{"id":1219,"date":"2022-08-08T15:58:26","date_gmt":"2022-08-08T07:58:26","guid":{"rendered":"https:\/\/limegreen-okapi-448594.hostingersite.com\/?page_id=1219"},"modified":"2026-07-27T16:13:42","modified_gmt":"2026-07-27T08:13:42","slug":"valve-casting","status":"publish","type":"page","link":"https:\/\/raymonvalve.com\/pt\/valve-casting\/","title":{"rendered":"Processo de Fundi\u00e7\u00e3o e Controle de Qualidade de V\u00e1lvulas"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1219\" class=\"elementor elementor-1219\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b6cddefe e-con-full e-flex e-con e-parent\" data-id=\"b6cddefe\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c3c9d85c elementor-widget elementor-widget-html\" data-id=\"c3c9d85c\" 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-1219 #content,body.page-id-1219 .site-content,body.page-id-1219 #primary,body.page-id-1219 #main,body.page-id-1219 .entry-content{margin-top:0!important;padding-top:0!important}body.page-id-1219 .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> \/ Valve Casting Process and Quality Control<\/div><div class=\"rv-kicker\" style=\"color:#f3cc18\">Cast pressure-boundary components for industrial valves<\/div><h1 class=\"rv-title\">Valve Casting: Process Control, Defect Evaluation and Traceable Evidence<\/h1><p>Valve casting converts a specified alloy into a near-net-shape body, bonnet or other component through pattern design, mold and core preparation, melting, pouring, solidification, cleaning and heat treatment. Casting quality cannot be inferred from surface appearance alone. Geometry, section transitions, feeding, chemistry, thermal history, repair controls and examination strategy influence the final component, so acceptance requires a traceable route that connects the heat, casting identity, inspections, permitted repairs and valve assembly.<\/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\">Pattern and feeding<\/span><span class=\"rv-pill\">Heat and casting identity<\/span><span class=\"rv-pill\">Defect evaluation<\/span><span class=\"rv-pill\">Repair and NDE records<\/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\">Six casting decisions that affect valve pressure-boundary confidence<\/h2><div class=\"rv-topicgrid\"><div class=\"rv-topic\"><b>Pattern, core and drawing control<\/b><p>Shrinkage allowance, machining stock, core location, draft and critical-section geometry must be based on the released component drawing. Pattern revision and condition should be controlled so dimensional changes are not introduced silently.<\/p><\/div><div class=\"rv-topic\"><b>Melt chemistry and cleanliness<\/b><p>Charge materials, alloy additions, furnace practice, deoxidation and sampling influence chemistry and inclusion risk. The heat analysis and any required product analysis need defined acceptance and traceability.<\/p><\/div><div class=\"rv-topic\"><b>Gating, feeding and solidification<\/b><p>Riser and gating choices should feed heavy sections and manage flow without creating avoidable turbulence, oxide entrainment, cold shuts or isolated shrinkage. Simulation may support decisions but does not replace inspection.<\/p><\/div><div class=\"rv-topic\"><b>Heat treatment and mechanical condition<\/b><p>The specified heat-treatment route, loading, time\/temperature control and cooling affect microstructure and properties. Furnace charts and test results must relate to the casting heat or defined production lot.<\/p><\/div><div class=\"rv-topic\"><b>Cleaning, examination and repair<\/b><p>Visual, dimensional, surface or volumetric examination is selected by material, geometry, risk and project requirements. Any permitted weld repair needs a controlled map, procedure, qualification, heat treatment and re-examination route.<\/p><\/div><div class=\"rv-topic\"><b>Identity through machining and assembly<\/b><p>Casting and heat markings must remain legible or be transferred under control after cleaning and machining. The accepted component must link to the valve serial\/tag and final material and inspection records.<\/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\">Casting indications: possible causes, evidence and disposition path<\/h2><div class=\"rv-tablewrap\"><table class=\"rv-table\"><thead><tr><th>Observed condition<\/th><th>Potential process origin<\/th><th>Evidence to examine<\/th><th>Engineering disposition<\/th><\/tr><\/thead><tbody><tr><td>Shrinkage cavity or distributed shrinkage<\/td><td>Inadequate feeding, an isolated heavy section, poor riser effectiveness or an uncontrolled solidification path<\/td><td>Component geometry, gating\/feeding plan, section map, radiography or ultrasonic results and defect location relative to machining<\/td><td>Evaluate against the applicable acceptance criteria and design significance; repair or rejection must follow an approved route rather than cosmetic blending.<\/td><\/tr><tr><td>Gas porosity or rounded internal indications<\/td><td>Moisture, gas pickup, inadequate venting, turbulent filling or melt-practice variation<\/td><td>Mold\/core records, heat data, surface and volumetric examination, distribution pattern and machining exposure<\/td><td>Confirm indication type and extent, then apply the agreed acceptance standard; do not treat every rounded indication as equivalent.