{"id":12841,"date":"2026-04-29T15:18:23","date_gmt":"2026-04-29T07:18:23","guid":{"rendered":"https:\/\/raymonvalve.com\/?p=12841"},"modified":"2026-09-17T14:11:49","modified_gmt":"2026-09-17T06:11:49","slug":"soft-seated-vs-metal-seated-ball-valve","status":"publish","type":"post","link":"https:\/\/raymonvalve.com\/de\/blog\/soft-seated-vs-metal-seated-ball-valve\/","title":{"rendered":"Weichdichtende vs. metallisch dichtende Kugelh\u00e4hne: So w\u00e4hlen Sie die richtige Sitzkonstruktion"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"12841\" class=\"elementor elementor-12841\" data-elementor-post-type=\"post\">\n\t\t\t\t<article class=\"elementor-element elementor-element-d0db9308 e-con-full raymonvalve-blog-page rv-knowledge e-flex e-con e-parent\" data-id=\"d0db9308\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e2155283 elementor-widget elementor-widget-html\" 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a:focus-visible,.raymonvalve-blog-page summary:focus-visible,.raymonvalve-blog-page .raymonvalve-table-wrap:focus-visible{outline:3px solid #f2b84b;outline-offset:3px}.raymonvalve-blog-page .rv-button{text-align:center}.raymonvalve-blog-page .raymonvalve-table-wrap{scrollbar-gutter:stable}@media(max-width:480px){.raymonvalve-blog-page .rv-cta a.rv-button{display:block;width:100%}.raymonvalve-blog-page table{min-width:680px}}\n.raymonvalve-blog-page .rv-reading>.elementor-element+.elementor-element .rv-section{border-top:1px solid var(--rv-line)}.raymonvalve-blog-page .rv-knowledge-breadcrumb{width:min(100% - 32px,1160px);margin:0 auto;padding-top:24px;color:var(--rv-muted);font-size:.95rem}.raymonvalve-blog-page .rv-knowledge-breadcrumb span[aria-current=page]{color:var(--rv-ink)}@media(max-width:480px){.raymonvalve-blog-page .rv-knowledge-breadcrumb{width:min(100% - 22px,1160px)}}<\/style>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c24dd301 elementor-widget elementor-widget-html\" data-id=\"c24dd301\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<nav class=\"rv-knowledge-breadcrumb\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/raymonvalve.com\/knowledge-center\/\">Knowledge Center<\/a> <span aria-hidden=\"true\">&gt;<\/span> <span aria-current=\"page\">Soft Seated vs Metal Seated Ball Valve<\/span><\/nav>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-93e76cdc elementor-widget elementor-widget-html\" data-id=\"93e76cdc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<header class=\"rv-article-header\">\n    <div class=\"rv-shell\">\n      <p class=\"rv-kicker\">Knowledge Center \u00b7 Engineering Selection Guide<\/p>\n      <h1 id=\"soft-metal-seat-article-title\">Soft Seated vs Metal Seated Ball Valve: An Engineering Selection Framework<\/h1>\n      <div class=\"rv-byline\" aria-label=\"Article authorship\"><span><strong>By Raymon Valve<\/strong><\/span><span>Organization author<\/span><span>Product-neutral engineering guidance<\/span><\/div>\n      <aside class=\"rv-notice\" aria-label=\"Engineering scope notice\"><strong>Engineering scope:<\/strong> This guide supports preliminary comparison of soft-seat and metal-seat ball valve directions. It does not establish the specifications, certification, testing status, compliance status, or service suitability of any particular valve. Final selection requires complete process data, product-specific boundaries, project requirements, and responsible engineering approval.<\/aside>\n      <figure class=\"rv-hero\"><img fetchpriority=\"high\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/soft-seated-vs-metal-seated-ball-valve-hero.webp\" alt=\"Soft-seat and metal-seat interfaces shown against simplified ball surfaces\" width=\"1600\" height=\"900\" loading=\"eager\" decoding=\"async\" fetchpriority=\"high\" data-image-status=\"live-verified\" title=\"\"><figcaption>Conceptual comparison only. This is not a product drawing or supplied-valve specification.<\/figcaption><\/figure>\n    <\/div>\n  <\/header>\n\n  \t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-97d1f460 e-con-full rv-shell e-flex e-con e-child\" data-id=\"97d1f460\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-e2d23f60 e-con-full rv-reading e-flex e-con e-child\" data-id=\"e2d23f60\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d89d9795 elementor-widget elementor-widget-html\" data-id=\"d89d9795\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"rv-intro\" aria-label=\"Introduction\">\n      <p>A soft seated ball valve uses a nonmetallic seat at the primary ball-to-seat interface, while a metal seated ball valve uses metallic contact surfaces. Neither construction is universally better. The decision changes with fluid composition, solids, pressure, temperature, differential pressure, shutoff requirement, cycling, possible damage mechanisms, torque, and required evidence.