{"id":1297,"date":"2022-08-08T16:34:52","date_gmt":"2022-08-08T08:34:52","guid":{"rendered":"https:\/\/limegreen-okapi-448594.hostingersite.com\/?page_id=1297"},"modified":"2026-07-27T18:14:16","modified_gmt":"2026-07-27T10:14:16","slug":"ansi-standard","status":"publish","type":"page","link":"https:\/\/raymonvalve.com\/it\/ansi-standard\/","title":{"rendered":"Guida agli standard per valvole ANSI e ASME"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1297\" class=\"elementor elementor-1297\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f587c874 e-con-full e-flex e-con e-parent\" data-id=\"f587c874\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-86e9eb36 elementor-widget elementor-widget-html\" data-id=\"86e9eb36\" data-element_type=\"widget\" data-e-type=\"widget\" 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.rv-actions{margin-top:22px}}.rv-topicgrid,.rv-routegrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}.rv-topic,.rv-route{padding:22px;border:1px solid var(--rv-line);border-radius:12px;background:#fff}.rv-topic b,.rv-route b{display:block;color:var(--rv-blue);margin-bottom:7px}.rv-topic p,.rv-route p{margin:0;color:#667085;font-size:14px}.rv-limitgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}.rv-limit{padding:24px;border-radius:12px;background:#fff;color:#26344d}.rv-limit h3{margin:0 0 10px;color:#1f29bd;font-size:19px}.rv-limit p{margin:0;font-size:14px}.rv-trust{padding:26px;border:1px solid var(--rv-line);border-left:5px solid var(--rv-blue);border-radius:10px;background:#f8faff}.rv-trustgrid{display:grid;grid-template-columns:1fr 1fr;gap:18px 30px}.rv-trust b{display:block;color:var(--rv-ink);margin-bottom:5px}.rv-trust p{margin:0;color:#667085;font-size:14px}.rv-trustlinks{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.rv-trustlinks a{color:var(--rv-blue);font-size:13px;font-weight:800}body.page-id-1297 #content,body.page-id-1297 .site-content,body.page-id-1297 #primary,body.page-id-1297 #main,body.page-id-1297 .entry-content{margin-top:0!important;padding-top:0!important}body.page-id-1297 .site-content>.ast-container{max-width:100%!important;padding-left:0!important;padding-right:0!important}@media(max-width:980px){.rv-topicgrid,.rv-routegrid,.rv-limitgrid{grid-template-columns:1fr 1fr}}@media(max-width:640px){.rv-topicgrid,.rv-routegrid,.rv-limitgrid,.rv-trustgrid{grid-template-columns:1fr}}<\/style><main class=\"rv-cat\">\n<section class=\"rv-hero\"><div class=\"rv-wrap\"><div class=\"rv-crumb\"><a href=\"\/\">Home<\/a> \/ <a href=\"\/support\/\">Resources<\/a> \/ ANSI and ASME Valve Standards Guide<\/div><div class=\"rv-kicker\" style=\"color:#f3cc18\">Clarifying a common valve procurement ambiguity<\/div><h1 class=\"rv-title\">ANSI vs ASME Valve Standards: Ratings, Dimensions and Interfaces<\/h1><p>In valve purchasing, \u201cANSI valve\u201d is often used as shorthand for an ASME pressure class or North American flange pattern. That shorthand is not precise enough for engineering release. ANSI coordinates and accredits standards-development processes, while ASME publishes many of the documents commonly used for valve pressure-temperature ratings, face-to-face dimensions, flanges and welding ends. A reliable requisition names the actual standard, edition, class, material group, size range and interface\u2014not merely \u201cANSI 150\u201d or \u201cANSI dimensions.\u201d<\/p><div class=\"rv-actions\"><a class=\"rv-btn rv-primary\" href=\"\/contact\/\">Request Technical Review<\/a><a class=\"rv-btn rv-ghost\" href=\"#technical-scope\">Open Technical Scope<\/a><\/div><div class=\"rv-pills\"><span class=\"rv-pill\">ANSI role clarified<\/span><span class=\"rv-pill\">ASME B16 scope<\/span><span class=\"rv-pill\">Class is not pressure<\/span><span class=\"rv-pill\">Mating-interface control<\/span><\/div><\/div><\/section>\n<section id=\"technical-scope\" class=\"rv-section\"><div class=\"rv-wrap\"><div class=\"rv-kicker\">Technical scope<\/div><h2 class=\"rv-h2\">Translate \u201cANSI valve\u201d into requirements a supplier can verify<\/h2><div class=\"rv-topicgrid\"><div class=\"rv-topic\"><b>Name the publishing organization<\/b><p>Do not treat ANSI and ASME as interchangeable brand names. Identify the document designation and the organization responsible for its technical content.