{"id":4497,"date":"2026-09-16T09:24:28","date_gmt":"2026-09-16T01:24:28","guid":{"rendered":"https:\/\/www.pansvalve.com\/?p=4497"},"modified":"2026-09-24T09:26:13","modified_gmt":"2026-09-24T01:26:13","slug":"double-block-and-bleed-valve-guide","status":"publish","type":"post","link":"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/","title":{"rendered":"Double Block and Bleed (DBB) Valve: SBB vs DBB, Design &amp; Applications"},"content":{"rendered":"<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=\"\u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435\"><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' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#What_Is_a_Block_and_Bleed_Valve\" >What Is a Block and Bleed Valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#How_Does_a_Block_and_Bleed_Valve_Work\" >How Does a Block and Bleed Valve Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#What_Is_the_Difference_Between_Single_Block_and_Bleed_and_Double_Block_and_Bleed\" >What Is the Difference Between Single Block and Bleed and Double Block and Bleed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#What_Is_the_Difference_Between_DBB_and_DIB\" >What Is the Difference Between DBB and DIB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#What_Valve_Types_Are_Used_in_Block_and_Bleed_Assemblies\" >What Valve Types Are Used in Block and Bleed Assemblies?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#Where_Are_Block_and_Bleed_Valves_Required\" >Where Are Block and Bleed Valves Required?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#What_Standards_Apply_to_Block_and_Bleed_Valves\" >What Standards Apply to Block and Bleed Valves?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#How_Do_You_Select_the_Right_Block_and_Bleed_Configuration\" >How Do You Select the Right Block and Bleed Configuration?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/double-block-and-bleed-valve-guide\/#Frequently_Asked_Questions\" >\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">Three valves. One assembly. That is what a block and bleed valve does. It combines isolation and pressure venting into a single compact unit, cutting down on weight, leak points, and installation complexity. A double block and bleed adds a second independent sealing surface, with a bleed port between the two seats to safely vent cavity pressure before maintenance starts. PANS Valve manufactures ball, gate, globe, and plug valves for block and bleed configurations to API 6D and API 598 standards for oil and gas, petrochemical, instrumentation, and pipeline applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_a_Block_and_Bleed_Valve\"><\/span>What Is a Block and Bleed Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Two functions. One body. The block function stops flow and isolates a section of pipeline or equipment. The bleed function vents trapped pressure from the isolated cavity to atmosphere or a safe disposal point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In instrumentation service, block and bleed assemblies sit at the interface between the process line and measurement devices. Pressure transmitters. Gauges. Flow meters. Any device that needs to be removed from service without shutting down the entire line benefits from having a block and bleed assembly at the connection point.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_a_Block_and_Bleed_Valve_Work\"><\/span>How Does a Block and Bleed Valve Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Block first. Bleed second, always in that order.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Upstream block valve closes. Downstream section is isolated from process pressure. Second block valve closes if present, creating a sealed cavity between the two seats. Bleed valve opens. Pressure in that cavity vents safely. Now the technician can confirm both seats are holding before touching anything downstream. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The block and bleed valve diagram shows exactly this: two block valves in series, bleed valve on the cavity between them. The block and bleed valve symbol in P&amp;ID drawings uses two valve symbols in series with a vent line and a valve branching off the middle section.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_Single_Block_and_Bleed_and_Double_Block_and_Bleed\"><\/span>What Is the Difference Between Single Block and Bleed and Double Block and Bleed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below compares single block and bleed valve and double block and bleed valve configurations across key isolation criteria.