<\/p>\n      <p>Use the seat label as the beginning of the review\u2014not the final selection criterion.<\/p>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51084f52 elementor-widget elementor-widget-html\" data-id=\"51084f52\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"rv-gate\" aria-labelledby=\"pre-shortlist-gate\">\n      <h2 id=\"pre-shortlist-gate\">Pre-Shortlist Decision Gate<\/h2>\n      <p>Do not shortlist a seat direction until these questions have defensible answers:<\/p>\n      <ul class=\"rv-gate-grid\">\n        <li>What function must the valve perform?<\/li><li>What are the fluid composition, phase and solids?<\/li><li>What are the normal, design and differential-pressure conditions?<\/li><li>What shutoff acceptance must be demonstrated?<\/li><li>What damage mechanisms could control the decision?<\/li><li>What product data, torque basis and documents will verify the proposal?<\/li>\n      <\/ul>\n      <p><span class=\"rv-status rv-status-open\">Open item<\/span> If any answer is missing, keep the seat decision open rather than assuming a supplier commitment.<\/p>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-40cf7ae5 elementor-widget elementor-widget-html\" data-id=\"40cf7ae5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<nav class=\"rv-toc\" aria-label=\"Table of contents\"><h2>Table of Contents<\/h2><ol><li><a href=\"#what-changes\">What changes?<\/a><\/li><li><a href=\"#comparison\">Comparison<\/a><\/li><li><a href=\"#framework\">Selection framework<\/a><\/li><li><a href=\"#failure\">Failure mechanisms<\/a><\/li><li><a href=\"#conditions\">Operating conditions<\/a><\/li><li><a href=\"#torque\">Torque and actuation<\/a><\/li><li><a href=\"#standards\">Standards<\/a><\/li><li><a href=\"#evidence\">Supplier evidence<\/a><\/li><li><a href=\"#rfq\">RFQ checklist<\/a><\/li><li><a href=\"#bid-review\">Bid normalization<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ol><\/nav>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-07ac17ad elementor-widget elementor-widget-html\" data-id=\"07ac17ad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"what-changes\" class=\"rv-section\">\n      <h2>What Actually Changes?<\/h2>\n      <p>A soft seat normally uses a polymeric or composite seat. Its behavior depends on the exact compound, geometry, support, pressure, temperature, fluid exposure, cycling and time under load.<\/p>\n      <p>A metal seat uses a metallic sealing pair. The result depends on the substrates, geometry, finish, material pairing, lapping and any coating or hardfacing\u2014not simply the words \u201cmetal seated.\u201d<\/p>\n      <p>The designation describes the primary ball-to-seat interface, not the entire valve. Stem packing, body seals, gaskets, bearings and other components can impose separate limits.<\/p>\n      <figure class=\"rv-figure\"><img loading=\"lazy\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/soft-vs-metal-ball-valve-seat-interface.webp\" alt=\"Close-up diagrams of compliant soft-seat contact and metallic seat contact against a ball\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\" data-image-status=\"live-verified\" title=\"\"><figcaption>Simplified sealing interfaces. Actual geometry and materials depend on the selected valve design.<\/figcaption><\/figure>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab06346d elementor-widget elementor-widget-html\" data-id=\"ab06346d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"comparison\" class=\"rv-section\">\n      <h2>Soft Seat vs Metal Seat Comparison<\/h2>\n      <div class=\"raymonvalve-table-wrap\" role=\"region\" aria-label=\"Seat construction comparison\" tabindex=\"0\"><table><thead><tr><th>Decision field<\/th><th>Soft-seat direction<\/th><th>Metal-seat direction<\/th><th>Verification required<\/th><\/tr><\/thead><tbody>\n        <tr><th>Primary interface<\/th><td>Nonmetallic seat against the ball<\/td><td>Metallic seat against the ball<\/td><td>Exact materials and construction<\/td><\/tr>\n        <tr><th>Leading dependencies<\/th><td>Compound, support, geometry and exposure<\/td><td>Substrates, pairing, finish and surface treatment<\/td><td>Controlled product data<\/td><\/tr>\n        <tr><th>Possible damage<\/th><td>Deformation, extrusion, cutting, chemical change or