{"id":623,"date":"2025-05-08T14:03:56","date_gmt":"2025-05-08T12:03:56","guid":{"rendered":"https:\/\/corona1.eu\/en\/?page_id=623"},"modified":"2025-05-08T14:11:26","modified_gmt":"2025-05-08T12:11:26","slug":"dual-flap-isolation-dfi-explosion-proof-valve","status":"publish","type":"page","link":"https:\/\/corona1.eu\/en\/explosion-proof-valves\/dual-flap-isolation-dfi-explosion-proof-valve\/","title":{"rendered":"Dual-Flap Isolation (DFI) explosion-proof valve"},"content":{"rendered":"\n<p class=\"has-text-color\" style=\"color:#e79400\"><strong>Shut-off valve<\/strong><\/p>\n\n\n\n<p>The DFI explosion-proof valve operates passively (flow-actuated), meaning that no external energy is required to close the valve flaps when deflagration occurs. When process air flows during normal operation, the air pulls or pushes the valve flaps open, allowing air to flow from the process into the protected equipment. When deflagration occurs in the protected device, the explosion pressure generated reverses the process air flow, closing the valve flaps and preventing the deflagration flame front from entering.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/corona1.eu\/wp-content\/uploads\/2022\/09\/zawor_dfi_3_2022.png\" alt=\"\"\/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/corona1.eu\/wp-content\/uploads\/2022\/09\/zawor_dfi_1_2022.png\" alt=\"\"\/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/corona1.eu\/wp-content\/uploads\/2022\/09\/zawor_dfi_2_2022.png\" alt=\"\"\/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p>The DFI explosion-proof valve is designed in accordance with the requirements of NFPA 69 and EN 16477. The main components of the valve include heavy-duty welded steel construction, two isolation flaps, removable inspection hatches, flap latch assemblies and ratchet position indicator sensors for process stopping.<\/p>\n\n\n\n<p>Wide range of applications, suitable for almost any application, it will find use in almost any industry.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/corona1.eu\/wp-content\/uploads\/2022\/09\/DFI-With-flame.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Reliable double-locking mechanism<\/strong><\/p>\n\n\n\n<p>Unlike other flap valves that have failed identical flame isolation tests, it has been proven to withstand pressure differences and oscillations that \u201cpush and pull\u201d a closed flap.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/corona1.eu\/wp-content\/uploads\/2022\/09\/Installed-with-FQ-and-Bend-Rotated-Valve.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Flexible installation<\/strong><\/p>\n\n\n\n<p>Occupies a small footprint and can be installed in horizontal and vertical orientations. Can be located closer to the tank than other flap valves.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/corona1.eu\/wp-content\/uploads\/2022\/09\/Metal-Dust.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Wide range of protective capabilities<\/strong><\/p>\n\n\n\n<p>It can withstand the high pressures associated with almost all types of dust: organic dust ST1 (grain, coal, sugar, flour), organic dust ST2 (chemical, pharmaceutical) and metal dust (aluminum, iron, zinc and other alloys ).<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"col-lg-12 p-0\">\n                <div id=\"videoBanner\" class=\"video-banner bg-overlay\" style=\"background-image: url(&quot;\/wp-content\/uploads\/2022\/09\/fike-klein-f2a066e3.jpg&quot;); background-size: cover; background-position: center center;\">\n                    <div class=\"video__btn text-center\">\n           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[&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":625,"parent":618,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"kg_products_template.php","meta":{"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[25],"tags":[],"class_list":["post-623","page","type-page","status-publish","has-post-thumbnail","hentry","category-explosion-proof-valves"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dual-Flap Isolation (DFI) explosion-proof valve | CORONA Service<\/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:\/\/corona1.eu\/en\/explosion-proof-valves\/dual-flap-isolation-dfi-explosion-proof-valve\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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