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u041e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c<\/strong><\/td><td><strong>\u041e\u0434\u0438\u043d\u0430\u0440\u043d\u044b\u0439 \u0431\u043b\u043e\u043a \u0438 \u0441\u043b\u0438\u0432<\/strong><\/td><td><strong>\u0414\u0432\u043e\u0439\u043d\u0430\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0430 \u0438 \u043f\u0440\u043e\u0434\u0443\u0432\u043a\u0430<\/strong><\/td><\/tr><tr><td>Number of block seats<\/td><td>One<\/td><td>Two<\/td><\/tr><tr><td>Isolation redundancy<\/td><td>Single seat only<\/td><td>Two independent seats<\/td><\/tr><tr><td>Leak verification<\/td><td>Not possible<\/td><td>Possible via bleed valve<\/td><\/tr><tr><td>OSHA DBB compliance<\/td><td>\u041d\u0435\u0442<\/td><td>Yes with two separate valves<\/td><\/tr><tr><td>Typical application<\/td><td>Low-risk instrumentation<\/td><td>Hazardous or high-pressure service<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Single block and bleed: one seat, one bleed, basic isolation. Fine for low-risk instrumentation takeoffs. Double block and bleed: two seats, cavity bleed between them, seat leakage verification possible. Required for flammable, toxic, or high-pressure lines. OSHA DBB compliance specifically requires two separate inline valves with a bleed between them. A DBB valve built as a single body with two internal seats meets API\u2019s definition but not OSHA\u2019s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_DBB_and_DIB\"><\/span>What Is the Difference Between DBB and DIB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Same basic layout. Different sealing behaviour.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A DBB valve uses two unidirectional self-relieving seats. Each seat seals against pressure from one direction. If body cavity pressure builds beyond line pressure, the seat self-relieves back into the process. Useful in most applications. Not ideal where zero leakage is critical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A DIB valve uses bidirectional seats. Seals from both directions independently. Cannot self-relieve. Requires an external relief system to manage body cavity overpressure. DIB is the specification when fluid cleanliness or zero leakage tolerance demands a positive pressure barrier that does not communicate back to the process under any condition.<\/p>\n\n\n\n<style>\n    \/* \u5bfc\u5165 Poppins \u5b57\u4f53 *\/\n    @import url('https:\/\/fonts.googleapis.com\/css2?family=Poppins:wght@400;600;700&display=swap');\n\n    \/* \u6837\u5f0f\u9694\u79bb\uff1a\u6240\u6709\u6837\u5f0f\u90fd\u4ee5 .cldg-card- \u5f00\u5934\uff0c\u907f\u514d\u5f71\u54cd\u7f51\u7ad9\u5176\u4ed6\u90e8\u5206 *\/\n    .cldg-card-container {\n        display: flex;\n        flex-wrap: wrap;\n        width: 100%;\n        margin: 20px 0;\n        border: 1px solid #e0e0e0;\n        border-radius: 8px;\n        overflow: hidden;\n        background-color: #ffffff;\n        font-family: 'Poppins', Arial, sans-serif;\n        box-sizing: border-box;\n    }\n\n    .cldg-card-text-column {\n        flex: 55%;\n        padding: 30px;\n        display: flex;\n        flex-direction: column;\n        justify-content: center;\n        box-sizing: border-box;\n    }\n\n    .cldg-card-image-column {\n        flex: 45%;\n        min-height: 250px;\n        box-sizing: border-box;\n    }\n\n    .cldg-card-image-column img {\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n    }\n\n    .cldg-card-title {\n        font-size: 24px;\n        font-weight: 700;\n        color: #111111;\n        margin-top: 0;\n        margin-bottom: 15px;\n        line-height: 1.3;\n    }\n\n    .cldg-card-description {\n        font-size: 16px;\n        color: #444444;\n        line-height: 1.8;\n        margin-bottom: 25px;\n    }\n\n    .cldg-card-description span {\n        display: block;\n        margin-bottom: 4px;\n    }\n\n    .cldg-card-cta-button {\n        display: inline-block;\n        max-width: 220px;\n        box-sizing: border-box;\n        padding: 10px 26px;\n        font-size: 16px;\n        font-weight: 600;\n        color: #d70c19;\n        background-color: #ffffff;\n        border: 2px solid #d70c19;\n        border-radius: 5px;\n        text-decoration: none;\n        text-align: center;\n        transition: background-color 0.3s ease, color 0.3s ease;\n    }\n\n    .cldg-card-cta-button:hover {\n        background-color: #d70c19;\n        color: #ffffff;\n    }\n\n    @media (max-width: 768px) {\n        .cldg-card-container {\n            flex-direction: column;\n        }\n\n        .cldg-card-text-column,\n        .cldg-card-image-column {\n            flex: 100%;\n        }\n\n        .cldg-card-text-column {\n            padding: 25px;\n        }\n    }\n<\/style>\n\n<div class=\"cldg-card-container\">\n    <div class=\"cldg-card-text-column\">\n        <p class=\"cldg-card-title\">\u041f\u0440\u043e\u0431\u043a\u043e\u0432\u044b\u0439 \u043a\u043b\u0430\u043f\u0430\u043d DBB<\/p>\n\n        <div class=\"cldg-card-description\">\n            <span><strong>1. Structure Form:<\/strong> BC<\/span>\n            <span><strong>2. Drive Mode:<\/strong> Manual, Electric, Pneumatic<\/span>\n            <span><strong>3. Design Criteria:<\/strong> API 6D \/ API 599 \/ BS 5353 \/ GB\/T 22130<\/span>\n            <span><strong>4. Structural Length Standard:<\/strong> API 6D \/ ASME B16.10 \/ EN 558<\/span>\n        <\/div>\n\n        <a href=\"https:\/\/www.pansvalve.com\/ru\/products\/dbb-plug-valve\/\" class=\"cldg-card-cta-button\">\n            \u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e\n        <\/a>\n    <\/div>\n\n    <div class=\"cldg-card-image-column\">\n        <img decoding=\"async\" class=\"lazyload\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/01\/3-dbb-plug-valve.webp\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\u041f\u0440\u043e\u0431\u043a\u043e\u0432\u044b\u0439 \u043a\u043b\u0430\u043f\u0430\u043d DBB\"><noscript><img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/01\/3-dbb-plug-valve.webp\" alt=\"\u041f\u0440\u043e\u0431\u043a\u043e\u0432\u044b\u0439 \u043a\u043b\u0430\u043f\u0430\u043d DBB\"><\/noscript>\n    <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Valve_Types_Are_Used_in_Block_and_Bleed_Assemblies\"><\/span>What Valve Types Are Used in Block and Bleed Assemblies?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Three valve types. Different jobs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.pansvalve.com\/ru\/products\/trunnion-ball-valve\/\" data-type=\"link\" data-id=\"https:\/\/www.pansvalve.com\/products\/trunnion-ball-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0428\u0430\u0440\u043e\u0432\u044b\u0435 \u043a\u0440\u0430\u043d\u044b<\/a>. Workhorse of process block service. Double block and bleed ball valve designs with trunnion mounting and bidirectional seats are standard in oil and gas, LNG, and pipeline applications. Quick quarter-turn operation. Full bore options available. Watch for hydraulic shock risk in liquid service on rapid closure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Needle valves. Standard for the bleed port and instrumentation block positions. Gradual shutoff. No hydraulic shock. Some needle valve designs are specifically built for positive shutoff in block service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.pansvalve.com\/ru\/products\/sleeve-plug-valve\/\" data-type=\"link\" data-id=\"https:\/\/www.pansvalve.com\/products\/sleeve-plug-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u041f\u0440\u043e\u0431\u043a\u043e\u0432\u044b\u0435 \u043a\u043b\u0430\u043f\u0430\u043d\u044b<\/a>. Expanding plug designs use mechanical seat energization. No reliance on line pressure to create the seal. Preferred for demanding pipeline and storage DIB applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_Are_Block_and_Bleed_Valves_Required\"><\/span>Where Are Block and Bleed Valves Required?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-1024x576.webp\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"DBB valve applications in oil gas and petrochemical industries\" class=\"wp-image-4509 lazyload\"\/><noscript><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-1024x576.webp\" alt=\"DBB valve applications in oil gas and petrochemical industries\" class=\"wp-image-4509\" srcset=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-1024x576.webp 1024w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-300x169.webp 300w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-768x432.webp 768w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-1536x864.webp 1536w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8-18x10.webp 18w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/09\/image1-8.webp 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Four service categories. DBB is standard across all of them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Oil and gas production. Instrumentation takeoffs on hydrocarbon lines need at minimum a single block and bleed. Flammable or high-pressure service: DBB required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Petrochemical and chemical processing. Sampling points, injection connections, and measurement device interfaces on toxic or corrosive fluid lines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Offshore platforms. Space and weight matter. One integrated double block and bleed valve assembly replaces three separate valves and reduces topside weight.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pipeline systems. Mainline isolation, meter stations, and manifold valves on hydrocarbon transmission lines require DBB or DIB per API 6D.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Standards_Apply_to_Block_and_Bleed_Valves\"><\/span>What Standards Apply to Block and Bleed Valves?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.pansvalve.com\/ru\/blog\/what-is-api-6d-standard\/\" data-type=\"link\" data-id=\"https:\/\/www.pansvalve.com\/blog\/what-is-api-6d-standard\/\" target=\"_blank\" rel=\"noreferrer noopener\">API 6D<\/a> covers ball, <a href=\"https:\/\/www.pansvalve.com\/ru\/products\/wedge-gate-valve\/\" data-type=\"link\" data-id=\"https:\/\/www.pansvalve.com\/products\/wedge-gate-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0432\u043e\u0440\u043e\u0442\u0430<\/a>, check, and plug valves for pipeline service. Defines DBB and DIB capability requirements for trunnion-mounted ball valves, slab gate valves, and expanding plug valves. API 598 covers pressure testing for all valve types in block and bleed assemblies. PANS Valve manufactures to both with full material traceability and test documentation on every order.