wear<\/td><td>Scoring, galling, erosion, coating damage or distortion<\/td><td>Complete service conditions<\/td><\/tr>\n        <tr><th>Solids<\/th><td>Particles may cut, embed in or deform the seat<\/td><td>Particles may trap between or damage contact surfaces<\/td><td>Size, hardness, shape, concentration and velocity<\/td><\/tr>\n        <tr><th>Shutoff<\/th><td>Not determined by seat label<\/td><td>Not determined by seat label<\/td><td>Defined criteria and valve-level evidence<\/td><\/tr>\n        <tr><th>Torque<\/th><td>Depends on load, friction, pressure, temperature and condition<\/td><td>Depends on contact, finish, pressure, temperature and condition<\/td><td>Controlled torque source and revision<\/td><\/tr>\n      <\/tbody><\/table><\/div>\n      <figure class=\"rv-figure\"><img loading=\"lazy\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/soft-vs-metal-ball-valve-comparison-matrix.webp\" alt=\"Matrix comparing the dependencies, risks and verification needs of soft and metal seats\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\" data-image-status=\"live-verified\" title=\"\"><figcaption>Visual summary only. The accessible table remains the primary comparison.<\/figcaption><\/figure>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fe433fab elementor-widget elementor-widget-html\" data-id=\"fe433fab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"framework\" class=\"rv-section\">\n      <h2>Engineering Selection Framework<\/h2>\n      <figure class=\"rv-figure\"><img loading=\"lazy\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/ball-valve-seat-selection-framework.webp\" alt=\"Flowchart for reviewing function, fluid, pressure, shutoff, product boundaries, torque and documents\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\" data-image-status=\"live-verified\" title=\"\"><figcaption>Product-neutral decision sequence\u2014not a product recommendation.<\/figcaption><\/figure>\n      <ol class=\"rv-process\">\n        <li><h3>Define the valve function<\/h3><p>Identify isolation, emergency isolation, frequent on-off, infrequent line isolation, diversion, venting, draining or another defined duty. Continuous throttling requires a separate sizing and operating review.<\/p><\/li>\n        <li><h3>Define the fluid and solids<\/h3><p>Record composition, concentration, phase, contaminants, solids, possible crystallization or fouling, cleaning media, and corrosion or erosion concerns.<\/p><\/li>\n        <li><h3>Establish the operating envelope<\/h3><p>Provide normal and design pressure and temperature, differential pressure during operation, opening and closing conditions, cycling and installation constraints. Pressure class alone is not a complete pressure-temperature boundary.<\/p><\/li>\n        <li><h3>Define shutoff acceptance<\/h3><p>Specify the test reference, project edition, medium, pressure, duration, direction and permitted leakage or other acceptance criterion. Avoid undefined expressions such as \u201czero leakage.\u201d<\/p><\/li>\n        <li><h3>Screen damage mechanisms<\/h3><p>Compare deformation, extrusion, chemical change and particle cutting with scoring, galling, erosion, coating damage, thermal movement and contamination.<\/p><\/li>\n        <li><h3>Verify the proposed construction<\/h3><p>Request product-specific seat, ball, packing and gasket data, pressure-temperature boundaries, torque basis, tests, inspection points and document requirements.<\/p><\/li>\n      <\/ol>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-24ed0f34 elementor-widget elementor-widget-html\" data-id=\"24ed0f34\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"failure\" class=\"rv-section\">\n      <h2>Failure Mechanisms and Verification<\/h2>\n      <div class=\"rv-grid rv-grid-two\"><div class=\"rv-card rv-card-soft\"><h3>Soft-seat review<\/h3><ul><li>Creep or permanent deformation<\/li><li>Extrusion into available clearances<\/li><li>Particle cutting or embedded contamination<\/li><li>Chemical swelling, softening or other change<\/li><li>Thermal movement or loss of load<\/li><li>Permeation or rapid-decompression effects<\/li><\/ul><\/div><div class=\"rv-card rv-card-metal\"><h3>Metal-seat review<\/h3><ul><li>Scoring or scratching<\/li><li>Galling between contact surfaces<\/li><li>Particle trapping or erosion<\/li><li>Coating or hardfacing damage<\/li><li>Corrosion or oxidation<\/li><li>Thermal distortion or changing torque<\/li><\/ul><\/div><\/div>\n      <figure class=\"rv-figure\"><img loading=\"lazy\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/ball-valve-seat-failure-mechanisms.webp\" alt=\"Possible soft-seat deformation and metal-seat surface-damage mechanisms\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\" data-image-status=\"live-verified\" title=\"\"><figcaption>Mechanisms to evaluate\u2014not predicted performance for a particular valve.