{"id":654,"date":"2026-10-02T13:17:42","date_gmt":"2026-10-02T11:17:42","guid":{"rendered":"https:\/\/www.valfonta.com\/producto\/alper-fully-open-safety-valve\/"},"modified":"2026-10-22T09:22:47","modified_gmt":"2026-10-22T07:22:47","slug":"alper-fully-open-safety-valve","status":"publish","type":"product","link":"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/","title":{"rendered":"ALPER safety valve"},"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 safety valve<\/span><\/p><\/nav><article class=\"wp-block-group vf-pdp vfd-model--ALPER 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\">Safety valve \u00b7 Full, instantaneous opening<\/p><h1 class=\"wp-block-heading\">ALPER safety valve<\/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\">Full opening<\/span><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alper-1-700x700-1.jpg\" alt=\"ALPER full-opening safety valve with lever and 90\u00b0 piped discharge\" class=\"wp-image-184\" 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\">Safety valve with full, instantaneous opening (A.I.T.) and 90\u00b0 piped discharge. It detects overpressure in tanks, boilers, or pipelines and discharges the excess fluid without auxiliary power, in bronze or stainless steel and up to 280 \u00b0C.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Inlet<\/span><b>\u00bc\u2033 to 4\u2033 threaded \u00b7 DN15\u2013DN100 flanged<\/b><\/li><li><span>Opening<\/span><b>Full, instantaneous (A.I.T.)<\/b><\/li><li><span>Maximum pressure<\/span><b>PN25 metal seat \u00b7 PN16 PTFE<\/b><\/li><li><span>Max. temperature<\/span><b>280 \u00b0C stainless \u00b7 240 \u00b0C bronze<\/b><\/li><li><span>Material<\/span><b>RG5 bronze or 316L stainless<\/b><\/li><li><span>Discharge<\/span><b>Piped at 90\u00b0<\/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\/ALPER-11-CATALOGO-ESP.pdf\" target=\"_blank\" rel=\"noopener\">Download datasheet <small>PDF<\/small><\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">Questions about the figure or the set pressure? 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>Bench-tested with compressed air<\/li><li>Supplied set to the pressure you specify<\/li><li>Numbered main components<\/li><li>\u00bc\u2033 drain hole for condensate<\/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=\"#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 the ALPER is used for<\/h2><p class=\"wp-block-paragraph\">The <strong>ALPER<\/strong> is a <a href=\"https:\/\/www.valfonta.com\/en\/safety-valves\/\">safety valve<\/a> with full, instantaneous opening for liquids, compressed air, inert gases, and steam. When the pressure exceeds the set value, it opens and discharges the excess fluid; once the pressure returns to normal, it closes again. It has a \u00bc\u2033 female threaded hole for draining and removing condensate. More background in our article on <a href=\"https:\/\/www.valfonta.com\/en\/blog\/pressure-relief-valve-how-to-choose-it\/\">pressure relief devices<\/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 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>Safety valve with full, instantaneous opening (A.I.T.)<\/td><\/tr><tr><th scope=\"row\">Discharge<\/th><td>Piped at 90\u00b0<\/td><\/tr><tr><th scope=\"row\">Connections<\/th><td>Inlet: male BSP thread or DIN flanges \u00b7 Outlet: female BSP thread (flanges on request)<\/td><\/tr><tr><th scope=\"row\">Materials<\/th><td>Bonnet: RG5 bronze or CF-8M stainless \u00b7 Base: RG5 bronze or AISI 316L stainless \u00b7 Plug: PTFE, RG5 bronze, or AISI 316L stainless<\/td><\/tr><tr><th scope=\"row\">Maximum pressure<\/th><td>PN25 with metal seat \u00b7 PN16 with PTFE seat<\/td><\/tr><tr><th scope=\"row\">Maximum temperature<\/th><td>280 \u00b0C in stainless steel \u00b7 240 \u00b0C in bronze<\/td><\/tr><tr><th scope=\"row\">Fluids<\/th><td>Liquids, compressed air, inert gases, and steam<\/td><\/tr><tr><th scope=\"row\">Test<\/th><td>On a test bench with pressurized air at room temperature; supplied set to the requested pressure<\/td><\/tr><tr><th scope=\"row\">Certification<\/th><td>Catalog with PED 97\/23\/EC certificate; CE marking depending on figure (see table). Material, heat, and output certificates on request<\/td><\/tr><tr><th scope=\"row\">Other options<\/th><td>AISI 302\/316 stainless spring \u00b7 Viton, NBR, or EPDM seat \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\">Figures (lever \/ sealed)<\/th><th scope=\"col\">Bonnet \u00b7 base \u00b7 plug<\/th><th scope=\"col\">Inlet<\/th><th scope=\"col\">BSP outlet<\/th><th scope=\"col\">CE certificate<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">375 \/ 376<\/th><td>CF-8M stainless \u00b7 316L stainless \u00b7 316L stainless<\/td><td>Thread \u00bc\u2033\u20131\u00bc\u2033<\/td><td>\u00be\u2033 and 1\u00bc\u2033<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\">377 \/ 378<\/th><td>CF-8M stainless \u00b7 316L stainless \u00b7 316L stainless<\/td><td>Flanges DN15\u2013DN32<\/td><td>\u00be\u2033 and 1\u00bc\u2033<\/td><td>No<\/td><\/tr><tr><th scope=\"row\">385 \/ 386<\/th><td>Bronze \u00b7 316L stainless \u00b7 316L stainless<\/td><td>Thread 3\/8\u2033\u20134\u2033<\/td><td>\u00bd\u2033\u20134\u2033<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\">387 \/ 388<\/th><td>Bronze \u00b7 316L stainless \u00b7 316L stainless<\/td><td>Flanges DN15\u2013DN100<\/td><td>\u00be\u2033\u20134\u2033<\/td><td>No<\/td><\/tr><tr><th scope=\"row\">395 \/ 396<\/th><td>Bronze \u00b7 bronze \u00b7 PTFE or bronze<\/td><td>Thread 3\/8\u2033\u20134\u2033<\/td><td>\u00bd\u2033\u20134\u2033<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\">397 \/ 398<\/th><td>Bronze \u00b7 bronze \u00b7 PTFE or bronze<\/td><td>Flanges DN15\u2013DN100<\/td><td>\u00be\u2033\u20134\u2033<\/td><td>On request<\/td><\/tr><\/tbody><\/table><\/figure><\/div><\/section><section id=\"documentacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">ALPER 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 safety 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\/ALPER-11-CATALOGO-ESP.pdf\" aria-label=\"PDF ALPER safety 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<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Which figure do I need?