{"id":5937,"date":"2024-07-31T22:35:25","date_gmt":"2024-07-31T22:35:25","guid":{"rendered":"https:\/\/sinovalveco.com\/?post_type=product&p=5937"},"modified":"2026-04-18T08:31:14","modified_gmt":"2026-04-18T08:31:14","slug":"double-block-and-bleed-valve","status":"publish","type":"product","link":"https:\/\/ntgdvalve.com\/fr\/double-block-and-bleed-valve\/","title":{"rendered":"Vanne double de blocage et de purge (DBB)"},"content":{"rendered":"

By Bruce Tseng, Valve Engineer at NTGD Valve<\/strong>
Technically reviewed by NTGD Engineering Team<\/strong>
Last updated: March 2026<\/strong><\/p>\n

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A Double Block and Bleed Valve (DBB valve)<\/strong> is used when a system needs two sealing barriers with a bleed point between them<\/strong> so that pressure can be isolated, the cavity can be vented, and seat integrity can be verified before maintenance, testing, or shutdown work begins.<\/p>\n

In real projects, DBB valves, often configured within the broader ball valve<\/strong><\/a> family for isolation service, are not selected just because they are compact. They are selected because they can help reduce leak paths, simplify piping, improve maintenance safety, and save space compared with traditional multi-valve assemblies. That said, one of the most common and most expensive mistakes in the field is treating DBB<\/strong> and DIB<\/strong> as if they are automatically interchangeable. They are not.<\/p>\n

For engineers, EPC contractors, and industrial buyers, the practical questions are usually these:<\/p>\n