{"id":18759,"date":"2026-10-11T08:53:57","date_gmt":"2026-10-11T08:53:57","guid":{"rendered":"https:\/\/oudianvalve.com\/?p=18759"},"modified":"2026-10-11T08:53:57","modified_gmt":"2026-10-11T08:53:57","slug":"asme-b16-34-valve-specification-the-comprehensive-guide","status":"publish","type":"post","link":"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/","title":{"rendered":"ASME B16.34 Valve Specification: The Comprehensive Guide"},"content":{"rendered":"<p>A\u00a0purchaser\u00a0reviewing\u00a0an\u00a0ASME\u00a0B16.34\u00a0valve\u00a0specification\u00a0must\u00a0confirm\u00a0the\u00a0equipment\u00a0can\u00a0handle\u00a0a\u00a0project\u2019s\u00a0pressure,\u00a0temperature,\u00a0and\u00a0service\u00a0conditions.\u00a0A\u00a0mismatch\u00a0can\u00a0leave\u00a0a\u00a0valve\u00a0unsuitable\u00a0for\u00a0the\u00a0piping\u00a0system,\u00a0even\u00a0if\u00a0its\u00a0nameplate\u00a0shows\u00a0a\u00a0familiar\u00a0class.\u00a0Confident\u00a0procurement\u00a0depends\u00a0on\u00a0matching\u00a0equipment\u00a0requirements\u00a0to\u00a0materials,\u00a0ratings,\u00a0inspection\u00a0needs,\u00a0and\u00a0project\u00a0documents.<\/p>\n<p>The\u00a0pressure-temperature\u00a0rating\u00a0is\u00a0the\u00a0maximum\u00a0pressure\u00a0permitted\u00a0for\u00a0a\u00a0specified\u00a0material\u00a0and\u00a0pressure\u00a0class\u00a0at\u00a0a\u00a0given\u00a0temperature\u00a0under\u00a0the\u00a0standard.\u00a0ASME\u00a0B16.34\u00a0is\u00a0a\u00a0technical\u00a0standard,\u00a0not\u00a0a\u00a0substitute\u00a0for\u00a0application-specific\u00a0engineering\u00a0judgment.\u00a0This\u00a0guide\u00a0helps\u00a0you\u00a0assess\u00a0its\u00a0role\u00a0in\u00a0engineering\u00a0specifications\u00a0for\u00a0industrial\u00a0piping,\u00a0then\u00a0check\u00a0the\u00a0details\u00a0that\u00a0support\u00a0a\u00a0sound\u00a0selection.\u00a0Start\u00a0by\u00a0confirming\u00a0whether\u00a0the\u00a0equipment\u00a0and\u00a0its\u00a0end\u00a0connection\u00a0fall\u00a0within\u00a0the\u00a0standard\u2019s\u00a0scope.<\/p>\n<div class=\"image-embed\" data-image=\"{&quot;src&quot;:&quot;https:\/\/storage.googleapis.com\/48877118-7272-4a4d-b302-0465d8aa4548\/7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3\/e6ed3c0d-2262-4108-bc1f-9349a25532ce.jpg&quot;,&quot;title&quot;:&quot;ASME B16.34 Valve Specification: The Comprehensive Guide&quot;,&quot;method&quot;:&quot;text-to-image&quot;,&quot;generator&quot;:&quot;2&quot;,&quot;date&quot;:1791708321629}\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Info_1itgw_4\" contenteditable=\"false\" data-media=\"true\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u041e\u0433\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u0435<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0430\u0442\u044c<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#ASME_B1634_Valve_Specification_The_Comprehensive_Guide\" >ASME B16.34 Valve Specification: The Comprehensive Guide<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Key_Takeaways\" >Key\u00a0Takeaways<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Where_Does_ASME_B1634_Apply_and_Where_Does_It_Stop\" >Where\u00a0Does\u00a0ASME\u00a0B16.34\u00a0Apply,\u00a0and\u00a0Where\u00a0Does\u00a0It\u00a0Stop?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Valve_types_and_end_connections_covered\" >Valve\u00a0types\u00a0and\u00a0end\u00a0connections\u00a0covered<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Scope_limits_that_can_rule_out_an_application\" >Scope\u00a0limits\u00a0that\u00a0can\u00a0rule\u00a0out\u00a0an\u00a0application<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#What_Does_the_ASME_B1634_Valve_Specification_The_Comprehensive_Guide_Cover\" >What\u00a0Does\u00a0the\u00a0ASME\u00a0B16.34\u00a0Valve\u00a0Specification:\u00a0The\u00a0Comprehensive\u00a0Guide\u00a0Cover?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Which_Materials_Does_ASME_B1634_Group_for_Valve_Selection\" >Which\u00a0Materials\u00a0Does\u00a0ASME\u00a0B16.34\u00a0Group\u00a0for\u00a0Valve\u00a0Selection?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#The_three_material_groups_and_common_examples\" >The\u00a0three\u00a0material\u00a0groups\u00a0and\u00a0common\u00a0examples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#How_to_verify_the_material_designation\" >How\u00a0to\u00a0verify\u00a0the\u00a0material\u00a0designation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#How_Do_ASME_B1634_Pressure-Temperature_Ratings_Work\" >How\u00a0Do\u00a0ASME\u00a0B16.34\u00a0Pressure-Temperature\u00a0Ratings\u00a0Work?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Class_150_valve_pressure_rating_checked_against_operating_temperature\" >Class 150 valve pressure rating checked against operating temperature<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Reading_the_rating_tables_for_a_material_and_class\" >Reading\u00a0the\u00a0rating\u00a0tables\u00a0for\u00a0a\u00a0material\u00a0and\u00a0class<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Why_temperature_notes_can_change_the_answer\" >Why\u00a0temperature\u00a0notes\u00a0can\u00a0change\u00a0the\u00a0answer<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#What_Is_the_Difference_Between_Standard_Special_and_Limited_Class\" >What\u00a0Is\u00a0the\u00a0Difference\u00a0Between\u00a0Standard,\u00a0Special,\u00a0and\u00a0Limited\u00a0Class?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Standard_and_Special_Class_requirements\" >Standard\u00a0and\u00a0Special\u00a0Class\u00a0requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Limited_Class_eligibility_and_identification\" >Limited\u00a0Class\u00a0eligibility\u00a0and\u00a0identification<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#What_Testing_Inspection_and_Marking_Should_You_Verify\" >What\u00a0Testing,\u00a0Inspection,\u00a0and\u00a0Marking\u00a0Should\u00a0You\u00a0Verify?