{"id":669,"date":"2026-10-02T13:17:57","date_gmt":"2026-10-02T11:17:57","guid":{"rendered":"https:\/\/www.valfonta.com\/producto\/alper-atmospheric-valves\/"},"modified":"2026-10-22T09:21:42","modified_gmt":"2026-10-22T07:21:42","slug":"alper-atmospheric-valves","status":"publish","type":"product","link":"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/","title":{"rendered":"ALPER atmospheric valves"},"content":{"rendered":"<div class=\"wp-block-group vf-raiz vf-pl-ficha-producto is-layout-flow wp-block-group-is-layout-flow\"><nav class=\"wp-block-group vf-breadcrumbs vfa-aria-label--Breadcrumbs is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"\/en\/\">Home<\/a><span class=\"vf-sep\" aria-hidden=\"true\">\u203a<\/span><a href=\"https:\/\/www.valfonta.com\/en\/safety-valves\/\">Safety valves<\/a><span class=\"vf-sep\" aria-hidden=\"true\">\u203a<\/span><span aria-current=\"page\">ALPER atmospheric valves<\/span><\/p><\/nav><article class=\"wp-block-group vf-pdp vfd-model--ALPER%20atmospheric is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-hero is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-title is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-pdp-eyebrow wp-block-paragraph\">Atmospheric valve \u00b7 Pressure and vacuum<\/p><h1 class=\"wp-block-heading\">ALPER atmospheric valves<\/h1><\/div><div class=\"wp-block-group vf-pdp-media is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-pdp-badge\">Pressure and vacuum<\/span><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alperatmos-2-700x700-1.jpg\" alt=\"ALPER double-regulation atmospheric valve with 90\u00b0 piped discharge and protective mesh\" class=\"wp-image-197\" width=\"700\" height=\"700\" fetchpriority=\"high\"><\/p><\/div><div class=\"wp-block-group vf-pdp-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-lead wp-block-paragraph\">Single- and double-regulation atmospheric valves that let air into or out of sealed vessels. With a double spring, they set vacuum and positive pressure separately, within very small pressure ranges.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Sizes<\/span><b>\u00bd\u2033 to 4\u2033 threaded \u00b7 DIN flanges<\/b><\/li><li><span>Regulation<\/span><b>Single (vacuum) or double (pressure\/vacuum)<\/b><\/li><li><span>Positive pressure<\/span><b>+0.080 to +8 bar<\/b><\/li><li><span>Vacuum<\/span><b>\u22120.050 to \u22120.650 bar<\/b><\/li><li><span>Opening<\/span><b>Progressive<\/b><\/li><li><span>Max. temperature<\/span><b>280 \u00b0C <small>stainless<\/small><\/b><\/li><\/ul><div class=\"wp-block-group vf-pdp-cta is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Request a quote<\/a><a class=\"vf-btn vf-btn--sec\" href=\"\/wp-content\/uploads\/2026\/10\/ATMOSFERICAS-ALPER.pdf\" target=\"_blank\" rel=\"noopener\">Download datasheet <small>PDF<\/small><\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">Questions about the pressure or vacuum setting? Call <a href=\"tel:+34933720888\">933 720 888<\/a> or email <a href=\"mailto:valfonta@valfonta.com\">valfonta@valfonta.com<\/a>.<\/p><\/div><\/div><ul class=\"vf-pdp-trust wp-block-list\"><li>Double spring: vacuum and pressure set separately<\/li><li>Outlet protected with stainless steel mesh<\/li><li>Bronze or stainless steel versions<\/li><li>90\u00b0 piped discharge<\/li><\/ul><nav class=\"wp-block-group vf-pdp-nav vfa-aria-label--Datasheet%20contents is-layout-flow wp-block-group-is-layout-flow\"><ul class=\"wp-block-list\"><li><a href=\"#aplicaciones\">Applications<\/a><\/li><li><a href=\"#especificaciones\">Specifications<\/a><\/li><li><a href=\"#funcionamiento\">Operation<\/a><\/li><li><a href=\"#documentacion\">Documentation<\/a><\/li><li><a href=\"#preguntas\">FAQ<\/a><\/li><li><a href=\"#solicitar\">Request a quote<\/a><\/li><\/ul><\/nav><section id=\"aplicaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">What ALPER atmospheric valves are used for<\/h2><p class=\"wp-block-paragraph\">They protect sealed vessels by balancing their internal pressure with atmospheric pressure. <strong>Single-regulation<\/strong> valves control vacuum only; <strong>double-regulation<\/strong> valves also control positive pressure. The outlet has a stainless steel mesh that keeps out impurities. They are part of the Valfonta range of <a href=\"https:\/\/www.valfonta.com\/en\/safety-valves\/\">safety valves<\/a>.