<\/figcaption><\/figure>\n      <div class=\"raymonvalve-table-wrap\" role=\"region\" aria-label=\"Failure mechanism verification matrix\" tabindex=\"0\"><table><thead><tr><th>Review risk<\/th><th>Service data needed<\/th><th>Supplier evidence to request<\/th><th>Decision boundary<\/th><\/tr><\/thead><tbody>\n        <tr><th>Soft-seat deformation or extrusion<\/th><td>Pressure, differential pressure, temperature, dwell time and cycling<\/td><td>Exact compound, geometry, support and product boundary<\/td><td>Do not infer the limit from the material family name<\/td><\/tr>\n        <tr><th>Chemical change<\/th><td>Composition, concentration, phase, contaminants and cleaning media<\/td><td>Component-specific compatibility review<\/td><td>Material name alone is not a service guarantee<\/td><\/tr>\n        <tr><th>Particle damage<\/th><td>Size, hardness, shape, concentration, velocity and settling<\/td><td>Construction review and stated inspection\/maintenance basis<\/td><td>Neither seat direction is automatically suitable<\/td><\/tr>\n        <tr><th>Metal-surface scoring or galling<\/th><td>Material pairing, load, cycling, temperature and contamination<\/td><td>Substrates, finish, treatment process and controlled properties<\/td><td>A coating name alone is insufficient<\/td><\/tr>\n        <tr><th>Loss of shutoff<\/th><td>Required acceptance, direction, test conditions and consequences<\/td><td>Applicable procedure and valve\/order evidence<\/td><td>Seat label does not establish leakage performance<\/td><\/tr>\n      <\/tbody><\/table><\/div>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c13694e8 elementor-widget elementor-widget-html\" data-id=\"c13694e8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"conditions\" class=\"rv-section\">\n      <h2>Pressure, Temperature, Differential Pressure and Solids<\/h2>\n      <p>Temperature should not be used as a one-line rule that automatically separates soft and metal seats. For a soft-seat direction, verify the exact compound, geometry, support, time at temperature, pressure, differential pressure, cycling and chemical exposure. For a metal-seat direction, verify the full valve because packing, body seals, bearings, gaskets, coatings and clearances can remain limiting.<\/p>\n      <p>For solids-bearing media, record particle distribution, hardness, shape, concentration, settling, velocity, valve orientation, flushing and cycling. Particles can cut or embed in a soft seat, or score and separate metal contact surfaces. Depending on the duty, another valve construction may require evaluation.<\/p>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dde38b9d elementor-widget elementor-widget-html\" data-id=\"dde38b9d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"torque\" class=\"rv-section\">\n      <h2>Torque and Actuator Selection<\/h2>\n      <p>Do not assume every soft seated valve has lower torque or every metal seated valve has higher torque. Review seat preload, friction, maximum operating differential pressure, size, construction, temperature, fluid properties, surface treatment, contamination, cycling, packing friction and required operating time.<\/p>\n      <figure class=\"rv-figure\"><img loading=\"lazy\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/ball-valve-seat-torque-review-factors.webp\" alt=\"Preload, friction, pressure, temperature and operating factors affecting valve torque review\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\" data-image-status=\"live-verified\" title=\"\"><figcaption>Seat type alone cannot determine operating torque or actuator size.<\/figcaption><\/figure>\n<p>For automation, request the valve torque source and revision, maximum operating differential pressure, sizing factor, supply pressure or voltage, fail action, operating time, control mode, mounting interface and accessories. <a href=\"https:\/\/www.iso.org\/standard\/89904.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ISO 5211<\/a> addresses part-turn actuator attachment interfaces; it does not replace valve torque data or actuator sizing.