{"id":7404,"date":"2024-05-23T15:38:36","date_gmt":"2024-05-23T07:38:36","guid":{"rendered":"https:\/\/www.stvvalves.com\/?p=7404"},"modified":"2024-12-25T12:33:45","modified_gmt":"2024-12-25T04:33:45","slug":"differences-between-double-vs-triple-eccentric-butterfly-valve","status":"publish","type":"post","link":"https:\/\/www.stvvalves.com\/it\/differences-between-double-vs-triple-eccentric-butterfly-valve\/","title":{"rendered":"DIFFERENCES BETWEEN DOUBLE VS. TRIPLE ECCENTRIC BUTTERFLY VALVE"},"content":{"rendered":"<ul>\n<li>Double and triple eccentric butterfly valves are both designed to offer improved performance over traditional concentric butterfly valves, especially in high-pressure and high-temperature applications. The terms \u201cdouble\u201d and \u201ctriple\u201d refer to the number of offsets (eccentricities) in the valve design, which significantly affect how the valve operates and seals. Understanding the differences between these two types of eccentric butterfly valves is crucial for selecting the right valve for specific operational needs.<br \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.stvvalves.com\/it\/differences-between-double-vs-triple-eccentric-butterfly-valve\/#Double_Eccentric_Butterfly_Valves_Double_Offset\" >Double Eccentric Butterfly Valves (Double Offset)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.stvvalves.com\/it\/differences-between-double-vs-triple-eccentric-butterfly-valve\/#Triple_Eccentric_Butterfly_Valves_Triple_Offset\" >Triple Eccentric Butterfly Valves (Triple Offset)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.stvvalves.com\/it\/differences-between-double-vs-triple-eccentric-butterfly-valve\/#Key_Differences_DoubleTriple_Eccentric_Types\" >Key Differences (Double\/Triple Eccentric Types)<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.stvvalves.com\/it\/differences-between-double-vs-triple-eccentric-butterfly-valve\/#MATERIALS_FOR_BUTTERFLY_VALVES\" >MATERIALS FOR BUTTERFLY VALVES<\/a><\/li><\/ul><\/nav><\/div>\n<h4><span class=\"ez-toc-section\" id=\"Double_Eccentric_Butterfly_Valves_Double_Offset\"><\/span><a href=\"https:\/\/www.stvvalves.com\/it\/products\/triple-offset-butterfly-valve-14-inch-api-609-worm-gear\/\">Double Eccentric Butterfly Valves<\/a> (Double Offset)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li><strong>Progetto:<\/strong>\u00a0The first offset is the shaft placement off the pipe or disc centerline, which allows the disc to move off the seat upon opening, reducing wear on the sealing surface. The second offset is the shaft placement behind the disc plane, creating a cam action during operation that enhances sealing capability and reduces operating torque.<\/li>\n<li><strong>Sealing:<\/strong>\u00a0Typically utilizes a resilient (soft) seat, which can be made of materials like PTFE, rubber, or other polymers, allowing for tight shut-off in various applications.<\/li>\n<li><strong>Applicazioni:<\/strong>\u00a0Suitable for higher pressure and temperature applications than concentric valves but below the extreme conditions that triple offset valves are designed for. Commonly used in water distribution, HVAC systems, light industrial processes, and chemical applications where a tight seal and durability are required.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Triple_Eccentric_Butterfly_Valves_Triple_Offset\"><\/span><a href=\"https:\/\/www.stvvalves.com\/it\/products\/300lb-three-eccentric-butterfly-valve-10-inch-metal-seat-wcb\/\">Triple Eccentric Butterfly Valves<\/a> (Triple Offset)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li><strong>Progetto:<\/strong>\u00a0Incorporates three offsets: two similar to the double eccentric design and a third offset, which involves angling the conical shape of the seating surface. This geometry ensures that the disc only contacts the seat at the final point of closure, minimizing wear and allowing for a metal-to-metal seal.<\/li>\n<li><strong>Sealing:<\/strong>\u00a0The metal-to-metal seat design enables the triple offset valve to handle extreme temperatures, pressures, and corrosive media, providing a long-lasting, bubble-tight seal.<\/li>\n<li><strong>Applicazioni:<\/strong>\u00a0Engineered for the most demanding applications, including high-pressure steam, oil and gas pipelines, power generation, and process industries where reliability and performance under extreme conditions are paramount.