<\/p><\/section><section id=\"especificaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">ALPER atmospheric valve technical specifications<\/h2><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl\"><table><tbody><tr><th scope=\"row\">Type<\/th><td>Single-regulation (vacuum) or double-regulation (pressure \/ vacuum) atmospheric valve<\/td><\/tr><tr><th scope=\"row\">Opening<\/th><td>Progressive<\/td><\/tr><tr><th scope=\"row\">Positive pressure<\/th><td>From +0.080 to +8 bar<\/td><\/tr><tr><th scope=\"row\">Vacuum<\/th><td>From \u22120.050 to \u22120.650 bar<\/td><\/tr><tr><th scope=\"row\">Discharge<\/th><td>Piped at 90\u00b0, with stainless steel mesh<\/td><\/tr><tr><th scope=\"row\">Connections<\/th><td>Inlet: BSP male thread or DIN flanges \u00b7 Outlet: BSP female thread from \u00be\u2033 to 4\u2033 (flanges on request)<\/td><\/tr><tr><th scope=\"row\">Materials<\/th><td>Hood, base, and plug in RG5 bronze or stainless steel (CF-8M hood, AISI 316L base and plug)<\/td><\/tr><tr><th scope=\"row\">Maximum temperature<\/th><td>280 \u00b0C (stainless)<\/td><\/tr><tr><th scope=\"row\">Fluids<\/th><td>Liquids, compressed air, inert gases, and steam<\/td><\/tr><tr><th scope=\"row\">Other options<\/th><td>AISI 302\/316 stainless spring \u00b7 ANSI inlet flange \u00b7 NPT thread<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h3 class=\"wp-block-heading\">Available figures<\/h3><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\">Figure<\/th><th scope=\"col\">Regulation<\/th><th scope=\"col\">Material<\/th><th scope=\"col\">Inlet<\/th><th scope=\"col\">Finish<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">334<\/th><td>Vacuum<\/td><td>Stainless (bronze hood above 1\u00bc\u2033)<\/td><td>BSP thread \u00bd\u2033\u20134\u2033<\/td><td>Natural \/ polished<\/td><\/tr><tr><th scope=\"row\">335<\/th><td>Vacuum<\/td><td>Stainless (bronze hood above 1\u00bc\u2033)<\/td><td>DIN flanges DN15\u2013DN100<\/td><td>Natural \/ polished<\/td><\/tr><tr><th scope=\"row\">350<\/th><td>Vacuum<\/td><td>Bronze<\/td><td>BSP thread \u00bd\u2033\u20134\u2033<\/td><td>Nickel-plated<\/td><\/tr><tr><th scope=\"row\">351<\/th><td>Vacuum<\/td><td>Bronze<\/td><td>DIN flanges<\/td><td>Nickel-plated<\/td><\/tr><tr><th scope=\"row\">336<\/th><td>Pressure \/ vacuum<\/td><td>Stainless (bronze hood above 1\u00bc\u2033)<\/td><td>BSP thread \u00bd\u2033\u20134\u2033<\/td><td>Natural \/ polished<\/td><\/tr><tr><th scope=\"row\">337<\/th><td>Pressure \/ vacuum<\/td><td>Stainless (bronze hood above 1\u00bc\u2033)<\/td><td>DIN flanges DN15\u2013DN100<\/td><td>Natural \/ polished<\/td><\/tr><tr><th scope=\"row\">352<\/th><td>Pressure \/ vacuum<\/td><td>Bronze<\/td><td>BSP thread \u00bd\u2033\u20134\u2033<\/td><td>Nickel-plated<\/td><\/tr><tr><th scope=\"row\">353<\/th><td>Pressure \/ vacuum<\/td><td>Bronze<\/td><td>DIN flanges<\/td><td>Nickel-plated<\/td><\/tr><\/tbody><\/table><\/figure><\/div><\/section><section id=\"funcionamiento\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">How they work<\/h2><ol class=\"vf-steps wp-block-list\"><li><b>Vacuum breaking.<\/b> If the internal pressure drops below the vacuum spring setting, the valve opens inward and lets in atmospheric air.<\/li><li><b>Pressure relief<\/b> (double regulation). If the internal pressure exceeds the pressure spring setting, the valve opens outward and releases the excess air or gas.