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_You_Select_the_Right_Block_and_Bleed_Configuration\"><\/span>How Do You Select the Right Block and Bleed Configuration?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Four questions. Answer all four before specifying anything.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Is the fluid flammable, toxic, or at high pressure? Yes: DBB minimum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Is zero leakage or fluid cleanliness critical? Yes: DIB specification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Is space or weight a constraint? Integrated assembly replaces three separate valves and reduces footprint and potential leak paths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Is OSHA DBB compliance required? OSHA requires two separate inline valves with a bleed between them. Single-body API DBB designs do not satisfy this requirement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PANS Valve manufactures ball, gate, <a href=\"https:\/\/www.pansvalve.com\/ru\/products\/cast-globe-valve\/\" data-type=\"link\" data-id=\"https:\/\/www.pansvalve.com\/products\/cast-globe-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0433\u043b\u043e\u0431\u0443\u0441<\/a>, and plug valves suitable for block and bleed configurations in instrumentation, process, and pipeline service. <a href=\"https:\/\/www.pansvalve.com\/ru\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact PANS Valve<\/a> for a project-specific quotation and technical selection support.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/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\n\n\n<h3 class=\"wp-block-heading\">What is the purpose of a block and bleed valve?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Isolates a pipeline section and safely vents trapped pressure from the cavity before maintenance. Replaces two block valves and one bleed valve in a single compact assembly, reducing leak points, installation space, weight, and maintenance complexity in process and instrumentation systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When should you use a double block and bleed valve?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When handling flammable, toxic, or high-pressure fluids where single isolation is insufficient. Also required where OSHA DBB compliance applies and wherever safe verification of upstream seat tightness is needed before maintenance or equipment removal begins.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is a double block and bleed ball valve?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A trunnion-mounted ball valve with two independent seating surfaces and a body cavity bleed port between them. Each seat seals independently. The bleed port allows cavity pressure to be vented and verified before the downstream section is opened for maintenance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the difference between SBB and DBB?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Single block and bleed has one isolation seat and one bleed valve. Double block and bleed has two independent seats with a bleed valve between them. DBB allows seat leakage verification and meets OSHA DBB requirements when configured as two separate inline valves with a bleed between them.<strong><\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-red-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.pansvalve.com\/ru\/contact-us\/\">\u041f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Three valves. One assembly. That is what a block and bleed valve does. It combines isolation and pressure venting into a single compact unit, cutting down on weight, leak points, and installation complexity. A double block and bleed adds a second independent sealing surface, with a bleed port between the two seats to safely vent [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4499,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[187],"tags":[],"class_list":["post-4497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plug-valve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Block and Bleed Valve: DBB, DIB, and Single Block and Bleed Explained<\/title>\n<meta name=\"description\" content=\"Block and bleed valve combines isolation and pressure venting in one unit. Single block and bleed vs double block and bleed (DBB). DBB vs DIB sealing behavior. 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Single block and bleed vs double block and bleed (DBB). DBB vs DIB sealing behavior. 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