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Valve_shell_testing_and_material_identification_before_shipment\" >Valve shell testing and material identification before shipment<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Pressure_tests_and_examination\" >Pressure\u00a0tests\u00a0and\u00a0examination<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Markings_that_support_traceability\" >Markings\u00a0that\u00a0support\u00a0traceability<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#How_Should_You_Select_and_Specify_a_Compliant_Valve\" >How\u00a0Should\u00a0You\u00a0Select\u00a0and\u00a0Specify\u00a0a\u00a0Compliant\u00a0Valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Conclusion\" >\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#FAQ\" >\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Does_Class_150_mean_a_valve_is_rated_for_150_psi_at_every_temperature\" >Does\u00a0Class\u00a0150\u00a0mean\u00a0a\u00a0valve\u00a0is\u00a0rated\u00a0for\u00a0150\u00a0psi\u00a0at\u00a0every\u00a0temperature?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Can_a_flanged_valve_be_Class_4500_under_ASME_B1634\" >Can\u00a0a\u00a0flanged\u00a0valve\u00a0be\u00a0Class\u00a04500\u00a0under\u00a0ASME\u00a0B16.34?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Does_every_ASME_B1634_valve_require_NDE\" >Does\u00a0every\u00a0ASME\u00a0B16.34\u00a0valve\u00a0require\u00a0NDE?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#What_does_a_B1634_marking_on_a_valve_confirm\" >What\u00a0does\u00a0a\u00a0B16.34\u00a0marking\u00a0on\u00a0a\u00a0valve\u00a0confirm?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#Can_ASME_B1634_replace_API_6D_for_a_pipeline_valve\" >Can\u00a0ASME\u00a0B16.34\u00a0replace\u00a0API\u00a06D\u00a0for\u00a0a\u00a0pipeline\u00a0valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/oudianvalve.com\/ru\/2026\/10\/asme-b16-34-valve-specification-the-comprehensive-guide\/#How_do_I_know_which_edition_of_ASME_B1634_to_put_in_a_purchase_order\" >How\u00a0do\u00a0I\u00a0know\u00a0which\u00a0edition\u00a0of\u00a0ASME\u00a0B16.34\u00a0to\u00a0put\u00a0in\u00a0a\u00a0purchase\u00a0order?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h4 class=\"_Title_1itgw_69\"><span class=\"ez-toc-section\" id=\"ASME_B1634_Valve_Specification_The_Comprehensive_Guide\"><\/span>ASME B16.34 Valve Specification: The Comprehensive Guide<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key\u00a0Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Check\u00a0scope\u00a0before\u00a0using\u00a0the\u00a0standard\u2019s\u00a0technical\u00a0requirements.<\/li>\n<li>Match\u00a0material,\u00a0pressure\u00a0class,\u00a0and\u00a0operating\u00a0temperature.<\/li>\n<li>Read\u00a0project\u00a0documents\u00a0for\u00a0added\u00a0requirements\u00a0and\u00a0the\u00a0required\u00a0edition.<\/li>\n<li>Review\u00a0testing,\u00a0inspection,\u00a0and\u00a0marking\u00a0records\u00a0against\u00a0the\u00a0order.<\/li>\n<li>Ask\u00a0the\u00a0responsible\u00a0engineer\u00a0to\u00a0resolve\u00a0application-specific\u00a0questions.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Where_Does_ASME_B1634_Apply_and_Where_Does_It_Stop\"><\/span>Where\u00a0Does\u00a0ASME\u00a0B16.34\u00a0Apply,\u00a0and\u00a0Where\u00a0Does\u00a0It\u00a0Stop?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>ASME\u00a0B16.34\u00a0applies\u00a0to\u00a0specified\u00a0valve\u00a0constructions\u00a0and\u00a0listed\u00a0materials,\u00a0but\u00a0<em>not\u00a0every<\/em>\u00a0valve\u00a0or\u00a0operating\u00a0condition\u00a0falls\u00a0within\u00a0its\u00a0scope.\u00a0It\u00a0covers\u00a0flanged,\u00a0threaded,\u00a0and\u00a0welded-end\u00a0valves\u00a0made\u00a0from\u00a0steel,\u00a0nickel-based\u00a0alloys,\u00a0and\u00a0other\u00a0listed\u00a0materials.<\/p>\n<p>The\u00a0standard\u00a0addresses\u00a0pressure-temperature\u00a0ratings,\u00a0dimensions,\u00a0tolerances,\u00a0materials,\u00a0NDE,\u00a0testing,\u00a0and\u00a0marking.\u00a0<strong>Outside\u00a0the\u00a0stated\u00a0scope,\u00a0do\u00a0not\u00a0assume\u00a0ASME\u00a0B16.34\u00a0supplies\u00a0a\u00a0rating\u00a0for\u00a0your\u00a0case.<\/strong>\u00a0Check\u00a0the\u00a0connection,\u00a0size,\u00a0material,\u00a0and\u00a0class\u00a0limits\u00a0before\u00a0relying\u00a0on\u00a0its\u00a0requirements.<\/p>\n<blockquote><p>Outside\u00a0the\u00a0stated\u00a0scope,\u00a0do\u00a0not\u00a0assume\u00a0ASME\u00a0B16.34\u00a0supplies\u00a0a\u00a0rating\u00a0for\u00a0your\u00a0case.<\/p><\/blockquote>\n<h3><span class=\"ez-toc-section\" id=\"Valve_types_and_end_connections_covered\"><\/span>Valve\u00a0types\u00a0and\u00a0end\u00a0connections\u00a0covered<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Flanged,\u00a0threaded,\u00a0and\u00a0welding-end\u00a0valves\u00a0are\u00a0addressed,\u00a0subject\u00a0to\u00a0specific\u00a0limits.\u00a0The\u00a0standard\u00a0also\u00a0sets\u00a0valve\u00a0dimensions\u00a0and\u00a0tolerances,\u00a0alongside\u00a0material,\u00a0examination,\u00a0test,\u00a0and\u00a0marking\u00a0requirements.\u00a0Readers\u00a0searching\u00a0for\u00a0ASME\u00a016.34\u00a0may\u00a0see\u00a0that\u00a0shortened\u00a0form,\u00a0but\u00a0ASME\u00a0B16.34\u00a0is\u00a0the\u00a0standard\u2019s\u00a0correct\u00a0designation.<\/p>\n<p>Use\u00a0this\u00a0quick\u00a0checklist\u00a0before\u00a0applying\u00a0the\u00a0standard\u2019s\u00a0requirements:<\/p>\n<ul>\n<li>End\u00a0connection:\u00a0flanged,\u00a0threaded,\u00a0or\u00a0welding-end.<\/li>\n<li>Material\u00a0family:\u00a0steel,\u00a0nickel-based\u00a0alloy,\u00a0or\u00a0another\u00a0listed\u00a0material.<\/li>\n<li>Nominal\u00a0size:\u00a0flanged\u00a0valves\u00a0larger\u00a0than\u00a0NPS\u00a060\u00a0are\u00a0outside\u00a0the\u00a0stated\u00a0scope.<\/li>\n<li>Class\u00a0or\u00a0temperature\u00a0limit:\u00a0confirm\u00a0the\u00a0applicable\u00a0boundary\u00a0below.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Scope_limits_that_can_rule_out_an_application\"><\/span>Scope\u00a0limits\u00a0that\u00a0can\u00a0rule\u00a0out\u00a0an\u00a0application<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Class\u00a04500\u00a0applies\u00a0only\u00a0to\u00a0welding-end\u00a0valves.\u00a0Threaded-end\u00a0valves\u00a0above\u00a0Class\u00a02500\u00a0or\u00a0with\u00a0temperature\u00a0ratings\u00a0above\u00a01000\u00b0F\u00a0are\u00a0outside\u00a0the\u00a0stated\u00a0scope.\u00a0Flanged-end\u00a0valves\u00a0are\u00a0limited\u00a0to\u00a0standard\u00a0class\u00a0ratings\u00a0under\u00a0the\u00a0scope.<\/p>\n<p>These\u00a0limits\u00a0matter\u00a0even\u00a0when\u00a0a\u00a0valve\u00a0resembles\u00a0a\u00a0covered\u00a0design.