<\/li><\/ol><\/section><section id=\"documentacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">ALPER atmospheric valve technical documentation<\/h2><div class=\"wp-block-group vf-docs is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-doc vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><i>PDF<\/i><\/p><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>ALPER atmospheric valve catalog<\/b><span>PDF \u00b7 3 pages \u00b7 features, figures, and sizes<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/ATMOSFERICAS-ALPER.pdf\" aria-label=\"PDF ALPER atmospheric valve catalog PDF \u00b7 3 pages \u00b7 features, figures, and sizes\" target=\"_blank\" rel=\"noopener\"><\/a><\/p><\/div><\/div><\/section><section id=\"preguntas\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Frequently asked questions about the ALPER atmospheric valve<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is the difference between single and double regulation?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Single regulation (figures 334, 335, 350, and 351) acts only against vacuum. Double regulation (336, 337, 352, and 353) has two springs and also acts against positive pressure.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Where is it installed?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">In a vertical position, on top of the tank or pipe. Check periodically that the outlet mesh is clean.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Do they carry CE marking?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">No. According to the catalog, none of the atmospheric valve figures carries CE certification.<\/p><\/div><\/details><\/section><section id=\"relacionados\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Other Valfonta safety valves<\/h2><ul class=\"vf-rel wp-block-list\"><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alper-1.jpg\" alt=\"ALPER safety valve\" class=\"wp-image-165\" width=\"300\" height=\"300\" loading=\"lazy\"><b>ALPER safety valve<\/b><span>Full, instantaneous opening, up to PN25 and 280 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/safety-valves-for-boilers-jas\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/jas-1.jpg\" alt=\"JAS safety valve\" class=\"wp-image-211\" width=\"300\" height=\"300\" loading=\"lazy\"><b>JAS safety valve<\/b><span>Full opening in brass, from \u00bc\u2033 to \u00be\u2033 and PN16.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/progressive-opening-safety-valve\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alivio-368-700x700-1.jpg\" alt=\"368\u2013371 safety valve\" class=\"wp-image-196\" width=\"300\" height=\"300\" loading=\"lazy\"><b>368\u2013371 safety valve<\/b><span>Progressive opening, set pressure from 0 to 16 bar.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/pressure-relief-valve\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-perspectiva-400.webp\" alt=\"Pressure relief valves\" class=\"wp-image-10230\" width=\"300\" height=\"300\" loading=\"lazy\"><b>Pressure relief valves<\/b><span>S1\u2013S4 and PRV53\u201355 range, from DN15 to DN150 and set pressure up to 20 barg.<\/span><\/a><\/li><\/ul><\/section><section id=\"solicitar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-quote is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Request a quote for the ALPER atmospheric valve<\/h2><p class=\"wp-block-paragraph\">Give us the details of your tank and we will recommend the right figure and size.<\/p><ul class=\"wp-block-list\"><li>Tank fluid and temperature<\/li><li>Set pressure and\/or vacuum setting<\/li><li>Material: bronze or stainless<\/li><li>Size and connection (threaded or flanged)<\/li><\/ul><p class=\"vf-pdp-contact wp-block-paragraph\">You can also call <a href=\"tel:+34933720888\">933 720 888<\/a>.