<\/p>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c4b0adb6 elementor-widget elementor-widget-html\" data-id=\"c4b0adb6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"standards\" class=\"rv-section\">\n      <h2>Standards Are References, Not Product Claims<\/h2>\n      <aside class=\"rv-notice\"><strong>Reference-only boundary:<\/strong> A standard mention does not demonstrate that a valve was designed, tested, qualified, certified or documented to that standard. Confirm the project-approved edition, scope, acceptance criteria and evidence.<\/aside>\n      <div class=\"raymonvalve-table-wrap\" role=\"region\" aria-label=\"Standards reference matrix\" tabindex=\"0\"><table><thead><tr><th>Reference<\/th><th>General role<\/th><th>Does not establish here<\/th><\/tr><\/thead><tbody>\n<tr><th><a href=\"https:\/\/www.api.org\/products-and-services\/api-monogram-and-apiqr\/latest-updates\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">API 608<\/a><\/th><td>Metal ball valve product-standard reference within defined scope<\/td><td>Compliance of a particular valve<\/td><\/tr>\n<tr><th><a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-34-valves-flanged-threaded-welding-end\/2020\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ASME B16.34<\/a><\/th><td>Construction and rating reference for valves within scope<\/td><td>Seat compatibility or application suitability<\/td><\/tr>\n<tr><th><a href=\"https:\/\/www.api.org\/products-and-services\/standards\/standards-plan\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">API 598<\/a> \/ <a href=\"https:\/\/www.iso.org\/standard\/65111.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ISO 5208<\/a><\/th><td>Pressure-testing references<\/td><td>A result for the proposed product or order<\/td><\/tr>\n<tr><th><a href=\"https:\/\/www.iso.org\/standard\/78853.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ISO 10497<\/a><\/th><td>Fire type-testing reference within scope<\/td><td>Fire qualification from a metal-seat or soft-seat label<\/td><\/tr>\n      <\/tbody><\/table><\/div>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-60b6fe1e elementor-widget elementor-widget-html\" data-id=\"60b6fe1e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"evidence\" class=\"rv-section\">\n      <h2>Supplier Evidence Request Matrix<\/h2>\n      <p>Request evidence according to the decision being made. A document should not be used to prove a field outside its scope.<\/p>\n      <div class=\"raymonvalve-table-wrap\" role=\"region\" aria-label=\"Supplier evidence request matrix\" tabindex=\"0\"><table><thead><tr><th>Evidence requested<\/th><th>What it can support<\/th><th>What it does not prove by itself<\/th><\/tr><\/thead><tbody>\n        <tr><th>Controlled product datasheet<\/th><td>Proposed configuration and declared product fields<\/td><td>Order-specific acceptance or test completion<\/td><\/tr>\n        <tr><th>General arrangement drawing<\/th><td>Configuration, connections and controlled dimensions within its revision<\/td><td>Material identity or service suitability unless stated and controlled<\/td><\/tr>\n        <tr><th>BOM or component material schedule<\/th><td>Body, ball, stem, seat, packing and gasket identities<\/td><td>Compatibility with an undefined medium<\/td><\/tr>\n        <tr><th>Seat-material specification<\/th><td>Exact grade, fillers and component identity<\/td><td>A complete valve pressure-temperature boundary<\/td><\/tr>\n        <tr><th>Pressure-temperature data<\/th><td>Declared boundary for the identified construction<\/td><td>Suitability outside the stated configuration and conditions<\/td><\/tr>\n        <tr><th>Valve torque source<\/th><td>Torque basis for the identified valve and conditions<\/td><td>Actuator sizing without supply, fail action and sizing inputs<\/td><\/tr>\n        <tr><th>Test procedure and report<\/th><td>Test method and result for the stated scope<\/td><td>Other tests, qualifications or service performance<\/td><\/tr>\n        <tr><th>Qualification or certificate<\/th><td>Only the exact design, edition and extension scope shown<\/td><td>Universal compliance or every supplied configuration<\/td><\/tr>\n      <\/tbody><\/table><\/div>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d5228605 elementor-widget elementor-widget-html\" data-id=\"d5228605\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"rfq\" class=\"rv-section\">\n      <h2>RFQ Checklist<\/h2>\n      <figure class=\"rv-figure\"><img loading=\"lazy\" src=\"https:\/\/raymonvalve.com\/wp-content\/uploads\/2026\/08\/ball-valve-seat-selection-rfq-checklist.webp\" alt=\"Checklist of service, operating, shutoff, actuation and document inputs for seat selection\" width=\"1200\" height=\"900\" loading=\"lazy\" decoding=\"async\" data-image-status=\"live-verified\" title=\"\"><figcaption>Minimum project inputs for preliminary seat-construction review.