{"id":51,"count":2,"description":"<div class=\"wanan-category-seo\">\n\n.wanan-category-seo{max-width:1200px;margin:0 auto 40px;padding:25px 30px;background:#f8fafc;border-left:4px solid #2563eb;border-radius:8px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;line-height:1.7;color:#334155}\n.wanan-category-seo h2{color:#1e293b;font-size:1.5em;margin-bottom:12px;border:none;padding:0}\n.wanan-category-seo h3{color:#334155;font-size:1.15em;margin:18px 0 8px}\n.wanan-category-seo p{margin:8px 0;color:#475569;font-size:0.95em}\n.wanan-category-seo ul{margin:6px 0;padding-left:20px}\n.wanan-category-seo li{margin:4px 0;color:#475569;font-size:0.93em}\n.wanan-category-seo strong{color:#1e293b}\n.wanan-category-seo a{color:#2563eb;text-decoration:none}\n.wanan-category-seo a:hover{text-decoration:underline}\n\nPressure Vacuum Relief Valve (PVRV) &amp; Breathing Valve Solutions\nProtect your storage tanks, vessels, and process equipment with our certified <strong>pressure vacuum relief valves<\/strong> (also known as <strong>breathing valves<\/strong> or <strong>PVRV valves<\/strong>). Wanan Technology supplies API 2000-compliant and EN 14015-certified tank venting solutions for above-ground storage tanks worldwide.\n\nWhy Your Tank Needs a Pressure Vacuum Valve\n\n<strong>Prevents Over-Pressurization:<\/strong> Tank filling, thermal expansion, and chemical reactions increase internal pressure. Without relief capability, tanks can rupture catastrophically.\n<strong>Prevents Vacuum Collapse:<\/strong> Tank emptying, thermal contraction, and condensation create negative pressure. Atmospheric storage tanks are not designed for vacuum - collapse can occur at surprisingly low differentials (as little as 5-8 mbar for large diameter tanks).\n<strong>Reduces Product Loss:<\/strong> Controlled breathing minimizes evaporative losses of valuable volatile products (crude, gasoline, solvents).\n<strong>Environmental Compliance:<\/strong> Properly sized PVRVs reduce VOC emissions and help facilities meet EPA, EU-IPPC, and local environmental regulations.\n<strong>Fire Exposure Protection:<\/strong> Emergency venting capacity prevents tank failure during external fire exposure scenarios defined in API Standard 2000.\n\n\nPVRV Selection Per API 2000 Guidelines\nProper sizing requires calculating three scenarios: (1) <strong>normal out-breathing<\/strong> from maximum pumping-out rate plus thermal effects, (2) <strong>normal in-breathing<\/strong> from maximum pump-in rate plus thermal contraction, and (3) <strong>emergency venting<\/strong> capacity for fire exposure based on tank surface area, wetted area, and product characteristics. Our free sizing calculator and engineering support ensure correct selection for every application.\n\nInstallation &amp; Maintenance\nAll PVRVs should be inspected monthly for proper operation and undergo full recertification annually. Common issues include pallet sticking (from product residue or ice), debris accumulation on sealing surfaces, and spring fatigue. We supply genuine replacement parts (pallet assemblies, seals, springs) with same-day shipping availability.\n\nExplore our complete <a href=\"\/pt\/categoria-produto\/valvulas-de-vacuo-de-pressao-de-categoria\/\">PVRV and breathing valve lineup<\/a> with pressure settings from 2.5 mbar to 1000 mbar.\n<\/div>","link":"https:\/\/wanantec.com\/pt\/categoria-produto\/valvulas-de-vacuo-de-pressao-de-categoria\/","name":"V\u00e1lvulas de press\u00e3o e v\u00e1cuo","slug":"valvulas-de-vacuo-de-pressao-de-categoria","taxonomy":"product_cat","parent":0,"meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/wanantec.com\/pt\/wp-json\/wp\/v2\/product_cat\/51","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wanantec.com\/pt\/wp-json\/wp\/v2\/product_cat"}],"about":[{"href":"https:\/\/wanantec.com\/pt\/wp-json\/wp\/v2\/taxonomies\/product_cat"}],"wp:post_type":[{"href":"https:\/\/wanantec.com\/pt\/wp-json\/wp\/v2\/product?product_cat=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}