<td>Many similar properties to Virgin PEEK. Particularly suitable for elevated temperatures and high-load situations.<\/td>\r\n<td>Low coefficient of friction and suitable for many extremely corrosive applications<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">PEEK HT<\/td>\r\n<td>Retains all key features and benefits of PEEK 450G but retains physical properties to a higher temperature.<\/td>\r\n<td>Can be supplied in both virgins unfilled or as-filled compounded material<\/td>\r\n<td>up to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Acetal and Delrin<\/td>\r\n<td>Displays good resistance to wear and deformation under load.<\/td>\r\n<td>Excellent for valve seat applications<\/td>\r\n<td>up to 80\u00b0C<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->","parent":0,"count":5,"filter":"raw"},{"term_id":3235,"name":"Valve Seat Rings","slug":"valve-seat-rings","term_group":0,"term_taxonomy_id":3235,"taxonomy":"post_tag","description":"<!-- wp:paragraph -->\r\n\r\nThe Valve seat or seat ring is used to support the valve plug or disc in a fully closed position and to form a sealing part. Usually, the valve seat diameter is the maximum flow diameter of the valve. The seat material is very wide, all kinds of rubber, plastic, and metal materials can be used as seat material, such as EPDM, NBR, NR, PTF.E, PEEK, PFA, SS315, STELLITE, and so on\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_6f889b-ad\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET VALVE SEAT RINGS PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor the butterfly valve, the seat material usually are rubbers, such as EPDM, NBR, NR (Natural hard rubber)\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor the ball valve and plug valve the seat material usually is plastics, such as PTFE, PEEK, and so on.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor the globe valve and gate valve the seat material usually is metal to metal.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor valves using soft seat material, their shut-off performance is great and even can reach zero bubble seat tightness. while the disadvantaged part is they can not resist high temperature and high-pressure applications.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOn the other hand, those valve's seat material is metal to metal therefore they can stand with high-pressure ratings up to 2500LB.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-types-of-seat-rings\">Types of Seat Rings<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Soft Seat (Nonmetallic Seat Ring)<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe majority of valves have soft seat inserts and elastomer or polymer seals. The nonmetallic seat ring is made from e.g. Teflon. The ring is held against the ball by an insert. For fire-safe service, a secondary metal-to-metal seating arrangement is required to omit leakage in the event that the soft seat material is lost during a fire. Soft seated valves are recommended for clean service only and are unsuitable for dirty\/abrasive service or high temperatures.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Double Beveled Sealing Ring<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe structure design of a double-beveled sealing ring has been adopted to reduce the friction between the ball and the sealing ring to achieve lower operating torque. When the medium pressure is low, the ball has a smaller contacting surface with a sealing ring, which introduces higher sealing pressure to ensure the sealing reliability. When the medium pressure gets higher, the contacting area between the ball and the sealing ring increases accordingly. A larger contact area reduces the sealing pressure to avoid the deformation of the sealing ring.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Cantilevered lips seat rings<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSeat rings with cantilevered lips are designed so that the ball contacts initially only the tip of the lip. As the upstream and downstream seats are pre-stressed on an assembly against the ball, the lips de\ufb02ect and put the seat rings into a torsion. When the valve is being closed against the line pressure, the lip of the downstream seat de\ufb02ects still further until \ufb01nally the entire seat surface matches the ball. By this design, the seats have some spring action that promotes good sealing action also at low \ufb02uid pressures. Furthermore, the resilient construction keeps the seats from being crushed at high \ufb02uid loads\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Pressure equalizing slots<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe seat ring shown is provided with peripheral slots, which are known as pressure-equalizing slots. During the closing of the valve, the maximum surge pressure occurs, during which the downstream seat can be forced to intrude into the ball port and the valve can become inoperative. The pressure equalizing slots prevents this potential failure. When pressure causes the upstream seat to move against the ball and the ball moves downstream, the pressure simply leaks into the valve body cavity through the relief slots. The upstream seat ring becomes pressure balanced. Downstream sealing prevents seat damage and lowers operating torque while providing full bidirectional capability. The seats with pressure equalizing slots also permit the valve to operate at a higher pressure differential with lower torques than double sealing valves in which there is sealing between both seats and the ball.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Soft Seat (Metallic Seat Ring)<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe metallic seat ring, containing a nonmetallic insert, usually requires spring force to achieve a tight seal. Due to springs, this design is not used in corrosive service. Even though this seat has a metal seat ring, it is categorized as a soft seated ball valve due to its use of soft material insert, which is in contact with the ball.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Metal to Metal Seats<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor services unsuitable for soft seating, metal and ceramic seating are being used. In general practice, hard metal seated ball valves (typically stellite) are only used in severe service conditions such as high temperature, high erosion, corrosion or abrasion, slurry, etc. Metal seats are generally not bubble tight. Metal seats and balls are typically lapped in matching sets resulting in perfect roundness and fitness to ensure smooth operation and tight shut-off and achieving \u2018Zero Leakage\u2019. Metal seats come in different classes of Shut Off including Class IV, V, and VI. Metal Seat and Ball are fabricated from base metals coated with hard chrome, tungsten carbide, and Stellite.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":5,"filter":"raw"}],"taxonomy_info":{"category":[{"value":1,"label":"Uncategorized"}],"post_tag":[{"value":1814,"label":"butterfly valve seat"},{"value":1821,"label":"epdm butterfly valve"},{"value":1819,"label":"epdm seat"},{"value":1818,"label":"epdm valve"},{"value":1820,"label":"epdm vs nbr"},{"value":1816,"label":"epdm vs nitrile"},{"value":1815,"label":"epdm vs ptfe"},{"value":1817,"label":"nbr vs epdm"},{"value":1997,"label":"PCTFE Valve Seat"},{"value":1998,"label":"PCTFE Valve Seat Manufacturer"},{"value":3235,"label":"Valve Seat Rings"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Introduction Of EPDM &amp; NBR Butterfly Valve Seat - 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\/introduction-of-epdm-nbr-butterfly-valve-seat-industrial-valve-information-news-zeco-valve.html\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction Of EPDM &amp; NBR Butterfly Valve Seat - Zeco Valve\" \/>\n<meta property=\"og:description\" content=\"ZECO butterfly valves are usually classified as butterfly CI, butterfly WCB, butterfly bronze, and butterfly stainless steel. 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