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Compact Twin-Ball Double Block and Bleed Valve with Reducing Flanged Ends - China Suppliers & Factory
Key Features
Integrated Reducing Flanged Design
Unequal flange sizes allow pipeline diameter transition within the valve body, helping reduce the need for separate reducers and additional flange joints.
Twin-Ball DBB Configuration
Two independent ball closures provide upstream and downstream shut-off, while the intermediate cavity supports double block and bleed isolation requirements.
Intermediate Bleed / Drain Function
The bleed / drain connection allows cavity pressure release, draining and leakage verification before maintenance, inspection, sampling or instrument removal.
Compact Integrated Body
Compared with a traditional reducer + block valve + bleed valve assembly, the compact integrated design helps reduce installation space, component quantity, overall weight and potential external leak paths.
Dual Manual Handle Operation
Two independent handles allow separate operation of each ball closure and provide clear visual indication of open / closed position.
Project-Based Material and Configuration Options
Body material, ball material, seat material, reducing flange size, bore type, pressure class, operation method and testing requirements can be customized according to actual service conditions.
Frequently Asked Questions (FAQ)
What is the advantage of an integrated reducing flanged design?
An integrated reducing flanged design incorporates piping diameter transition directly inside the single valve body, effectively eliminating the need for standalone pipe reducers and additional flanged connections.
How does the Twin-Ball DBB configuration improve isolation safety?
It features two independent inline ball closures that provide primary and secondary block barriers, isolating high pressure from both upstream and downstream process lines securely.
What is the purpose of the intermediate bleed/drain valve?
The intermediate bleed/drain port depressurizes the cavity trapped between the two closed balls, allowing operators to verify zero leakage before initiating downstream servicing or equipment removal.
How does this compact valve reduce potential external leak paths?
By combining the functionality of two block valves, a bleed valve, and piping reducers into one single-piece cast/forged body, multiple bolted flanged joints are eliminated, minimizing fugitive emissions.
Can the materials, pressure classes, and bore sizes be customized?
Yes, full customization is available for body and trim metallurgy (such as carbon steel, stainless steel, duplex, or special alloys), pressure classes, reducing sizes, and operation methods tailored to project specifications.