In the high-stakes environment of fluid transport and processing, the Double Block and Bleed (DBB) Ball Valve is not merely a component—it is a critical safety instrument. Engineered to isolate two separate sections of a piping system while allowing the cavity between them to be bled, these valves effectively prevent hazardous leakage and pressure accumulation. Our expertise as premier China-based manufacturers lies in the precision integration of trunnion-mounted mechanics with high-integrity sealing, ensuring compliance with stringent API 6D and ISO international standards.
The global demand for high-pressure isolation valves has shifted from simple sourcing to partnership-based manufacturing. China’s valve industry has undergone a technological revolution, moving from mass production to specialized, high-alloy metallurgy and automated CNC precision. Our manufacturing ecosystem integrates raw forging, advanced heat treatment, and specialized coating facilities under one roof. This vertical integration allows for a 30% reduction in lead times while maintaining absolute control over the quality of ASTM A105N or stainless steel components. By leveraging this supply chain resilience, we provide global projects with not just valves, but reliable, tested assets.
In pipeline transmission, our DBB valves prevent cross-contamination and ensure safe maintenance access. We utilize metal-to-metal seating for abrasive media handling.
Operating at -196℃, our cryogenic DBB designs utilize specialized austenitic stainless steel and extended bonnet designs to ensure stem sealing integrity in extreme cold.
With the global push for renewable energy, our R&D focus is on hydrogen-ready valves. We utilize specific coatings and elastomer seals that resist hydrogen embrittlement.
The future of the valve industry is defined by Industry 4.0 integration. We are currently implementing smart valve technology, including:
A Double Block and Bleed valve provides two independent seating surfaces and a bleed valve between them. This allows the user to verify the seal integrity of both seats individually, ensuring zero-leakage safety for maintenance workers downstream.
Top-tier manufacturers in China now adhere to international standards such as API 6D, API 607 (Fire Safe), and CE/PED certifications. We conduct rigorous pressure tests (hydrostatic and pneumatic) on every single valve before shipping.
Due to our integrated supply chain in China, we can expedite forging and machining. Depending on the size (e.g., 2" to 48") and material, typical production cycles range from 4 to 8 weeks, significantly faster than Western counterparts.
Shoulong Valve