\u00a0A\u00a0buyer\u00a0should\u00a0not\u00a0infer\u00a0that\u00a0a\u00a0rating\u00a0applies\u00a0just\u00a0because\u00a0a\u00a0catalog\u00a0lists\u00a0a\u00a0pressure\u00a0class\u00a0or\u00a0familiar\u00a0material.\u00a0Once\u00a0applicability\u00a0is\u00a0clear,\u00a0the\u00a0next\u00a0question\u00a0is\u00a0how\u00a0the\u00a0standard\u00a0fits\u00a0with\u00a0the\u00a0project\u2019s\u00a0other\u00a0documents.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Does_the_ASME_B1634_Valve_Specification_The_Comprehensive_Guide_Cover\"><\/span>What\u00a0Does\u00a0the\u00a0ASME\u00a0B16.34\u00a0Valve\u00a0Specification:\u00a0The\u00a0Comprehensive\u00a0Guide\u00a0Cover?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Codes\u00a0set\u00a0system-level\u00a0rules,\u00a0while\u00a0standards\u00a0specify\u00a0equipment-level\u00a0requirements.\u00a0<em>That\u00a0distinction<\/em>\u00a0helps\u00a0you\u00a0use\u00a0ASME\u00a016.34\u00a0alongside\u00a0the\u00a0piping\u00a0code,\u00a0material\u00a0specifications,\u00a0and\u00a0purchase\u00a0documents\u00a0that\u00a0govern\u00a0a\u00a0valve\u00a0order.<\/p>\n<p><strong>ASME\u00a0B16.34\u00a0sets\u00a0valve\u00a0requirements,\u00a0but\u00a0it\u00a0does\u00a0not\u00a0replace\u00a0the\u00a0piping\u00a0code\u00a0or\u00a0project\u00a0documents.<\/strong>\u00a0An\u00a0ASTM\u00a0material\u00a0specification\u00a0sets\u00a0requirements\u00a0for\u00a0a\u00a0material;\u00a0it\u00a0is\u00a0not\u00a0the\u00a0same\u00a0thing\u00a0as\u00a0a\u00a0valve\u00a0datasheet.\u00a0Project\u00a0documents\u00a0can\u00a0add\u00a0requirements\u00a0for\u00a0design,\u00a0inspection,\u00a0and\u00a0documentation.<\/p>\n<p>For\u00a0example,\u00a0a\u00a0refinery\u00a0project\u00a0may\u00a0use\u00a0ASME\u00a0B31.3\u00a0as\u00a0its\u00a0piping\u00a0code.\u00a0API\u00a06D\u00a0or\u00a0API\u00a0600\u00a0may\u00a0add\u00a0valve-type-specific\u00a0requirements,\u00a0depending\u00a0on\u00a0the\u00a0valve\u00a0and\u00a0application.\u00a0The\u00a0package\u00a0should\u00a0make\u00a0clear\u00a0which\u00a0specifications\u00a0apply,\u00a0rather\u00a0than\u00a0leaving\u00a0procurement\u00a0to\u00a0infer\u00a0them\u00a0from\u00a0a\u00a0product\u00a0description.<\/p>\n<p>The\u00a0purchase\u00a0documents\u00a0should\u00a0identify\u00a0the\u00a0required\u00a0edition\u00a0of\u00a0each\u00a0standard.\u00a0A\u00a0file\u00a0title\u00a0or\u00a0date\u00a0alone\u00a0does\u00a0not\u00a0establish\u00a0which\u00a0edition\u00a0governs.\u00a0Readers\u00a0searching\u00a0the\u00a0phrase\u00a0\u201cASME\u00a0B16.34\u00a0valve\u00a0specification,\u00a0the\u00a0comprehensive\u00a0guide\u00a02020\u201d\u00a0should\u00a0not\u00a0assume\u00a0that\u00a02020\u00a0identifies\u00a0an\u00a0edition;\u00a0confirm\u00a0the\u00a0edition\u00a0explicitly\u00a0in\u00a0the\u00a0contract\u00a0or\u00a0purchase\u00a0documents.<\/p>\n<p>ASTM\u00a0grades\u00a0and\u00a0valve\u00a0requirements\u00a0work\u00a0together,\u00a0but\u00a0they\u00a0answer\u00a0different\u00a0questions.\u00a0The\u00a0project\u00a0package\u00a0sets\u00a0the\u00a0requirements\u00a0for\u00a0the\u00a0ordered\u00a0equipment,\u00a0while\u00a0the\u00a0material\u00a0specification\u00a0identifies\u00a0material\u00a0properties\u00a0and\u00a0controls.\u00a0Those\u00a0material\u00a0choices\u00a0determine\u00a0which\u00a0rating\u00a0information\u00a0applies.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Which_Materials_Does_ASME_B1634_Group_for_Valve_Selection\"><\/span>Which\u00a0Materials\u00a0Does\u00a0ASME\u00a0B16.34\u00a0Group\u00a0for\u00a0Valve\u00a0Selection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>ASME\u00a0B16.34\u00a0organizes\u00a0listed\u00a0materials\u00a0into\u00a0<em>three\u00a0groups<\/em>\u00a0with\u00a049\u00a0subgroups,\u00a0based\u00a0on\u00a0similar\u00a0pressure-temperature\u00a0performance\u00a0characteristics.\u00a0<strong>Use\u00a0the\u00a0group\u00a0that\u00a0matches\u00a0the\u00a0valve\u00a0material\u00a0when\u00a0selecting\u00a0rating\u00a0information,\u00a0not\u00a0a\u00a0material\u00a0family\u00a0name\u00a0alone.<\/strong><\/p>\n<p>The\u00a0groups\u00a0help\u00a0connect\u00a0a\u00a0material\u00a0designation\u00a0to\u00a0the\u00a0relevant\u00a0standard\u00a0requirements.\u00a0They\u00a0do\u00a0not\u00a0establish\u00a0that\u00a0every\u00a0alloy\u00a0in\u00a0a\u00a0group\u00a0has\u00a0identical\u00a0properties\u00a0or\u00a0is\u00a0suitable\u00a0for\u00a0every\u00a0service.\u00a0Confirm\u00a0the\u00a0specific\u00a0grade\u00a0and\u00a0project\u00a0requirements\u00a0for\u00a0the\u00a0parts\u00a0that\u00a0contact\u00a0the\u00a0process.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_three_material_groups_and_common_examples\"><\/span>The\u00a0three\u00a0material\u00a0groups\u00a0and\u00a0common\u00a0examples<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This\u00a0comparison\u00a0shows\u00a0the\u00a0broad\u00a0material\u00a0families\u00a0and\u00a0examples\u00a0named\u00a0in\u00a0the\u00a0standard.\u00a0Group\u00a02\u00a0includes\u00a0stainless\u00a0and\u00a0duplex\u00a0stainless\u00a0materials;\u00a0subgroup\u00a02.13\u00a0for\u00a0duplex\u00a0stainless\u00a0steels\u00a0was\u00a0introduced\u00a0in\u00a0a\u00a0newer\u00a0revision.<\/p>\n<table>\n<tbody>\n<tr>\n<td data-row=\"head\">Material\u00a0group<\/td>\n<td data-row=\"head\">Material\u00a0family<\/td>\n<td data-row=\"head\">Examples\u00a0or\u00a0selection\u00a0note<\/td>\n<\/tr>\n<tr>\n<td data-row=\"2\">Group\u00a01<\/td>\n<td data-row=\"2\">Carbon\u00a0and\u00a0low-alloy\u00a0steels<\/td>\n<td data-row=\"2\">Forged\u00a0ASTM\u00a0A105;\u00a0cast\u00a0ASTM\u00a0A216\u00a0Grade\u00a0WCB<\/td>\n<\/tr>\n<tr>\n<td data-row=\"3\">Group\u00a02<\/td>\n<td data-row=\"3\">Stainless\u00a0and\u00a0duplex\u00a0stainless\u00a0steels<\/td>\n<td data-row=\"3\">Subgroup\u00a02.13\u00a0covers\u00a0duplex\u00a0stainless\u00a0steels<\/td>\n<\/tr>\n<tr>\n<td data-row=\"4\">Group\u00a03<\/td>\n<td data-row=\"4\">Nickel\u00a0and\u00a0nickel\u00a0alloys<\/td>\n<td data-row=\"4\">Use\u00a0where\u00a0selected\u00a0service\u00a0conditions\u00a0call\u00a0for\u00a0those\u00a0alloys<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"How_to_verify_the_material_designation\"><\/span>How\u00a0to\u00a0verify\u00a0the\u00a0material\u00a0designation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Check\u00a0the\u00a0body,\u00a0bonnet,\u00a0disc,\u00a0and\u00a0seat\u00a0against\u00a0the\u00a0project\u2019s\u00a0material\u00a0requirements.