<\/p><\/div>\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f568-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"568\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/product\/669#wpcf7-f568-o1\" method=\"post\" class=\"wpcf7-form init vf-form wpcf7-acceptance-as-validation\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\" toolname=\"solicitar_oferta\" tooldescription=\"Request a quote from Valfonta for the models on this page (model, size, fluid and pressures); a member of the team will reply.\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"568\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.2.3\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f568-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/><input type=\"hidden\" name=\"_vf_t\" value=\"1792698946.5e1f34601a427ec3\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"ALPER atmosf\u00e9rica\" type=\"hidden\" name=\"modelo\" \/><label>Name *<span class=\"wpcf7-form-control-wrap\" data-name=\"nombre\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" autocomplete=\"name\" aria-required=\"true\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"nombre\" \/><\/span><\/label><label>Company<span class=\"wpcf7-form-control-wrap\" data-name=\"empresa\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" autocomplete=\"organization\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"empresa\" \/><\/span><\/label><label>Email *<span class=\"wpcf7-form-control-wrap\" data-name=\"email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" autocomplete=\"email\" aria-required=\"true\" aria-invalid=\"false\" value=\"\" type=\"email\" name=\"email\" \/><\/span><\/label><label>Phone<span class=\"wpcf7-form-control-wrap\" data-name=\"telefono\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-text wpcf7-validates-as-tel\" autocomplete=\"tel\" aria-invalid=\"false\" value=\"\" type=\"tel\" name=\"telefono\" \/><\/span><\/label><fieldset><legend>Application data (optional)<\/legend><label>Size<span class=\"wpcf7-form-control-wrap\" data-name=\"dn\"><select class=\"wpcf7-form-control wpcf7-select\" aria-invalid=\"false\" name=\"dn\"><option value=\"\">Select<\/option><option value=\"\u00bd\u2033\">\u00bd\u2033<\/option><option value=\"\u00be\u2033\">\u00be\u2033<\/option><option value=\"1\u2033\">1\u2033<\/option><option value=\"1\u00bc\u2033\">1\u00bc\u2033<\/option><option value=\"1\u00bd\u2033\">1\u00bd\u2033<\/option><option value=\"2\u2033\">2\u2033<\/option><option value=\"2\u00bd\u2033\">2\u00bd\u2033<\/option><option value=\"3\u2033\">3\u2033<\/option><option value=\"4\u2033\">4\u2033<\/option><option value=\"DN15 to DN100 (flanged)\">DN15 to DN100 (flanged)<\/option><option value=\"I don&#039;t know\">I don&#039;t know<\/option><\/select><\/span><\/label><label>Fluid<span class=\"wpcf7-form-control-wrap\" data-name=\"fluido\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"air, inert gas, water\u2026\" value=\"\" type=\"text\" name=\"fluido\" \/><\/span><\/label><label>Set pressure (bar)<span class=\"wpcf7-form-control-wrap\" data-name=\"tarado\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"tarado\" \/><\/span><\/label><label>Set vacuum (bar)<span class=\"wpcf7-form-control-wrap\" data-name=\"vacio\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"e.g. \u22120.1\" value=\"\" type=\"text\" name=\"vacio\" \/><\/span><\/label><label>Temperature (\u00b0C)<span class=\"wpcf7-form-control-wrap\" data-name=\"temperatura\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"temperatura\" \/><\/span><\/label><\/fieldset><label class=\"vf-full\">Message<span class=\"wpcf7-form-control-wrap\" data-name=\"mensaje\"><textarea cols=\"40\" rows=\"4\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" name=\"mensaje\"><\/textarea><\/span><\/label><label class=\"vf-chk vf-full\"><span class=\"wpcf7-form-control-wrap\" data-name=\"privacidad\"><span class=\"wpcf7-form-control wpcf7-acceptance\"><span class=\"wpcf7-list-item\"><input