A double block and bleed (DBB) ball valve is a high-integrity isolation assembly that integrates two independent inline seals and a central venting mechanism into a single, compact body. Designed to replace bulky multi-valve hooks, this configuration utilizes dual inline balls or specialized double-sealing trunnion seats to isolate upstream and downstream fluid pressures simultaneously. By facilitating secure, verifiable isolation, DBB assemblies protect personnel during line maintenance and prevent fluid cross-contamination. Engineered to standards like API 6D and ASME B16.34, they are critically specified across high-pressure gas distribution networks, offshore manifolds, and refinery storage systems. Sourcing managers and piping engineers can maximize pipeline safety and reduce installation weights by importing API 6D certified double block and bleed ball valves directly from elite manufacturers in China via our B2B commercial platform.