<\/figcaption><\/figure>\n      <div class=\"raymonvalve-table-wrap\" role=\"region\" aria-label=\"Seat selection RFQ fields\" tabindex=\"0\"><table><thead><tr><th>Field<\/th><th>Required information<\/th><\/tr><\/thead><tbody>\n        <tr><th>Function<\/th><td>Isolation, emergency isolation, operating frequency and required direction<\/td><\/tr><tr><th>Construction<\/th><td>Floating or trunnion if known; body construction; full or reduced bore; end connection<\/td><\/tr><tr><th>Process<\/th><td>Medium, composition, concentration, phase, contaminants and solids<\/td><\/tr><tr><th>Pressure<\/th><td>Normal, design and maximum operating differential pressure<\/td><\/tr><tr><th>Temperature<\/th><td>Normal, design, upset and cycling conditions<\/td><\/tr><tr><th>Materials<\/th><td>Body, ball, stem, seat, packing, gasket and treatment requirements<\/td><\/tr><tr><th>Shutoff<\/th><td>Reference, edition, test medium, direction and acceptance criterion<\/td><\/tr><tr><th>Actuation<\/th><td>Manual\/gear\/pneumatic\/electric\/hydraulic; fail action; supply; operating time; accessories<\/td><\/tr><tr><th>Project requirements<\/th><td>Applicable standards, inspection, witness, documents, marking and spares<\/td><\/tr>\n      <\/tbody><\/table><\/div>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4b904869 elementor-widget elementor-widget-html\" data-id=\"4b904869\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"bid-review\" class=\"rv-section\">\n      <h2>Technical Bid Normalization<\/h2>\n      <div class=\"raymonvalve-table-wrap\" role=\"region\" aria-label=\"Technical bid normalization decision table\" tabindex=\"0\"><table><thead><tr><th>Status<\/th><th>Minimum condition<\/th><th>Buyer action<\/th><\/tr><\/thead><tbody>\n        <tr><th><span class=\"rv-status rv-status-ready\">Comparable<\/span><\/th><td>Same service basis, defined seat construction, matching acceptance criteria, torque basis and document scope<\/td><td>Proceed to detailed technical and commercial comparison<\/td><\/tr>\n        <tr><th><span class=\"rv-status rv-status-open\">Clarify<\/span><\/th><td>Proposal is plausible but one or more decision fields or deviations remain open<\/td><td>Issue a technical clarification list and keep the decision open<\/td><\/tr>\n        <tr><th><span class=\"rv-status rv-status-hold\">Not comparable<\/span><\/th><td>Seat label is generic, operating boundary is absent, shutoff basis differs, or required evidence cannot be tied to the proposal<\/td><td>Do not normalize price or performance until the technical basis is aligned<\/td><\/tr>\n      <\/tbody><\/table><\/div>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2dd2111e elementor-widget elementor-widget-html\" data-id=\"2dd2111e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"rv-section\">\n      <h2>Final Selection Rule<\/h2>\n      <p>Keep a soft-seat direction only when the exact nonmetallic construction can be shown to remain within the required process, pressure, temperature, solids, cycling and shutoff boundaries. Keep a metal-seat direction only when the complete sealing pair, surface engineering, other valve components, torque and acceptance criteria can be verified.<\/p>\n      <p>If neither proposal has sufficient data, keep the selection open and request the missing evidence.<\/p>\n      <div class=\"rv-related-links\" aria-label=\"Confirmed related resources\"><a class=\"rv-related-link\" href=\"https:\/\/raymonvalve.com\/ball-valves\/\">Review the Ball Valve Overview<\/a><a class=\"rv-related-link\" href=\"https:\/\/raymonvalve.com\/blog\/floating-ball-valve-vs-trunnion-ball-valve\/\">Compare Floating and Trunnion Ball Valves<\/a><\/div>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aaa0f487 elementor-widget elementor-widget-html\" data-id=\"aaa0f487\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"rv-cta\" aria-labelledby=\"decision-cta\"><h2 id=\"decision-cta\">Submit Project Data for a Seat-Selection Enquiry<\/h2><p>Provide the valve function, fluid composition, solids, normal and design pressure and temperature, maximum operating differential pressure, size, pressure class, end connection, shutoff requirement, operating frequency, actuation, project standards and document requirements.<\/p><p>Final selection remains subject to confirmation against the complete datasheet and purchase specification.