<\/p><\/div><div class=\"rv-topic\"><b>Define the pressure class<\/b><p>Class 150, 300 and higher designations are rating classes, not fixed pressure values. Allowable pressure depends on material group and temperature under the governing rules.<\/p><\/div><div class=\"rv-topic\"><b>Specify the valve rating basis<\/b><p>Confirm whether ASME B16.34 or another product-specific route controls the pressure-temperature rating and construction requirements.<\/p><\/div><div class=\"rv-topic\"><b>Control face-to-face dimensions<\/b><p>Use the applicable dimensional standard, valve pattern and class. A flange standard alone does not establish valve face-to-face length.<\/p><\/div><div class=\"rv-topic\"><b>Match both mating ends<\/b><p>Flange outside diameter, drilling, facing, thickness and other details\u2014or butt-weld preparation and pipe schedule\u2014must be coordinated with the piping system.<\/p><\/div><div class=\"rv-topic\"><b>Resolve product-standard interaction<\/b><p>The valve product standard, ASME interface documents and project specification may all apply. Define precedence instead of selecting isolated familiar clauses.<\/p><\/div><\/div><\/div><\/section>\n<section class=\"rv-section rv-dark\"><div class=\"rv-wrap\"><div class=\"rv-kicker\" style=\"color:#f3cc18\">Evidence matrix<\/div><h2 class=\"rv-h2\">Separate the ASME B16 documents buyers frequently combine<\/h2><div class=\"rv-tablewrap\"><table class=\"rv-table\"><thead><tr><th>Engineering question<\/th><th>Common reference<\/th><th>What to specify<\/th><th>Frequent error to prevent<\/th><\/tr><\/thead><tbody><tr><td>Valve pressure-temperature rating and construction<\/td><td>ASME B16.34<\/td><td>Valve type within scope, material group, class, design temperature, ends and any product-standard additions.<\/td><td>Assuming the class number equals allowable pressure at every temperature.<\/td><\/tr><tr><td>Valve face-to-face or end-to-end dimension<\/td><td>ASME B16.10<\/td><td>Valve type\/pattern, size, class and dimensional series that applies to the selected construction.<\/td><td>Using flange dimensions to infer the installed valve length.<\/td><\/tr><tr><td>Smaller nominal pipe flanges<\/td><td>ASME B16.5<\/td><td>Size and class within scope, material, facing and mating bolting\/gasket coordination.<\/td><td>Writing only \u201cANSI flange\u201d without edition, class, facing or mating details.<\/td><\/tr><tr><td>Large-diameter flanges<\/td><td>ASME B16.47<\/td><td>Applicable series, nominal size, class, facing and compatibility with the mating pipeline flange.<\/td><td>Mixing Series A and Series B interfaces because both share the same nominal size and class label.<\/td><\/tr><tr><td>Factory-made butt-welding ends<\/td><td>ASME B16.25<\/td><td>End preparation, wall thickness or schedule, bore transition and any project machining details.<\/td><td>Ordering a weld-end valve without the actual mating pipe dimensions.<\/td><\/tr><tr><td>Actuator mounting interface<\/td><td>ISO 5210 or ISO 5211 where specified<\/td><td>Valve output, mounting flange, drive dimensions, loads and adapter responsibilities.<\/td><td>Calling an actuator flange ANSI when a separate ISO or supplier interface controls.<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/section>\n<section class=\"rv-section\"><div class=\"rv-wrap\"><div class=\"rv-kicker\">Engineering evidence<\/div><h2 class=\"rv-h2\">Information required for a dimensionally interchangeable valve<\/h2><div class=\"rv-routegrid\"><div class=\"rv-route\"><b>Rating basis<\/b><p>Class, material group and design temperature establish the allowable pressure route.<\/p><\/div><div class=\"rv-route\"><b>Envelope dimensions<\/b><p>Face-to-face, centerline and clearance requirements support replacement planning.<\/p><\/div><div class=\"rv-route\"><b>Flanged ends<\/b><p>Standard, size, class, facing, drilling and mating-system details must match.<\/p><\/div><div class=\"rv-route\"><b>Welding ends<\/b><p>Pipe outside diameter, wall, bore and preparation need a coordinated drawing.<\/p><\/div><div class=\"rv-route\"><b>Operator space<\/b><p>Handwheel, gear or actuator envelope and removal clearances affect installation.<\/p><\/div><div class=\"rv-route\"><b>Approved drawing<\/b><p>The purchaser should review all critical interfaces instead of relying on a generic catalog image.