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China Suppliers Factory Twin Ball DBB Trunnion-Mounted Ball Valve with Worm Gear for Leak-Free Operation
Key Features
Twin Ball DBB Design
Dual trunnion-mounted balls with central bleed provide double block-and-bleed isolation, safe pressure release, and leakage monitoring for high-risk media.
Enhanced Safety Features
Engineered with fire-safe, anti-static, and anti-blowout stem design, ensuring reliable operation under high-pressure and hazardous conditions.
Heavy-Duty Body & Support
Forged steel body with robust trunnion support handles high-pressure, high-flow applications, delivering long-term durability and stable performance.
Versatile Control & Easy Operation
Twin balls can be operated independently or synchronously, supporting dual-line flow, merging, or emergency shut-off, while worm-gear drive reduces torque for easier manual control.
Frequently Asked Questions
Q
What is the Twin Ball DBB (Double Block and Bleed) design and how does it work?
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The Twin Ball DBB design incorporates two trunnion-mounted balls with a central bleed cavity between them. This configuration creates two independent sealing points, allowing operators to safely isolate pressure from both upstream and downstream directions simultaneously. The central bleed port enables pressure verification and controlled release, making it especially effective for handling high-risk media in critical pipeline systems.
Q
What safety certifications or standards does this valve comply with?
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The valve is engineered to meet industry-recognized safety standards, including fire-safe design requirements per API 607 / ISO 10497, anti-static testing per API 6D, and anti-blowout stem protection. These features ensure the valve maintains structural integrity and safe functionality under extreme temperatures, high-pressure conditions, and hazardous media exposure.
Q
What pressure and temperature ratings does the heavy-duty forged steel body support?
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The heavy-duty forged steel body with robust trunnion support is designed to handle high-pressure, high-flow pipeline applications. Specific pressure and temperature ratings depend on the valve class and material selection. Typically, these valves are available in ANSI Class 150 to 2500 ratings, accommodating a wide range of operating temperatures from cryogenic to elevated heat service environments.
Q
Can the twin balls be operated independently for different flow control scenarios?
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Yes. The twin ball configuration supports both independent and synchronous operation. This versatility allows the valve to handle a variety of scenarios, including dual-line flow control, flow merging or splitting, and rapid emergency shut-off. The worm-gear actuator further reduces the required operating torque, making manual control straightforward even under high differential pressure conditions.
Q
In which industries or applications is this twin ball DBB valve commonly used?
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Twin ball DBB valves are widely used in the oil and gas sector, petrochemical plants, natural gas transmission, offshore platforms, and chemical processing facilities. They are particularly suited for applications involving toxic, flammable, or corrosive media where a single valve seal is insufficient and regulatory requirements mandate double isolation with bleed verification.
Q
What maintenance or inspection procedures are recommended for this valve?
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Routine maintenance includes periodic inspection of the central bleed port to verify seal integrity, checking anti-static bonding continuity, and lubricating the worm-gear drive mechanism. The trunnion-mounted design allows for in-line seat maintenance without full valve removal. It is recommended to follow the manufacturer's maintenance schedule and applicable pipeline safety regulations to ensure long-term, reliable performance.