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Key_Differences_DoubleTriple_Eccentric_Types\"><\/span>Key Differences (Double\/Triple Eccentric Types)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li><strong>Sealing Mechanism:<\/strong>\u00a0Double eccentric valves usually have resilient seats for good sealing at lower pressures and temperatures, while triple eccentric valves use a metal-to-metal seat design for harsh conditions.<\/li>\n<li><strong>Wear and Tear:<\/strong>\u00a0Triple offset valves minimize wear on the sealing surfaces due to the disc only making contact at full closure, unlike double offset valves, which may experience more wear due to their soft sealing materials.<\/li>\n<li><strong>Application Suitability:<\/strong>\u00a0Double offset valves are versatile for a wide range of applications but might not be suitable for the highest pressures and temperatures. Triple offset valves are designed for extreme conditions where performance and durability are critical.<\/li>\n<\/ul>\n<p>In summary, the choice between double and triple eccentric butterfly valves depends on the specific application requirements, including pressure, temperature, and the nature of the media being handled. Triple offset valves are typically chosen for their ability to perform in extreme conditions, offering durability and a reliable seal, whereas double offset valves provide an efficient and cost-effective solution for a broad range of less severe applications.<\/p>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10360\" title=\"How the Double Eccentric Butterfly Valve Works\" src=\"https:\/\/blog.projectmaterials.com\/wp-content\/uploads\/2018\/04\/double-offset.png\" sizes=\"auto, (max-width: 354px) 100vw, 354px\" srcset=\"https:\/\/blog.projectmaterials.com\/wp-content\/uploads\/2018\/04\/double-offset.png 720w, https:\/\/blog.projectmaterials.com\/wp-content\/uploads\/2018\/04\/double-offset-300x263.png 300w\" alt=\"Detail of double offset butterfly valve\" width=\"354\" height=\"311\" \/>\u00a0.\u00a0 \u00a0 \u00a0 \u00a0\u00a0<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10369 size-full\" title=\"How the Triple Eccentric Butterfly Valve Works\" src=\"https:\/\/blog.projectmaterials.com\/wp-content\/uploads\/2018\/04\/triple-eccentric-structure-1.png\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" srcset=\"https:\/\/blog.projectmaterials.com\/wp-content\/uploads\/2018\/04\/triple-eccentric-structure-1.png 500w, https:\/\/blog.projectmaterials.com\/wp-content\/uploads\/2018\/04\/triple-eccentric-structure-1-300x188.png 300w\" alt=\"Triple eccentric structure\" width=\"500\" height=\"314\" \/><\/div>\n<div><\/div>\n<div>The images show the design difference between a double and a triple eccentric butterfly valve (respectively at the left and right side of the diagram).<\/div>\n<div><\/div>\n<div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"MATERIALS_FOR_BUTTERFLY_VALVES\"><\/span>MATERIALS FOR BUTTERFLY VALVES<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<\/div>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Double and triple eccentric butterfly valves are both designed to offer improved performance over traditional concentric butterfly valves, especially in high-pressure and high-temperature applications. The terms \u201cdouble\u201d and \u201ctriple\u201d refer to the number of offsets (eccentricities) in the valve design, which significantly affect how the valve operates and seals. Understanding the differences between these two [&hellip;]<\/p>\n","protected":false},"author":290641,"featured_media":7405,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[2657,2658],"class_list":["post-7404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news","tag-double-eccentric-butterfly-valves","tag-triple-eccentric-butterfly-valves"],"_links":{"self":[{"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/posts\/7404","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/users\/290641"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/comments?post=7404"}],"version-history":[{"count":1,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/posts\/7404\/revisions"}],"predecessor-version":[{"id":7406,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/posts\/7404\/revisions\/7406"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/media\/7405"}],"wp:attachment":[{"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/media?parent=7404"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/categories?post=7404"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stvvalves.com\/it\/wp-json\/wp\/v2\/tags?post=7404"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}