The Double Block & Bleed (DBB) Ball Valve is a specialized valve designed to provide a high level of safety and reliability in piping systems. It features two independent sealing surfaces (the "double block") that prevent the flow of media in either direction, along with a bleed port that allows for the safe venting of trapped fluids between the two sealing surfaces. This design is particularly useful in applications where the isolation of a section of the pipeline is required for maintenance or safety reasons, ensuring that the system can be safely drained or vented.

Standard

• SIZE:1/2" - 8" NPS
• CLASS:150 - 2500LB
• Design:ASME B16.34 and EEMUA 182 (if applicable), ISO 17292, API 608, API 6D
• Inspection & testing:API 598
• Marking:MSS SP-25
• Fugitive emission:ISO 15848
• Face to face:Manufacturer Standard
• Socket weld:ASME B16.11
• Screwed ends (NPT):ASME B1.20.1
• Flanged ends:ASME B16.5
• Butt welding ends:ASME B16.25

Design Features

• Floating or trunnion mounted ball valves in main bore, each valve is bi-directional and designed for full differential pressure at ambient and low temperature. For main bore valve general features see the ball valve sections (floating ball or trunnion ball).
• Full die forged structure for all pressure containing parts.
• Integral body comprising of two ball valves through main bore with a needle bleed valve from the cavity between the two ball valves. Housing design can be split body or end entry (end entry cannot be feasible for all range).
• Standard primary gasket design is Lip-Seal type, secondary emergency seal always provided for fire-safe purpose.
• High quality sealing products and reduced leakage points.
• Improved safety in operations, space and weight.
• Compact design.
• Uninterrupted flow for negligible pressure drop.
• Reduced stresses from loading and vibration.
• Designed and engineered on a case-by-case basis.