<\/p><\/div><\/div><\/div><\/section>\n<section class=\"rv-section rv-dark\"><div class=\"rv-wrap\"><div class=\"rv-kicker\" style=\"color:#f3cc18\">Technical boundaries<\/div><h2 class=\"rv-h2\">Claims and shortcuts this page does not support<\/h2><div class=\"rv-limitgrid\"><div class=\"rv-limit\"><h3>\u201cANSI class\u201d is incomplete purchasing language<\/h3><p>It does not identify the product standard, material group, design temperature, end details, face-to-face series or testing requirements.<\/p><\/div><div class=\"rv-limit\"><h3>Same class does not guarantee interchangeability<\/h3><p>Valves can differ in face-to-face length, flange series, bore, operator envelope and product construction while carrying the same class designation.<\/p><\/div><div class=\"rv-limit\"><h3>A standards summary cannot be used as a rating table<\/h3><p>Pressure-temperature values and dimensional tables must come from the controlled licensed edition selected by the project.<\/p><\/div><\/div><\/div><\/section>\n<section class=\"rv-section\"><div class=\"rv-wrap\"><div class=\"rv-kicker\">Controlled workflow<\/div><h2 class=\"rv-h2\">From requirement to auditable evidence<\/h2><div class=\"rv-flow\"><div class=\"rv-step\"><b>1. Replace shorthand<\/b><span>Convert every use of \u201cANSI valve\u201d into specific document designations and engineering attributes.<\/span><\/div><div class=\"rv-step\"><b>2. Confirm design conditions<\/b><span>Review maximum\/minimum temperature, pressure cases, fluid and transients before selecting class.<\/span><\/div><div class=\"rv-step\"><b>3. Select rating and product routes<\/b><span>Coordinate ASME B16.34 where applicable with the valve product standard.<\/span><\/div><div class=\"rv-step\"><b>4. Build an interface sheet<\/b><span>Record face-to-face, flange or weld-end, bore, actuator and access dimensions.<\/span><\/div><div class=\"rv-step\"><b>5. Check supplier drawings<\/b><span>Compare proposed dimensions and materials with piping drawings and mating components.<\/span><\/div><div class=\"rv-step\"><b>6. Approve with document precedence<\/b><span>Close discrepancies and retain the approved general arrangement with the order record.<\/span><\/div><\/div><\/div><\/section>\n<section class=\"rv-section rv-dark\"><div class=\"rv-wrap\"><div class=\"rv-kicker\" style=\"color:#f3cc18\">Project checklist<\/div><h2 class=\"rv-h2\">Information and records to define<\/h2><div class=\"rv-check\"><div>Actual ASME\/other document numbers and contract editions<\/div><div>Design pressure, temperature and upset cases<\/div><div>Valve pressure class and material\/rating group<\/div><div>Product standard and valve construction<\/div><div>Face-to-face or end-to-end dimensional series<\/div><div>Flange standard, series, facing, drilling, bolting and gasket<\/div><div>Weld-end pipe OD, schedule\/wall and bore transition<\/div><div>Operator\/actuator interface, envelope and approved drawing<\/div><\/div><\/div><\/section>\n<section class=\"rv-section\"><div class=\"rv-wrap\"><div class=\"rv-kicker\">Technical authority and scope<\/div><h2 class=\"rv-h2\">How this resource should be used<\/h2><div class=\"rv-trust\"><div class=\"rv-trustgrid\"><div><b>Primary search intent<\/b><p>Clarification and specification guidance for engineers searching ANSI valve dimensions or ANSI pressure classes who need to convert imprecise terminology into verifiable ASME and project requirements.<\/p><\/div><div><b>Technical content owner<\/b><p>Raymon Valve technical content team. Final project decisions require the controlled documents and responsible engineer or quality reviewer.<\/p><\/div><div><b>Standards boundary<\/b><p>ASME publishes the cited B16 standards; ANSI's role is not a substitute document designation. This page does not reproduce rating or dimensional tables. Confirm scope and current edition through asme.org and use licensed documents, the product standard and project requirements for final design.<\/p><\/div><div><b>Review status<\/b><p>Technical scope reviewed 27 July 2026. Editions, procedures, acceptance criteria and product evidence must be reconfirmed before order.<\/p><\/div><\/div><div class=\"rv-trustlinks\"><a href=\"\/support\/\">Resource Center<\/a><a href=\"\/valve-standards\/\">Valve Standards<\/a><a href=\"\/valve-inspection\/\">Inspection &amp; Testing<\/a><a href=\"\/contact\/\">Request Technical Review<\/a><\/div><\/div><\/div><\/section>\n<section class=\"rv-section\"><div class=\"rv-wrap\"><div class=\"rv-kicker\">Frequently asked questions<\/div><h2 class=\"rv-h2\">ANSI and ASME Valve Standards Guide FAQ<\/h2><div class=\"rv-faq\"><details><summary>Is an ANSI valve the same as an ASME valve?