\u00a0A\u00a0valve\u00a0may\u00a0combine\u00a0different\u00a0materials\u00a0across\u00a0those\u00a0components,\u00a0so\u00a0the\u00a0body\u00a0grade\u00a0alone\u00a0does\u00a0not\u00a0establish\u00a0that\u00a0every\u00a0part\u00a0meets\u00a0the\u00a0order.<\/p>\n<p>Match\u00a0each\u00a0ASTM\u00a0grade\u00a0designation\u00a0to\u00a0the\u00a0specified\u00a0material\u00a0requirement,\u00a0including\u00a0the\u00a0correct\u00a0product\u00a0form\u00a0where\u00a0stated.\u00a0Forged\u00a0ASTM\u00a0A105\u00a0and\u00a0cast\u00a0ASTM\u00a0A216\u00a0Grade\u00a0WCB\u00a0are\u00a0different\u00a0designations,\u00a0not\u00a0interchangeable\u00a0labels.\u00a0<em>Small\u00a0distinctions<\/em>\u00a0in\u00a0a\u00a0grade\u00a0can\u00a0change\u00a0which\u00a0material\u00a0and\u00a0rating\u00a0information\u00a0applies.<\/p>\n<p>The\u00a0selected\u00a0material\u00a0group\u00a0is\u00a0one\u00a0input\u00a0to\u00a0the\u00a0rating\u00a0check,\u00a0not\u00a0a\u00a0complete\u00a0selection\u00a0decision.\u00a0You\u00a0still\u00a0need\u00a0the\u00a0class\u00a0and\u00a0operating\u00a0temperature,\u00a0along\u00a0with\u00a0any\u00a0service-specific\u00a0limits\u00a0in\u00a0the\u00a0project\u00a0documents.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_ASME_B1634_Pressure-Temperature_Ratings_Work\"><\/span>How\u00a0Do\u00a0ASME\u00a0B16.34\u00a0Pressure-Temperature\u00a0Ratings\u00a0Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A\u00a0Class\u00a0150\u00a0valve\u00a0made\u00a0from\u00a0ASTM\u00a0A106\u00a0Grade\u00a0C\u00a0has\u00a0a\u00a0pressure-temperature\u00a0rating\u00a0of\u00a0260\u00a0psig\u00a0at\u00a0200\u00b0F\u00a0and\u00a095\u00a0psig\u00a0at\u00a0750\u00b0F.\u00a0<em>The\u00a0temperature\u00a0matters<\/em>:\u00a0the\u00a0material,\u00a0class,\u00a0and\u00a0operating\u00a0temperature\u00a0must\u00a0be\u00a0read\u00a0together.<\/p>\n<p><strong>Class\u00a0150\u00a0does\u00a0not\u00a0mean\u00a0one\u00a0fixed\u00a0allowable\u00a0pressure\u00a0at\u00a0every\u00a0temperature.<\/strong>\u00a0For\u00a0the\u00a0same\u00a0material\u00a0and\u00a0class,\u00a0allowable\u00a0pressure\u00a0generally\u00a0decreases\u00a0as\u00a0temperature\u00a0rises.\u00a0The\u00a0applicable\u00a0pressure-temperature\u00a0rating\u00a0gives\u00a0the\u00a0permitted\u00a0pressure\u00a0at\u00a0the\u00a0stated\u00a0temperature.<\/p>\n<div class=\"image-embed\" data-image=\"{&quot;src&quot;:&quot;https:\/\/storage.googleapis.com\/48877118-7272-4a4d-b302-0465d8aa4548\/7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3\/9e05be9c-17be-4430-bde0-bff67925ec07.jpg&quot;,&quot;title&quot;:&quot;Class 150 valve pressure rating checked against operating temperature&quot;,&quot;method&quot;:&quot;text-to-image&quot;,&quot;generator&quot;:&quot;2&quot;,&quot;date&quot;:1791708321529}\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Info_1itgw_4\" contenteditable=\"false\" data-media=\"true\">\n<h4 class=\"_Title_1itgw_69\"><span class=\"ez-toc-section\" id=\"Class_150_valve_pressure_rating_checked_against_operating_temperature\"><\/span>Class 150 valve pressure rating checked against operating temperature<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Reading_the_rating_tables_for_a_material_and_class\"><\/span>Reading\u00a0the\u00a0rating\u00a0tables\u00a0for\u00a0a\u00a0material\u00a0and\u00a0class<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Use\u00a0the\u00a0table\u00a0for\u00a0the\u00a0material\u00a0and\u00a0class,\u00a0then\u00a0find\u00a0the\u00a0value\u00a0at\u00a0the\u00a0operating\u00a0temperature.\u00a0Table\u00a02\u00a0gives\u00a0metric\u00a0pressure-temperature\u00a0ratings;\u00a0Table\u00a0VII\u00a0gives\u00a0U.S.\u00a0customary\u00a0ratings.\u00a0For\u00a0U.S.\u00a0procurement,\u00a0the\u00a0latter\u00a0presents\u00a0values\u00a0such\u00a0as\u00a0psig\u00a0and\u00a0\u00b0F.<\/p>\n<p>The\u00a0Class\u00a0150\u00a0valve\u00a0pressure\u00a0rating\u00a0in\u00a0the\u00a0example\u00a0is\u00a0260\u00a0psig\u00a0at\u00a0200\u00b0F,\u00a0but\u00a0only\u00a095\u00a0psig\u00a0at\u00a0750\u00b0F.\u00a0That\u00a0difference\u00a0is\u00a0why\u00a0an\u00a0ASME\u00a0Class\u00a0150\u00a0pressure\u00a0rating\u00a0cannot\u00a0be\u00a0read\u00a0as\u00a0a\u00a0single\u00a0pressure\u00a0limit\u00a0without\u00a0its\u00a0temperature\u00a0and\u00a0material.<\/p>\n<p>First\u00a0confirm\u00a0the\u00a0valve\u2019s\u00a0exact\u00a0material\u00a0designation\u00a0and\u00a0pressure\u00a0class.\u00a0Then\u00a0locate\u00a0the\u00a0corresponding\u00a0rating\u00a0information\u00a0for\u00a0the\u00a0operating\u00a0temperature.\u00a0Do\u00a0not\u00a0use\u00a0a\u00a0nearby\u00a0grade\u00a0or\u00a0a\u00a0table\u00a0for\u00a0a\u00a0different\u00a0component\u00a0simply\u00a0because\u00a0the\u00a0material\u00a0names\u00a0look\u00a0similar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_temperature_notes_can_change_the_answer\"><\/span>Why\u00a0temperature\u00a0notes\u00a0can\u00a0change\u00a0the\u00a0answer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A\u00a0table\u00a0value\u00a0does\u00a0not\u00a0override\u00a0a\u00a0material-specific\u00a0service\u00a0limit.\u00a0ASTM\u00a0A352\u00a0Grade\u00a0LCC\u00a0has\u00a0a\u00a0note\u00a0limiting\u00a0maximum\u00a0service\u00a0temperature\u00a0to\u00a0650\u00b0F,\u00a0even\u00a0though\u00a0a\u00a0table\u00a0may\u00a0show\u00a0values\u00a0up\u00a0to\u00a0800\u00b0F\u00a0for\u00a0the\u00a0relevant\u00a0range.<\/p>\n<p><strong>For\u00a0ASTM\u00a0A352\u00a0Grade\u00a0LCC,\u00a0the\u00a0650\u00b0F\u00a0note\u00a0limits\u00a0service\u00a0despite\u00a0a\u00a0table\u00a0extending\u00a0to\u00a0800\u00b0F.<\/strong>\u00a0A\u00a0listed\u00a0pressure\u00a0at\u00a0a\u00a0higher\u00a0temperature\u00a0does\u00a0not\u00a0make\u00a0that\u00a0service\u00a0acceptable.\u00a0Read\u00a0the\u00a0notes\u00a0attached\u00a0to\u00a0the\u00a0material\u00a0and\u00a0rating\u00a0information,\u00a0not\u00a0just\u00a0the\u00a0numerical\u00a0row.<\/p>\n<p>The\u00a0phrase\u00a0\u201cASME\u00a0B16-5\u00a0pressure-temperature\u00a0rating\u00a0table\u201d\u00a0can\u00a0refer\u00a0to\u00a0flange\u00a0rating\u00a0information\u00a0associated\u00a0with\u00a0ASME\u00a0B16.5.