<\/td><\/tr><tr><td>Inclusion, slag or oxide indication<\/td><td>Charge or refractory contamination, poor skimming, reoxidation, turbulence or entrainment during pouring<\/td><td>Melt practice, chemistry, macro\/micro examination where required, NDE morphology and defect location<\/td><td>Assess size, orientation, location and pressure-boundary relevance; investigate recurring patterns at process level.<\/td><\/tr><tr><td>Hot tear, cold crack or linear surface indication<\/td><td>Restrained contraction, section transition, mold rigidity, thermal stress, handling or heat-treatment problems<\/td><td>Magnetic-particle or liquid-penetrant results as material permits, geometry review, heat-treatment record and fracture morphology<\/td><td>Linear indications require formal evaluation to the governing criteria; removal, repair and re-examination must be fully controlled.<\/td><\/tr><tr><td>Dimensional mismatch or core shift<\/td><td>Pattern error, mold movement, core location failure, distortion or insufficient machining allowance<\/td><td>Released drawing, pattern\/core inspection, casting dimensions, machining setup and remaining-wall evaluation<\/td><td>Verify functional interfaces and minimum wall; drawing deviation requires engineering disposition, not undocumented machining compensation.<\/td><\/tr><tr><td>Evidence of weld repair<\/td><td>Removal of an accepted repairable discontinuity or unauthorized cosmetic\/process correction<\/td><td>Repair map, defect excavation record, WPS\/PQR and welder qualification where required, heat treatment and final NDE<\/td><td>Confirm repair is permitted by the material\/product\/project rules and that purchaser approval or reporting obligations were met.<\/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\">Casting evidence that answers different technical questions<\/h2><div class=\"rv-routegrid\"><div class=\"rv-route\"><b>Heat and chemistry evidence<\/b><p>Heat number, analysis results and material certificate establish the declared alloy and source lot within the agreed specification route.<\/p><\/div><div class=\"rv-route\"><b>Process-route evidence<\/b><p>Pattern revision, mold\/core controls, melt and pour records, supplier traveler and heat treatment show how the component was produced.<\/p><\/div><div class=\"rv-route\"><b>Mechanical-property evidence<\/b><p>Test coupons, heat-treatment relationship and tensile, impact, hardness or other specified results support the required material condition.<\/p><\/div><div class=\"rv-route\"><b>Examination evidence<\/b><p>Visual, dimensional and specified surface or volumetric NDE reports identify method, extent, acceptance criteria, personnel and component identity.<\/p><\/div><div class=\"rv-route\"><b>Repair evidence<\/b><p>Defect location, excavation, approved welding, heat treatment, re-examination and acceptance preserve the full history of a permitted repair.<\/p><\/div><div class=\"rv-route\"><b>Component-to-valve traceability<\/b><p>Transferred markings and assembly records connect the accepted casting to the valve serial or project tag and final manufacturing record book.<\/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>A clean surface does not prove internal soundness<\/h3><p>Grinding, shot blasting and machining can improve appearance while subsurface conditions remain. Examination method and extent must be chosen for the component geometry, material and project risk.<\/p><\/div><div class=\"rv-limit\"><h3>Not every indication is automatically a reject<\/h3><p>NDE reveals indications; the applicable method, sensitivity, acceptance standard, location and design relevance determine disposition. Acceptance cannot be invented from an image or an unrelated criterion.<\/p><\/div><div class=\"rv-limit\"><h3>Casting quality is not a blanket claim about every product<\/h3><p>Material sources, routes, examination levels and repair permissions vary. The exact foundry, qualification, records and purchaser controls for an order must be confirmed before relying on this overview.<\/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. Freeze the component requirements<\/b><span>Define material specification, drawing revision, properties, NDE extent, repair rules, traceability and purchaser intervention points.<\/span><\/div><div class=\"rv-step\"><b>2. Approve the casting route<\/b><span>Review pattern\/tooling status, method plan, qualified source and manufacturing controls appropriate to size, geometry and alloy.<\/span><\/div><div class=\"rv-step\"><b>3. Control heat, mold and pour identity<\/b><span>Record charge\/chemistry, mold\/core status, heat number, pouring details and casting identification without breaking traceability.<\/span><\/div><div class=\"rv-step\"><b>4. Heat treat and clean under control<\/b><span>Relate furnace cycles and test coupons to the correct heat or lot; preserve identity through riser removal, blasting and dressing.<\/span><\/div><div class=\"rv-step\"><b>5. Inspect, disposition and re-examine<\/b><span>Complete required visual, dimensional and NDE activities; document indications, permitted repairs, approvals and final examination.<\/span><\/div><div class=\"rv-step\"><b>6. Release to machining and final dossier<\/b><span>Verify accepted status, markings, dimensional allowance and records before machining; connect the finished component to the valve tag.