<\/summary><p>Not as a precise technical description. In industry, ANSI is often used informally for a class or flange convention, but purchasing should state the actual ASME or other governing standard and all required attributes.<\/p><\/details><details><summary>Does Class 150 mean 150 psi maximum pressure?<\/summary><p>No. The class is a designation. Allowable pressure depends on the applicable standard, material group and temperature, so the controlled pressure-temperature rating must be checked for the design case.<\/p><\/details><details><summary>Does ASME B16.34 define flange drilling?<\/summary><p>B16.34 addresses valves within its scope, including rating and construction requirements. Detailed mating flange dimensions are normally coordinated through the applicable flange standard, such as ASME B16.5 or B16.47.<\/p><\/details><details><summary>Can two Class 300 valves always replace each other?<\/summary><p>No. Verify product standard, face-to-face dimensions, flange series\/facing, bore, materials, flow direction, operator envelope and project tests before treating them as interchangeable.<\/p><\/details><\/div><\/div><\/section>\n<section class=\"rv-section\" style=\"padding-top:0\"><div class=\"rv-wrap\"><div class=\"rv-cta\"><div><div class=\"rv-kicker\" style=\"color:#f3cc18\">Technical evidence review<\/div><h2>Send the requirement and the evidence you need to verify<\/h2><p>We will identify the applicable scope, missing records and approval path without inventing compliance claims.<\/p><\/div><div class=\"rv-actions\"><a class=\"rv-btn rv-primary\" href=\"\/contact\/\">Request Technical Review<\/a><\/div><\/div><\/div><\/section>\n<\/main><script type=\"application\/ld+json\">[{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/raymonvalve.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Resources\",\"item\":\"https:\/\/raymonvalve.com\/support\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"ANSI and ASME Valve Standards Guide\",\"item\":\"https:\/\/raymonvalve.com\/ansi-standard\/\"}]},{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is an ANSI valve the same as an ASME valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not as a precise technical description. In industry, ANSI is often used informally for a class or flange convention, but purchasing should state the actual ASME or other governing standard and all required attributes.\"}},{\"@type\":\"Question\",\"name\":\"Does Class 150 mean 150 psi maximum pressure?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The class is a designation. Allowable pressure depends on the applicable standard, material group and temperature, so the controlled pressure-temperature rating must be checked for the design case.\"}},{\"@type\":\"Question\",\"name\":\"Does ASME B16.34 define flange drilling?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"B16.34 addresses valves within its scope, including rating and construction requirements. Detailed mating flange dimensions are normally coordinated through the applicable flange standard, such as ASME B16.5 or B16.47.\"}},{\"@type\":\"Question\",\"name\":\"Can two Class 300 valves always replace each other?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Verify product standard, face-to-face dimensions, flange series\/facing, bore, materials, flow direction, operator envelope and project tests before treating them as interchangeable.\"}}]}]<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>In valve purchasing, \u201cANSI valve\u201d is often used as shorthand for an ASME pressure class or North American flange pattern.<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"full-width","ast-site-content-layout":"full-width","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-1297","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/pages\/1297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/comments?post=1297"}],"version-history":[{"count":83,"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/pages\/1297\/revisions"}],"predecessor-version":[{"id":13487,"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/pages\/1297\/revisions\/13487"}],"wp:attachment":[{"href":"https:\/\/raymonvalve.com\/it\/wp-json\/wp\/v2\/media?parent=1297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}