\u00a0ASME\u00a0B16.34\u00a0contains\u00a0valve\u00a0rating\u00a0tables.\u00a0Use\u00a0the\u00a0table\u00a0that\u00a0applies\u00a0to\u00a0the\u00a0component\u00a0and\u00a0specification\u00a0in\u00a0your\u00a0order,\u00a0since\u00a0a\u00a0valve\u00a0and\u00a0a\u00a0flange\u00a0may\u00a0be\u00a0governed\u00a0by\u00a0different\u00a0requirements.<\/p>\n<p>After\u00a0confirming\u00a0the\u00a0rating\u00a0value,\u00a0check\u00a0the\u00a0valve\u2019s\u00a0class\u00a0designation.\u00a0That\u00a0label\u00a0can\u00a0bring\u00a0additional\u00a0inspection\u00a0and\u00a0identification\u00a0requirements\u00a0beyond\u00a0the\u00a0pressure-temperature\u00a0rating\u00a0itself.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_Standard_Special_and_Limited_Class\"><\/span>What\u00a0Is\u00a0the\u00a0Difference\u00a0Between\u00a0Standard,\u00a0Special,\u00a0and\u00a0Limited\u00a0Class?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Standard,\u00a0Special,\u00a0and\u00a0Limited\u00a0Class\u00a0identify\u00a0different\u00a0<em>requirements<\/em>\u00a0for\u00a0a\u00a0valve,\u00a0not\u00a0just\u00a0different\u00a0wording\u00a0on\u00a0its\u00a0nameplate.\u00a0The\u00a0applicable\u00a0designation\u00a0depends\u00a0on\u00a0the\u00a0end\u00a0connection,\u00a0size,\u00a0and\u00a0inspection\u00a0expectations.<\/p>\n<p><strong>Special\u00a0Class\u00a0adds\u00a0NDE\u00a0requirements,\u00a0while\u00a0Limited\u00a0Class\u00a0is\u00a0restricted\u00a0to\u00a0threaded-end\u00a0or\u00a0welding-end\u00a0valves\u00a0of\u00a0NPS\u00a02\u00bd\u00a0or\u00a0smaller.<\/strong>\u00a0Limited\u00a0Class\u00a0ratings\u00a0are\u00a0not\u00a0permitted\u00a0for\u00a0flanged-end\u00a0valves.\u00a0Check\u00a0the\u00a0marking\u00a0and\u00a0the\u00a0order\u00a0together\u00a0to\u00a0confirm\u00a0the\u00a0designation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Standard_and_Special_Class_requirements\"><\/span>Standard\u00a0and\u00a0Special\u00a0Class\u00a0requirements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Standard\u00a0Class\u00a0applies\u00a0to\u00a0valves\u00a0that\u00a0meet\u00a0the\u00a0standard\u2019s\u00a0basic\u00a0requirements.\u00a0Special\u00a0Class\u00a0applies\u00a0to\u00a0threaded-end\u00a0or\u00a0welding-end\u00a0valves\u00a0and\u00a0adds\u00a0NDE\u00a0requirements\u00a0beyond\u00a0Standard\u00a0Class.\u00a0Its\u00a0marking\u00a0includes\u00a0\u201cSPL,\u201d\u00a0which\u00a0helps\u00a0identify\u00a0that\u00a0added\u00a0examination\u00a0category.<\/p>\n<p>The\u00a0added\u00a0NDE\u00a0can\u00a0affect\u00a0what\u00a0inspection\u00a0records\u00a0a\u00a0buyer\u00a0requests.\u00a0Confirm\u00a0the\u00a0ordered\u00a0class\u00a0and\u00a0required\u00a0examination\u00a0documentation\u00a0together;\u00a0a\u00a0familiar\u00a0pressure\u00a0class\u00a0does\u00a0not,\u00a0by\u00a0itself,\u00a0show\u00a0which\u00a0class\u00a0category\u00a0applies.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Limited_Class_eligibility_and_identification\"><\/span>Limited\u00a0Class\u00a0eligibility\u00a0and\u00a0identification<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Limited\u00a0Class\u00a0applies\u00a0only\u00a0to\u00a0threaded-end\u00a0or\u00a0welding-end\u00a0valves\u00a0sized\u00a0NPS\u00a02\u00bd\u00a0or\u00a0smaller.\u00a0Its\u00a0identifying\u00a0marking\u00a0is\u00a0\u201cB16.34\u00a0LTD.\u201d\u00a0Flanged-end\u00a0valves\u00a0cannot\u00a0use\u00a0Limited\u00a0Class\u00a0ratings,\u00a0even\u00a0when\u00a0their\u00a0size\u00a0is\u00a0within\u00a0that\u00a0limit.<\/p>\n<table>\n<tbody>\n<tr>\n<td data-row=\"head\">Class<\/td>\n<td data-row=\"head\">Eligible\u00a0end\u00a0connection<\/td>\n<td data-row=\"head\">Distinguishing\u00a0requirement<\/td>\n<td data-row=\"head\">\u041c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0430<\/td>\n<\/tr>\n<tr>\n<td data-row=\"2\">\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442<\/td>\n<td data-row=\"2\">As\u00a0covered\u00a0by\u00a0the\u00a0standard<\/td>\n<td data-row=\"2\">Meets\u00a0basic\u00a0standard\u00a0requirements<\/td>\n<td data-row=\"2\">No\u00a0special\u00a0label\u00a0specified\u00a0here<\/td>\n<\/tr>\n<tr>\n<td data-row=\"3\">Special<\/td>\n<td data-row=\"3\">Threaded-end\u00a0or\u00a0welding-end<\/td>\n<td data-row=\"3\">Additional\u00a0NDE\u00a0requirements<\/td>\n<td data-row=\"3\">SPL<\/td>\n<\/tr>\n<tr>\n<td data-row=\"4\">\u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439<\/td>\n<td data-row=\"4\">Threaded-end\u00a0or\u00a0welding-end,\u00a0NPS\u00a02\u00bd\u00a0or\u00a0smaller<\/td>\n<td data-row=\"4\">Limited\u00a0size\u00a0and\u00a0connection\u00a0scope<\/td>\n<td data-row=\"4\">B16.34\u00a0LTD.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>When\u00a0a\u00a0purchase\u00a0document\u00a0calls\u00a0for\u00a0Special\u00a0or\u00a0Limited\u00a0Class,\u00a0make\u00a0the\u00a0designation\u00a0explicit.\u00a0That\u00a0prevents\u00a0a\u00a0supplier\u00a0from\u00a0treating\u00a0the\u00a0class\u00a0label\u00a0as\u00a0a\u00a0simple\u00a0pressure\u00a0description.\u00a0The\u00a0next\u00a0check\u00a0is\u00a0whether\u00a0the\u00a0delivered\u00a0valve\u2019s\u00a0inspection\u00a0evidence\u00a0and\u00a0traceability\u00a0match\u00a0its\u00a0designation.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Testing_Inspection_and_Marking_Should_You_Verify\"><\/span>What\u00a0Testing,\u00a0Inspection,\u00a0and\u00a0Marking\u00a0Should\u00a0You\u00a0Verify?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A\u00a0valve\u2019s\u00a0required\u00a0tests\u00a0and\u00a0identification\u00a0need\u00a0checking\u00a0before\u00a0it\u00a0is\u00a0accepted\u00a0for\u00a0shipment.\u00a0<em>Evidence\u00a0matters<\/em>:\u00a0the\u00a0delivered\u00a0equipment\u00a0should\u00a0match\u00a0the\u00a0order\u00a0in\u00a0both\u00a0its\u00a0test\u00a0records\u00a0and\u00a0its\u00a0traceable\u00a0markings.<\/p>\n<p><strong>ASME\u00a0B16.34\u00a0requires\u00a0pressure\u00a0testing\u00a0before\u00a0shipment.<\/strong>\u00a0A\u00a0shell\u00a0test\u00a0checks\u00a0structural\u00a0integrity\u00a0and\u00a0external\u00a0leakage;\u00a0a\u00a0seat\u00a0test\u00a0checks\u00a0sealing\u00a0when\u00a0the\u00a0valve\u00a0is\u00a0closed.