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">It depends on the material, the connection, and the actuation. Odd-numbered figures (375, 377, 385, 387, 395, and 397) have a lever, and even-numbered ones are sealed. Figures 375 to 378 are stainless steel, 385 to 388 combine a bronze bonnet with a stainless base, and 395 to 398 are bronze, with a PTFE or bronze plug.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What maximum pressure does it accept?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">PN25 with metal seat and PN16 with PTFE seat. The maximum temperature is 280 \u00b0C in stainless steel and 240 \u00b0C in bronze.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Is it supplied preset?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Yes. All are tested on a bench with pressurized air at room temperature and supplied set to the pressure specified by the customer.<\/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\/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, compact brass valve: \u00bc\u2033 to \u00be\u2033, PN16, and 180 \u00b0C.<\/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, in brass\/bronze, from 3\/8\u2033 to 3\u2033.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/alper-atmospheric-valves\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alperatmos-2.jpg\" alt=\"ALPER atmospheric valves\" class=\"wp-image-212\" width=\"300\" height=\"300\" loading=\"lazy\"><b>ALPER atmospheric valves<\/b><span>Same construction, for vacuum and very low pressures.<\/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<\/h2><p class=\"wp-block-paragraph\">Give us your installation details and we will recommend the right figure, size, and seat.<\/p><ul class=\"wp-block-list\"><li>Fluid and temperature<\/li><li>Set pressure<\/li><li>Material and connection (threaded or flanged)<\/li><li>With lever or sealed, and whether you need CE marking<\/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-f554-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"554\">\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\/654#wpcf7-f554-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=\"554\" \/><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-f554-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=\"1792698982.0072b449fe40dbed\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"ALPER\" 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=\"\u00bc\u2033\">\u00bc\u2033<\/option><option value=\"3\/8\u2033\">3\/8\u2033<\/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=\"steam, air, 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>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 safety valve Safety valve \u00b7 Full, instantaneous opening ALPER safety valve Full opening Safety valve with full, instantaneous opening (A.I.T.) and 90\u00b0 piped discharge. It detects overpressure in tanks, boilers, or pipelines and discharges the excess fluid without auxiliary power, in bronze or stainless steel and up to 280 \u00b0C. Request a quoteDownload ... <a title=\"ALPER safety valve\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/\" aria-label=\"Read more about ALPER safety valve\">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 full-opening safety valve | Valfonta","rank_math_description":"ALPER safety valve with full, instantaneous opening, in bronze or 316L stainless. \u00bc\u2033\u20134\u2033 threaded or DN15\u2013DN100 flanged, PN25 (PN16 with PTFE), to 280 \u00b0C.","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-fully-open-safety-valve\/#webpage\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/\",\"name\":\"ALPER full-opening safety valve | Valfonta\",\"description\":\"ALPER safety valve with full, instantaneous opening, in bronze or 316L stainless. \u00bc\u2033\u20134\u2033 threaded or DN15\u2013DN100 flanged, PN25 (PN16 with PTFE), to 280 \u00b0C.\",\"isPartOf\":{\"@id\":\"https:\/\/www.valfonta.com\/#website\"},\"about\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\",\"datePublished\":\"2020-02-05T13:03:06+02:00\",\"dateModified\":\"2025-12-19T10:36:17+02:00\",\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alper-1.jpg\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/#breadcrumb\"},\"mainEntity\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/#product\"}},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alper-1.jpg\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/alper-1.jpg\",\"width\":\"1000\",\"height\":\"1000\",\"caption\":\"Safety valve\",\"inLanguage\":\"en\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/#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 safety valve\",\"item\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/\"}]},{\"@type\":\"Product\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/#product\",\"name\":\"ALPER safety valve\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/\",\"description\":\"Safety valve with full, instantaneous opening (A.I.T.) and 90\u00b0 piped discharge. 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Material, heat, and output certificates on request\"},{\"@type\":\"PropertyValue\",\"name\":\"Other options\",\"value\":\"AISI 302\/316 stainless spring \u00b7 Viton, NBR, or EPDM seat \u00b7 ANSI inlet flange \u00b7 NPT thread\"}],\"category\":\"Safety valves\",\"subjectOf\":[{\"@type\":\"DigitalDocument\",\"name\":\"ALPER safety valve catalog\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ALPER-11-CATALOGO-ESP.pdf\",\"encodingFormat\":\"application\/pdf\"}]},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/alper-fully-open-safety-valve\/#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Which figure do I need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It depends on the material, the connection, and the actuation. Odd-numbered figures (375, 377, 385, 387, 395, and 397) have a lever, and even-numbered ones are sealed. 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