type=\"checkbox\" name=\"privacidad\" value=\"1\" aria-invalid=\"false\" \/><\/span><\/span><\/span> <span>I have read and accept the <a href=\"\/en\/privacy-policy\/\">privacy policy<\/a> *<\/span><\/label><input class=\"wpcf7-form-control wpcf7-submit has-spinner vf-btn vf-btn--pri\" type=\"submit\" value=\"Send request\" \/><span class=\"vf-hp\" aria-hidden=\"true\"><label>Web <input type=\"text\" name=\"vf_web\" value=\"\" tabindex=\"-1\" autocomplete=\"off\" toolparamdescription=\"Campo de control: d\u00e9jalo vac\u00edo\"><\/label><\/span><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n\n<\/div><\/section><div class=\"wp-block-group vf-pdp-bar is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"tel:+34933720888\">Call<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Request a quote<\/a><\/p><\/div><\/article><\/div>","protected":false},"excerpt":{"rendered":"<p>Home\u203aSafety valves\u203aALPER atmospheric valves Atmospheric valve \u00b7 Pressure and vacuum ALPER atmospheric valves Pressure and vacuum Single- and double-regulation atmospheric valves that let air into or out of sealed vessels. With a double spring, they set vacuum and positive pressure separately, within very small pressure ranges. Request a quoteDownload datasheet PDF Questions about the pressure ... <a title=\"ALPER atmospheric valves\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/\" aria-label=\"Read more about ALPER atmospheric valves\">Read more<\/a><\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"_generate-full-width-content":"true","_generate-disable-headline":"true","rank_math_title":"ALPER atmospheric valves for vacuum and pressure | Valfonta","rank_math_description":"ALPER single (vacuum) or double (pressure\/vacuum) regulation atmospheric valves for sealed vessels. From +0.080 to +8 bar and from \u22120.050 to \u22120.650 bar.","rank_math_focus_keyword":"","vf_jsonld":"[{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.valfonta.com\/#organization\",\"name\":\"Valfonta\",\"legalName\":\"Val Fonta, S.L.\",\"taxID\":\"B59935718\",\"url\":\"https:\/\/www.valfonta.com\/en\/\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valfonta-logo.webp\"},\"foundingDate\":\"1962\",\"email\":\"valfonta@valfonta.com\",\"telephone\":\"+34 933 720 888\",\"address\":{\"@type\":\"PostalAddress\",\"streetAddress\":\"C\/ Bronze 26, Pol. Ind. Les Guixeres\",\"postalCode\":\"08915\",\"addressLocality\":\"Badalona\",\"addressRegion\":\"Barcelona\",\"addressCountry\":\"ES\"},\"description\":\"Design, manufacture, and sale of pressure reducing valves, pressure relief valves, and control valves.\"},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.valfonta.com\/#website\",\"url\":\"https:\/\/www.valfonta.com\/en\/\",\"name\":\"Valfonta\",\"publisher\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\"},{\"@type\":\"ItemPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/#webpage\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/\",\"name\":\"ALPER atmospheric valves for vacuum and pressure | Valfonta\",\"description\":\"ALPER single (vacuum) or double (pressure\/vacuum) regulation atmospheric valves for sealed vessels. From +0.080 to +8 bar and from \u22120.050 to \u22120.650 bar.\",\"isPartOf\":{\"@id\":\"https:\/\/www.valfonta.com\/#website\"},\"about\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\",\"datePublished\":\"2020-02-05T13:26:55+02:00\",\"dateModified\":\"2025-12-19T10:43:37+02:00\",\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alperatmos-2-700x700-1.jpg\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/#breadcrumb\"},\"mainEntity\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/#product\"}},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alperatmos-2-700x700-1.jpg\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alperatmos-2-700x700-1.jpg\",\"width\":\"1000\",\"height\":\"1000\",\"caption\":\"Atmospheric valve\",\"inLanguage\":\"en\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.valfonta.