\u00a0The\u00a0standard\u2019s\u00a0requirements\u00a0also\u00a0address\u00a0NDE,\u00a0which\u00a0can\u00a0include\u00a0radiographic\u00a0or\u00a0ultrasonic\u00a0examination.<\/p>\n<div class=\"image-embed\" data-image=\"{&quot;src&quot;:&quot;https:\/\/storage.googleapis.com\/48877118-7272-4a4d-b302-0465d8aa4548\/7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3\/e6ab4b9c-86c2-42c0-a105-64b85ee4f164.jpg&quot;,&quot;title&quot;:&quot;Valve shell testing and material identification before shipment&quot;,&quot;method&quot;:&quot;text-to-image&quot;,&quot;generator&quot;:&quot;2&quot;,&quot;date&quot;:1791708321429}\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Info_1itgw_4\" contenteditable=\"false\" data-media=\"true\">\n<h4 class=\"_Title_1itgw_69\"><span class=\"ez-toc-section\" id=\"Valve_shell_testing_and_material_identification_before_shipment\"><\/span>Valve shell testing and material identification before shipment<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Pressure_tests_and_examination\"><\/span>Pressure\u00a0tests\u00a0and\u00a0examination<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Review\u00a0the\u00a0test\u00a0records\u00a0for\u00a0the\u00a0ordered\u00a0valve\u00a0and\u00a0confirm\u00a0that\u00a0they\u00a0identify\u00a0the\u00a0tested\u00a0equipment.\u00a0Do\u00a0not\u00a0infer\u00a0a\u00a0test\u00a0pressure\u00a0or\u00a0acceptance\u00a0limit\u00a0from\u00a0a\u00a0class\u00a0marking;\u00a0use\u00a0the\u00a0governing\u00a0standard\u00a0and\u00a0purchase\u00a0requirements\u00a0for\u00a0those\u00a0details.<\/p>\n<p>NDE\u00a0records\u00a0matter\u00a0when\u00a0the\u00a0ordered\u00a0requirements\u00a0call\u00a0for\u00a0examination.\u00a0Radiographic\u00a0and\u00a0ultrasonic\u00a0examination\u00a0are\u00a0examples\u00a0of\u00a0NDE\u00a0methods.\u00a0Confirm\u00a0which\u00a0examinations\u00a0apply\u00a0to\u00a0the\u00a0valve\u00a0and\u00a0what\u00a0records\u00a0the\u00a0order\u00a0requires,\u00a0rather\u00a0than\u00a0assuming\u00a0every\u00a0valve\u00a0has\u00a0identical\u00a0NDE\u00a0obligations.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Markings_that_support_traceability\"><\/span>Markings\u00a0that\u00a0support\u00a0traceability<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>ASME\u00a0B16.34\u00a0marking\u00a0follows\u00a0the\u00a0MSS\u00a0SP-25\u00a0marking\u00a0system.\u00a0Minimum\u00a0markings\u00a0include\u00a0the\u00a0manufacturer,\u00a0body\u00a0or\u00a0bonnet\u00a0material,\u00a0pressure\u00a0rating,\u00a0temperature\u00a0when\u00a0required,\u00a0and\u00a0nominal\u00a0size.\u00a0A\u00a0compliant\u00a0valve\u00a0may\u00a0also\u00a0be\u00a0stamped\u00a0\u201cB16.34.\u201d<\/p>\n<p>Use\u00a0this\u00a0acceptance\u00a0checklist\u00a0for\u00a0the\u00a0delivered\u00a0valve:<\/p>\n<ul>\n<li>Test\u00a0records:\u00a0confirm\u00a0required\u00a0pressure-test\u00a0results\u00a0are\u00a0supplied.<\/li>\n<li>Material\u00a0identification:\u00a0match\u00a0documented\u00a0grades\u00a0to\u00a0the\u00a0order.<\/li>\n<li>Required\u00a0markings:\u00a0check\u00a0the\u00a0valve\u2019s\u00a0visible\u00a0identification.<\/li>\n<li>Order\u00a0consistency:\u00a0compare\u00a0the\u00a0delivered\u00a0valve\u00a0with\u00a0purchase\u00a0documents.<\/li>\n<\/ul>\n<p>A\u00a0\u201cB16.34\u201d\u00a0stamp\u00a0indicates\u00a0that\u00a0the\u00a0valve\u00a0is\u00a0represented\u00a0as\u00a0complying\u00a0with\u00a0the\u00a0standard;\u00a0it\u00a0does\u00a0not\u00a0replace\u00a0the\u00a0required\u00a0records.\u00a0Carry\u00a0the\u00a0verified\u00a0information\u00a0into\u00a0the\u00a0final\u00a0purchasing\u00a0and\u00a0application\u00a0checks.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Should_You_Select_and_Specify_a_Compliant_Valve\"><\/span>How\u00a0Should\u00a0You\u00a0Select\u00a0and\u00a0Specify\u00a0a\u00a0Compliant\u00a0Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A\u00a0request\u00a0for\u00a0a\u00a0\u201cClass\u00a0150\u00a0valve\u201d\u00a0is\u00a0not\u00a0enough\u00a0to\u00a0buy\u00a0a\u00a0compliant\u00a0valve.\u00a0<em>Procurement\u00a0needs\u00a0context<\/em>,\u00a0including\u00a0the\u00a0valve\u00a0type,\u00a0end\u00a0connection,\u00a0material,\u00a0temperature,\u00a0and\u00a0governing\u00a0project\u00a0documents.<\/p>\n<p><strong>ASME\u00a0B16.34\u00a0supports\u00a0design\u00a0and\u00a0quality\u00a0requirements,\u00a0but\u00a0it\u00a0does\u00a0not\u00a0decide\u00a0whether\u00a0a\u00a0valve\u00a0suits\u00a0every\u00a0application.<\/strong>\u00a0Other\u00a0standards\u00a0may\u00a0set\u00a0focused\u00a0requirements\u00a0for\u00a0a\u00a0valve\u00a0type\u00a0or\u00a0service,\u00a0so\u00a0name\u00a0each\u00a0applicable\u00a0standard\u00a0in\u00a0the\u00a0order.<\/p>\n<blockquote><p>A\u00a0pressure\u00a0class\u00a0alone\u00a0does\u00a0not\u00a0define\u00a0a\u00a0compliant\u00a0valve;\u00a0the\u00a0order\u00a0must\u00a0also\u00a0state\u00a0the\u00a0type,\u00a0material,\u00a0service\u00a0conditions,\u00a0and\u00a0governing\u00a0requirements.<\/p><\/blockquote>\n<table>\n<tbody>\n<tr>\n<td data-row=\"head\">\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442<\/td>\n<td data-row=\"head\">Main\u00a0scope<\/td>\n<td data-row=\"head\">How\u00a0it\u00a0relates\u00a0to\u00a0selection<\/td>\n<\/tr>\n<tr>\n<td data-row=\"2\">ASME\u00a0B16.34<\/td>\n<td data-row=\"2\">Broad\u00a0valve\u00a0requirements<\/td>\n<td data-row=\"2\">Ratings,\u00a0materials,\u00a0and\u00a0testing<\/td>\n<\/tr>\n<tr>\n<td data-row=\"3\">API\u00a06D<\/td>\n<td data-row=\"3\">Pipeline\u00a0valves<\/td>\n<td data-row=\"3\">Pipeline-specific\u00a0valve\u00a0requirements<\/td>\n<\/tr>\n<tr>\n<td data-row=\"4\">API\u00a0600<\/td>\n<td data-row=\"4\">Steel\u00a0gate\u00a0valves<\/td>\n<td data-row=\"4\">Requirements\u00a0for\u00a0that\u00a0valve\u00a0type<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Use\u00a0the\u00a0purchase\u00a0specification\u00a0to\u00a0turn\u00a0operating\u00a0needs\u00a0into\u00a0clear\u00a0requirements.\u00a0These\u00a0five\u00a0checks\u00a0help\u00a0connect\u00a0engineering\u00a0choices\u00a0with\u00a0supplier\u00a0documentation:<\/p>\n<ol>\n<li>Confirm\u00a0the\u00a0governing\u00a0piping\u00a0code\u00a0and\u00a0contract\u00a0edition.<\/li>\n<li>Identify\u00a0the\u00a0valve\u00a0type\u00a0and\u00a0end\u00a0connection.