<\/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>Component drawing, material specification and approved revision<\/div><div>Foundry\/source approval and applicable casting qualification requirements<\/div><div>Heat number, chemistry, certificate and product-analysis requirements<\/div><div>Heat-treatment route, furnace controls and coupon\/lot relationship<\/div><div>Visual, dimensional, surface and volumetric NDE method and extent<\/div><div>Acceptance criteria, reportable indications and inspector qualification<\/div><div>Permitted repair categories, approval points, repair map and re-examination<\/div><div>Casting-to-machined-component-to-valve traceability and final records<\/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>Technical-learning and supplier-evaluation intent for engineers and inspectors assessing how cast valve pressure-boundary components are made, what common discontinuities may mean and which records support acceptance.<\/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>Material specifications, valve product rules, casting quality requirements, NDE methods and acceptance criteria may come from different controlled documents. Their applicability, edition, examination extent and repair provisions must be stated for the exact component and order. This page does not establish an acceptance level or certify a casting source.<\/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\">Valve Casting Process and Quality Control FAQ<\/h2><div class=\"rv-faq\"><details><summary>Why are valve bodies commonly cast?<\/summary><p>Casting can produce complex internal flow passages and external pressure-boundary geometry with fewer joined sections, especially where a forged or machined route would be impractical. Suitability still depends on material, size, pressure, design, foundry control and project requirements.<\/p><\/details><details><summary>What are common defects or discontinuities in valve castings?<\/summary><p>Examples include shrinkage, gas porosity, inclusions, hot tears, cracks, cold shuts and dimensional or core-location problems. The name alone does not determine acceptance; method, size, distribution, location and the governing criteria must be evaluated.<\/p><\/details><details><summary>Can a valve casting be weld repaired?<\/summary><p>Some materials and specifications permit defined repairs under controlled procedures, qualified personnel, approvals, heat treatment and re-examination. Other applications restrict or prohibit repairs. The purchase order and applicable material\/product rules control.<\/p><\/details><details><summary>Which NDE method should be used for a valve casting?<\/summary><p>There is no universal method. Visual and dimensional inspection are foundational; liquid penetrant or magnetic particle testing can address surface-breaking indications depending on material, while radiography or ultrasonic testing can address selected internal regions. The approved specification defines method, extent and acceptance.<\/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\":\"Valve Casting Process and Quality Control\",\"item\":\"https:\/\/raymonvalve.com\/valve-casting\/\"}]},{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Why are valve bodies commonly cast?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Casting can produce complex internal flow passages and external pressure-boundary geometry with fewer joined sections, especially where a forged or machined route would be impractical. Suitability still depends on material, size, pressure, design, foundry control and project requirements.\"}},{\"@type\":\"Question\",\"name\":\"What are common defects or discontinuities in valve castings?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Examples include shrinkage, gas porosity, inclusions, hot tears, cracks, cold shuts and dimensional or core-location problems. The name alone does not determine acceptance; method, size, distribution, location and the governing criteria must be evaluated.\"}},{\"@type\":\"Question\",\"name\":\"Can a valve casting be weld repaired?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Some materials and specifications permit defined repairs under controlled procedures, qualified personnel, approvals, heat treatment and re-examination. Other applications restrict or prohibit repairs. 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The approved specification defines method, extent and acceptance.\"}}]}]<\/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>Valve casting converts a specified alloy into a near-net-shape body, bonnet or other component through pattern design, mold and core preparation, melting, pouring, solidification, cleaning and heat treatment.<\/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-1219","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/pages\/1219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/comments?post=1219"}],"version-history":[{"count":81,"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/pages\/1219\/revisions"}],"predecessor-version":[{"id":13476,"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/pages\/1219\/revisions\/13476"}],"wp:attachment":[{"href":"https:\/\/raymonvalve.com\/pt\/wp-json\/wp\/v2\/media?parent=1219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}