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Safety valves\",\"item\":\"https:\/\/www.valfonta.com\/en\/safety-valves\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"ALPER atmospheric valves\",\"item\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/\"}]},{\"@type\":\"Product\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/#product\",\"name\":\"ALPER atmospheric valves\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/\",\"description\":\"Single- and double-regulation atmospheric valves that let air into or out of sealed vessels. With a double spring, they set vacuum and positive pressure separately, within very small pressure ranges.\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Valfonta\"},\"manufacturer\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"model\":\"ALPER atmospheric\",\"image\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alperatmos-2-700x700-1.jpg\",\"material\":\"Bronze RG5 or stainless steel AISI 316L \/ CF-8M\",\"additionalProperty\":[{\"@type\":\"PropertyValue\",\"name\":\"Type\",\"value\":\"Single-regulation (vacuum) or double-regulation (pressure \/ vacuum) atmospheric valve\"},{\"@type\":\"PropertyValue\",\"name\":\"Opening\",\"value\":\"Progressive\"},{\"@type\":\"PropertyValue\",\"name\":\"Positive pressure\",\"value\":\"From +0.080 to +8 bar\"},{\"@type\":\"PropertyValue\",\"name\":\"Vacuum\",\"value\":\"From \u22120.050 to \u22120.650 bar\"},{\"@type\":\"PropertyValue\",\"name\":\"Discharge\",\"value\":\"Piped at 90\u00b0, with stainless steel mesh\"},{\"@type\":\"PropertyValue\",\"name\":\"Connections\",\"value\":\"Inlet: BSP male thread or DIN flanges \u00b7 Outlet: BSP female thread from \u00be\u2033 to 4\u2033 (flanges on request)\"},{\"@type\":\"PropertyValue\",\"name\":\"Materials\",\"value\":\"Hood, base, and plug in RG5 bronze or stainless steel (CF-8M hood, AISI 316L base and plug)\"},{\"@type\":\"PropertyValue\",\"name\":\"Maximum temperature\",\"value\":\"280 \u00b0C (stainless)\"},{\"@type\":\"PropertyValue\",\"name\":\"Fluids\",\"value\":\"Liquids, compressed air, inert gases, and steam\"},{\"@type\":\"PropertyValue\",\"name\":\"Other options\",\"value\":\"AISI 302\/316 stainless spring \u00b7 ANSI inlet flange \u00b7 NPT thread\"}],\"category\":\"Safety valves\",\"subjectOf\":[{\"@type\":\"DigitalDocument\",\"name\":\"ALPER atmospheric valve catalog\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ATMOSFERICAS-ALPER.pdf\",\"encodingFormat\":\"application\/pdf\"}]},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the difference between single and double regulation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Single regulation (figures 334, 335, 350, and 351) acts only against vacuum. Double regulation (336, 337, 352, and 353) has two springs and also acts against positive pressure.\"}},{\"@type\":\"Question\",\"name\":\"Where is it installed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In a vertical position, on top of the tank or pipe. Check periodically that the outlet mesh is clean.\"}},{\"@type\":\"Question\",\"name\":\"Do they carry CE marking?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. According to the catalog, none of the atmospheric valve figures carries CE certification.\"}}]}]}]"},"product_brand":[],"product_cat":[79],"product_tag":[],"class_list":["post-669","product","type-product","status-publish","product_cat-sin-categorizar","first","instock","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product\/669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media?parent=669"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_brand?post=669"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_cat?post=669"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_tag?post=669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}