<\/li>\n<li>Confirm\u00a0material\u00a0and\u00a0service\u00a0conditions.<\/li>\n<li>Verify\u00a0the\u00a0pressure-temperature\u00a0rating\u00a0and\u00a0class.<\/li>\n<li>Request\u00a0test,\u00a0NDE,\u00a0and\u00a0marking\u00a0documentation\u00a0required\u00a0by\u00a0the\u00a0order.<\/li>\n<\/ol>\n<p>A\u00a0pipeline\u00a0valve\u00a0may\u00a0need\u00a0API\u00a06D\u00a0along\u00a0with\u00a0broader\u00a0valve\u00a0requirements.\u00a0A\u00a0steel\u00a0gate\u00a0valve\u00a0may\u00a0call\u00a0for\u00a0API\u00a0600.\u00a0Send\u00a0the\u00a0purchase\u00a0specification\u00a0and\u00a0full\u00a0operating\u00a0conditions\u00a0to\u00a0the\u00a0responsible\u00a0engineering\u00a0review,\u00a0with\u00a0documentation\u00a0requirements\u00a0stated\u00a0before\u00a0procurement.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Compliance\u00a0starts\u00a0by\u00a0matching\u00a0the\u00a0valve\u00a0to\u00a0<em>both<\/em>\u00a0the\u00a0standard\u2019s\u00a0limits\u00a0and\u00a0the\u00a0project\u00a0requirements.\u00a0A\u00a0rating\u00a0is\u00a0useful\u00a0only\u00a0after\u00a0you\u00a0confirm\u00a0the\u00a0valve\u00a0falls\u00a0within\u00a0scope\u00a0and\u00a0the\u00a0stated\u00a0service\u00a0conditions\u00a0match\u00a0its\u00a0permitted\u00a0use.<\/p>\n<p><strong>Put\u00a0the\u00a0required\u00a0edition\u00a0and\u00a0supporting\u00a0project\u00a0standards\u00a0in\u00a0the\u00a0purchase\u00a0documents.<\/strong>\u00a0Have\u00a0the\u00a0responsible\u00a0engineer\u00a0review\u00a0the\u00a0completed\u00a0specification\u00a0before\u00a0you\u00a0issue\u00a0an\u00a0order.\u00a0Include\u00a0the\u00a0operating\u00a0conditions\u00a0and\u00a0required\u00a0documentation,\u00a0then\u00a0confirm\u00a0each\u00a0is\u00a0stated\u00a0clearly\u00a0in\u00a0the\u00a0purchase\u00a0specification\u00a0before\u00a0procurement.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Does_Class_150_mean_a_valve_is_rated_for_150_psi_at_every_temperature\"><\/span>Does\u00a0Class\u00a0150\u00a0mean\u00a0a\u00a0valve\u00a0is\u00a0rated\u00a0for\u00a0150\u00a0psi\u00a0at\u00a0every\u00a0temperature?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<section>No.\u00a0A\u00a0Class\u00a0150\u00a0valve\u2019s\u00a0allowable\u00a0pressure\u00a0depends\u00a0on\u00a0its\u00a0material\u00a0and\u00a0operating\u00a0temperature.\u00a0For\u00a0ASTM\u00a0A106\u00a0Grade\u00a0C,\u00a0the\u00a0rating\u00a0is\u00a0260\u00a0psig\u00a0at\u00a0200\u00b0F\u00a0and\u00a095\u00a0psig\u00a0at\u00a0750\u00b0F.\u00a0The\u00a0class\u00a0number\u00a0is\u00a0not\u00a0a\u00a0fixed\u00a0pressure\u00a0limit\u00a0in\u00a0psi.\u00a0Use\u00a0the\u00a0applicable\u00a0rating\u00a0information\u00a0for\u00a0the\u00a0exact\u00a0material\u00a0and\u00a0temperature\u00a0in\u00a0your\u00a0service\u00a0conditions.<\/section>\n<h3><span class=\"ez-toc-section\" id=\"Can_a_flanged_valve_be_Class_4500_under_ASME_B1634\"><\/span>Can\u00a0a\u00a0flanged\u00a0valve\u00a0be\u00a0Class\u00a04500\u00a0under\u00a0ASME\u00a0B16.34?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<section>No.\u00a0Under\u00a0the\u00a0stated\u00a0scope,\u00a0Class\u00a04500\u00a0applies\u00a0only\u00a0to\u00a0welding-end\u00a0valves.\u00a0Flanged-end\u00a0valves\u00a0are\u00a0limited\u00a0to\u00a0standard\u00a0class\u00a0ratings.\u00a0A\u00a0flanged\u00a0valve\u00a0does\u00a0not\u00a0become\u00a0eligible\u00a0for\u00a0Class\u00a04500\u00a0because\u00a0its\u00a0material\u00a0or\u00a0size\u00a0resembles\u00a0a\u00a0welding-end\u00a0valve.\u00a0Check\u00a0the\u00a0connection\u00a0type\u00a0and\u00a0scope\u00a0limits\u00a0before\u00a0using\u00a0a\u00a0class\u00a0rating\u00a0in\u00a0the\u00a0purchase\u00a0specification.<\/section>\n<h3><span class=\"ez-toc-section\" id=\"Does_every_ASME_B1634_valve_require_NDE\"><\/span>Does\u00a0every\u00a0ASME\u00a0B16.34\u00a0valve\u00a0require\u00a0NDE?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<section>No.\u00a0Special\u00a0Class\u00a0threaded-end\u00a0or\u00a0welding-end\u00a0valves\u00a0have\u00a0additional\u00a0NDE\u00a0requirements\u00a0beyond\u00a0Standard\u00a0Class.\u00a0The\u00a0requirement\u00a0does\u00a0not\u00a0apply\u00a0identically\u00a0to\u00a0every\u00a0class.\u00a0NDE\u00a0may\u00a0include\u00a0radiographic\u00a0or\u00a0ultrasonic\u00a0examination,\u00a0depending\u00a0on\u00a0the\u00a0applicable\u00a0requirements.\u00a0Check\u00a0the\u00a0class\u00a0designation\u00a0and\u00a0purchase\u00a0documents\u00a0to\u00a0determine\u00a0which\u00a0examinations\u00a0and\u00a0records\u00a0the\u00a0ordered\u00a0valve\u00a0needs.<\/section>\n<h3><span class=\"ez-toc-section\" id=\"What_does_a_B1634_marking_on_a_valve_confirm\"><\/span>What\u00a0does\u00a0a\u00a0B16.34\u00a0marking\u00a0on\u00a0a\u00a0valve\u00a0confirm?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<section>A\u00a0\u201cB16.34\u201d\u00a0marking\u00a0represents\u00a0that\u00a0the\u00a0valve\u00a0complies\u00a0with<a href=\"https:\/\/www.asme.org\/wwwasmeorg\/media\/resourcefiles\/events\/b16\/b16_brochure-180323.pdf\">\u00a0ASME\u00a0B16.34<\/a>.\u00a0It\u00a0does\u00a0not,\u00a0by\u00a0itself,\u00a0prove\u00a0that\u00a0the\u00a0valve\u00a0matches\u00a0every\u00a0project\u00a0requirement\u00a0or\u00a0that\u00a0all\u00a0required\u00a0records\u00a0have\u00a0been\u00a0supplied.\u00a0Compare\u00a0the\u00a0marking\u00a0with\u00a0the\u00a0order,\u00a0material\u00a0identification,\u00a0test\u00a0records,\u00a0and\u00a0other\u00a0required\u00a0documentation\u00a0before\u00a0accepting\u00a0the\u00a0valve.<\/section>\n<h3><span class=\"ez-toc-section\" id=\"Can_ASME_B1634_replace_API_6D_for_a_pipeline_valve\"><\/span>Can\u00a0ASME\u00a0B16.34\u00a0replace\u00a0API\u00a06D\u00a0for\u00a0a\u00a0pipeline\u00a0valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<section>No.\u00a0API\u00a06D\u00a0focuses\u00a0on\u00a0pipeline\u00a0valves\u00a0and\u00a0may\u00a0add\u00a0application-specific\u00a0requirements\u00a0alongside\u00a0broader\u00a0valve\u00a0requirements.\u00a0ASME\u00a0B16.34\u00a0addresses\u00a0valve\u00a0requirements\u00a0such\u00a0as\u00a0ratings,\u00a0materials,\u00a0and\u00a0testing,\u00a0but\u00a0it\u00a0does\u00a0not\u00a0replace\u00a0a\u00a0project\u2019s\u00a0applicable\u00a0pipeline\u00a0standard.