18061659285
China Twin Ball DBB Trunnion-Mounted Ball Valve with Worm Gear - Reliable Suppliers & Factory Solutions
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
What is a Twin Ball DBB (Double Block and Bleed) valve and how does it work?
⌄
A Twin Ball DBB valve features two trunnion-mounted balls with a central bleed cavity between them. It provides double isolation by blocking flow from both upstream and downstream simultaneously, while the central bleed port allows safe pressure release and leakage monitoring, making it ideal for high-risk media handling.
What safety certifications and features does this valve include?
⌄
The valve is engineered with fire-safe design (compliant with API 607 / API 6FA standards), anti-static protection to prevent spark ignition, and an anti-blowout stem to secure the stem under pressure. These features ensure safe and reliable operation in high-pressure and hazardous environments.
What materials are used in the valve body construction?
⌄
The valve body is constructed from forged steel, which provides superior strength and resistance to high-pressure and high-temperature conditions. The robust trunnion support structure further enhances structural integrity for demanding industrial applications.
Can the twin balls be operated independently?
⌄
Yes. The twin balls can be operated either independently or synchronously depending on the application requirement. This flexibility supports dual-line flow control, flow merging, or emergency shut-off functions, offering versatile process management in complex pipeline systems.
How does the worm-gear drive benefit valve operation?
⌄
The worm-gear drive mechanism significantly reduces the operating torque required to turn the valve, making manual control easier and less physically demanding. This is especially beneficial in large-diameter or high-pressure applications where direct handle operation would otherwise require excessive force.
What industries and applications is this Twin Ball DBB valve suitable for?
⌄
This valve is widely used in oil and gas pipelines, petrochemical plants, refineries, LNG facilities, and other high-pressure industrial systems where safe isolation, leakage prevention, and reliable shut-off of hazardous or flammable media are critical requirements.