<\/p><a class=\"rv-button\" href=\"https:\/\/raymonvalve.com\/contact\/\">Submit Project Information<\/a><\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-665ae4d5 elementor-widget elementor-widget-html\" data-id=\"665ae4d5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section id=\"faq\" class=\"rv-section rv-faq\"><h2>Frequently Asked Questions<\/h2>\n      <details><summary>Which leaks less: a soft seated or metal seated ball valve?<\/summary><div><p>The seat label cannot determine leakage. Compare the acceptance criterion, construction, test conditions, sealing surfaces and applicable valve-level evidence.<\/p><\/div><\/details>\n      <details><summary>Is a metal seated ball valve automatically fire safe?<\/summary><div><p>No. A metallic primary seat does not establish fire-test performance. Fire qualification is a separate design-specific requirement with its own scope and evidence.<\/p><\/div><\/details>\n      <details><summary>Is a soft seated valve always the lower-torque option?<\/summary><div><p>No. Torque depends on seat load, friction, differential pressure, temperature, construction, packing, fluid condition, cycling and contamination.<\/p><\/div><\/details>\n      <details><summary>Can seat material be selected from temperature alone?<\/summary><div><p>No. Pressure, fluid composition, solids, differential pressure, construction, exposure time, cycling, shutoff and other valve components also require review.<\/p><\/div><\/details>\n      <details><summary>Is a metal seat always suitable for abrasive media?<\/summary><div><p>No. Particles can also score metallic surfaces, damage treatments, increase torque or prevent complete closure.<\/p><\/div><\/details>\n      <details><summary>Can a standard determine the seat type?<\/summary><div><p>A standard may define product scope, construction, tests, interfaces or acceptance criteria. It does not replace process data, material review and product-specific engineering.<\/p><\/div><\/details>\n    <\/section>\n\n    \t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ecd0d4be elementor-widget elementor-widget-html\" data-id=\"ecd0d4be\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"rv-section\" aria-labelledby=\"engineering-note\"><h2 id=\"engineering-note\">Engineering Note: Assumptions and Limits<\/h2><div class=\"rv-notice\"><p><strong>Purpose:<\/strong> preliminary engineering and procurement decision support.<\/p><p><strong>Assumption:<\/strong> the comparison concerns ball valves intended primarily for isolation unless the project states otherwise.<\/p><p><strong>Limits:<\/strong> no product-specific pressure-temperature, leakage, torque, service, certification or qualification conclusion is made.<\/p><p><strong>Authorship:<\/strong> Raymon Valve is identified as the Organization author. No individual engineering credential or named technical reviewer is asserted.<\/p><p><strong>Project gate:<\/strong> the selected construction must be confirmed against the complete datasheet, purchase specification and applicable responsible-engineer review.<\/p><\/div><\/section>\n  \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Knowledge Center &gt; Soft Seated vs Metal Seated Ball Valve Knowledge Center \u00b7 Engineering Selection Guide [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":14227,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[190,1],"tags":[455,465,462,463,464,454,440,456,460,461],"class_list":["post-12841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ball-valve","category-news","tag-abrasive-service-ball-valve","tag-ball-valve-leakage-class","tag-ball-valve-seat-design","tag-ball-valve-seat-material","tag-fire-safe-ball-valve","tag-high-temperature-ball-valve","tag-metal-seated-ball-valve","tag-severe-service-ball-valve","tag-soft-seated-ball-valve","tag-soft-seated-vs-metal-seated-ball-valve"],"_links":{"self":[{"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/posts\/12841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/comments?post=12841"}],"version-history":[{"count":14,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/posts\/12841\/revisions"}],"predecessor-version":[{"id":14687,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/posts\/12841\/revisions\/14687"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/media\/14227"}],"wp:attachment":[{"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/media?parent=12841"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/categories?post=12841"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/raymonvalve.com\/de\/wp-json\/wp\/v2\/tags?post=12841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}