\u00a0State\u00a0the\u00a0governing\u00a0standards\u00a0in\u00a0the\u00a0purchase\u00a0documents\u00a0so\u00a0the\u00a0supplier\u00a0can\u00a0confirm\u00a0the\u00a0valve\u00a0against\u00a0each\u00a0one.<\/section>\n<h3><span class=\"ez-toc-section\" id=\"How_do_I_know_which_edition_of_ASME_B1634_to_put_in_a_purchase_order\"><\/span>How\u00a0do\u00a0I\u00a0know\u00a0which\u00a0edition\u00a0of\u00a0ASME\u00a0B16.34\u00a0to\u00a0put\u00a0in\u00a0a\u00a0purchase\u00a0order?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<section>Use\u00a0the\u00a0edition\u00a0required\u00a0by\u00a0the\u00a0contract\u00a0or\u00a0governing\u00a0project\u00a0documents.\u00a0State\u00a0that\u00a0edition\u00a0explicitly\u00a0in\u00a0the\u00a0purchase\u00a0order\u00a0rather\u00a0than\u00a0inferring\u00a0it\u00a0from\u00a0a\u00a0file\u00a0date\u00a0or\u00a0title.\u00a0A\u00a0date\u00a0in\u00a0a\u00a0document\u00a0name\u00a0may\u00a0not\u00a0identify\u00a0the\u00a0required\u00a0edition.\u00a0If\u00a0the\u00a0contract\u00a0and\u00a0project\u00a0documents\u00a0do\u00a0not\u00a0agree,\u00a0ask\u00a0the\u00a0responsible\u00a0engineer\u00a0to\u00a0resolve\u00a0the\u00a0conflict\u00a0before\u00a0procurement.<\/section>","protected":false},"excerpt":{"rendered":"<p>A\u00a0purchaser\u00a0reviewing\u00a0an\u00a0ASME\u00a0B16.34\u00a0valve\u00a0specification\u00a0must\u00a0confirm\u00a0the\u00a0equipment\u00a0can\u00a0handle\u00a0a\u00a0project\u2019s\u00a0pressure,\u00a0temperature,\u00a0and\u00a0service\u00a0conditions.\u00a0A\u00a0mismatch\u00a0can\u00a0leave\u00a0a\u00a0valve\u00a0unsuitable\u00a0for\u00a0the\u00a0piping\u00a0system,\u00a0even\u00a0if\u00a0its\u00a0nameplate\u00a0shows\u00a0a\u00a0familiar\u00a0class.\u00a0Confident\u00a0procurement\u00a0depends\u00a0on\u00a0matching\u00a0equipment\u00a0requirements\u00a0to\u00a0materials,\u00a0ratings,\u00a0inspection\u00a0needs,\u00a0and\u00a0project\u00a0documents. The\u00a0pressure-temperature\u00a0rating\u00a0is\u00a0the\u00a0maximum\u00a0pressure\u00a0permitted\u00a0for\u00a0a\u00a0specified\u00a0material\u00a0and\u00a0pressure\u00a0class\u00a0at\u00a0a\u00a0given\u00a0temperature\u00a0under\u00a0the\u00a0standard.\u00a0ASME\u00a0B16.34\u00a0is\u00a0a\u00a0technical\u00a0standard,\u00a0not\u00a0a\u00a0substitute\u00a0for\u00a0application-specific\u00a0engineering\u00a0judgment.\u00a0This\u00a0guide\u00a0helps\u00a0you\u00a0assess\u00a0its\u00a0role\u00a0in\u00a0engineering\u00a0specifications\u00a0for\u00a0industrial\u00a0piping,\u00a0then\u00a0check\u00a0the\u00a0details\u00a0that\u00a0support\u00a0a\u00a0sound\u00a0selection.\u00a0Start\u00a0by\u00a0confirming\u00a0whether\u00a0the\u00a0equipment\u00a0and\u00a0its\u00a0end\u00a0connection\u00a0fall\u00a0within\u00a0the\u00a0standard\u2019s\u00a0scope. ASME B16.34 Valve Specification: The Comprehensive Guide Key\u00a0Takeaways Check\u00a0scope\u00a0before\u00a0using\u00a0the\u00a0standard\u2019s\u00a0technical\u00a0requirements. Match\u00a0material,\u00a0pressure\u00a0class,\u00a0and\u00a0operating\u00a0temperature. Read\u00a0project\u00a0documents\u00a0for\u00a0added\u00a0requirements\u00a0and\u00a0the\u00a0required\u00a0edition. Review\u00a0testing,\u00a0inspection,\u00a0and\u00a0marking\u00a0records\u00a0against\u00a0the\u00a0order. Ask\u00a0the\u00a0responsible\u00a0engineer\u00a0to\u00a0resolve\u00a0application-specific\u00a0questions. Where\u00a0Does\u00a0ASME\u00a0B16.34\u00a0Apply,\u00a0and\u00a0Where\u00a0Does\u00a0It\u00a0Stop? ASME\u00a0B16.34\u00a0applies\u00a0to\u00a0specified\u00a0valve\u00a0constructions\u00a0and\u00a0listed\u00a0materials,\u00a0but\u00a0not\u00a0every\u00a0valve\u00a0or\u00a0operating\u00a0condition\u00a0falls\u00a0within\u00a0its\u00a0scope.\u00a0It\u00a0covers\u00a0flanged,\u00a0threaded,\u00a0and\u00a0welded-end\u00a0valves\u00a0made\u00a0from\u00a0steel,\u00a0nickel-based\u00a0alloys,\u00a0and\u00a0other\u00a0listed\u00a0materials. The\u00a0standard\u00a0addresses\u00a0pressure-temperature\u00a0ratings,\u00a0dimensions,\u00a0tolerances,\u00a0materials,\u00a0NDE,\u00a0testing,\u00a0and\u00a0marking.\u00a0Outside\u00a0the\u00a0stated\u00a0scope,\u00a0do\u00a0not\u00a0assume\u00a0ASME\u00a0B16.34\u00a0supplies\u00a0a\u00a0rating\u00a0for\u00a0your\u00a0case.\u00a0Check\u00a0the\u00a0connection,\u00a0size,\u00a0material,\u00a0and\u00a0class\u00a0limits\u00a0before\u00a0relying\u00a0on\u00a0its\u00a0requirements. Outside\u00a0the\u00a0stated\u00a0scope,\u00a0do\u00a0not\u00a0assume\u00a0ASME\u00a0B16.34\u00a0supplies\u00a0a\u00a0rating\u00a0for\u00a0your\u00a0case. Valve\u00a0types\u00a0and\u00a0end\u00a0connections\u00a0covered Flanged,\u00a0threaded,\u00a0and\u00a0welding-end\u00a0valves\u00a0are\u00a0addressed,\u00a0subject\u00a0to\u00a0specific\u00a0limits.\u00a0The\u00a0standard\u00a0also\u00a0sets\u00a0valve\u00a0dimensions\u00a0and\u00a0tolerances,\u00a0alongside\u00a0material,\u00a0examination,\u00a0test,\u00a0and\u00a0marking\u00a0requirements.\u00a0Readers\u00a0searching\u00a0for\u00a0ASME\u00a016.34\u00a0may\u00a0see\u00a0that\u00a0shortened\u00a0form,\u00a0but\u00a0ASME\u00a0B16.34\u00a0is\u00a0the\u00a0standard\u2019s\u00a0correct\u00a0designation. Use\u00a0this\u00a0quick\u00a0checklist\u00a0before\u00a0applying\u00a0the\u00a0standard\u2019s\u00a0requirements: End\u00a0connection:\u00a0flanged,\u00a0threaded,\u00a0or\u00a0welding-end. Material\u00a0family:\u00a0steel,\u00a0nickel-based\u00a0alloy,\u00a0or\u00a0another\u00a0listed\u00a0material. Nominal\u00a0size:\u00a0flanged\u00a0valves\u00a0larger\u00a0than\u00a0NPS\u00a060\u00a0are\u00a0outside\u00a0the\u00a0stated\u00a0scope. Class\u00a0or\u00a0temperature\u00a0limit:\u00a0confirm\u00a0the\u00a0applicable\u00a0boundary\u00a0below. Scope\u00a0limits\u00a0that\u00a0can\u00a0rule\u00a0out\u00a0an\u00a0application Class\u00a04500\u00a0applies\u00a0only\u00a0to\u00a0welding-end\u00a0valves.\u00a0Threaded-end\u00a0valves\u00a0above\u00a0Class\u00a02500\u00a0or\u00a0with\u00a0temperature\u00a0ratings\u00a0above\u00a01000\u00b0F\u00a0are\u00a0outside\u00a0the\u00a0stated\u00a0scope.\u00a0Flanged-end\u00a0valves\u00a0are\u00a0limited\u00a0to\u00a0standard\u00a0class\u00a0ratings\u00a0under\u00a0the\u00a0scope. 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