Description

DBB Ball Valve, known for its double block and bleed (DBB) functionality, operates on a robust mechanism involving two sealing slides on the plug, which ensure double shutting and draining capabilities. This valve design is particularly effective in managing flow control and providing safety in critical applications.

1. Parameter

2. Advantages of DBB Ball Valves

1. Bidirectional Sealing
   Provides reliable isolation in both upstream and downstream directions, ensuring system integrity under high-pressure or high-temperature conditions.

2. Space and Cost Efficiency
   Replaces multiple valve arrangements with a single compact unit, reducing installation footprint, complexity, and overall cost.

3. Zero Leakage
   Prevents any fluid passage from upstream to downstream, critical for safety, environmental protection, and operational reliability.

4. Seal Integrity Verification
   Allows for testing of the seal performance between block functions, ensuring reliability before and during operation.

5. Safe Maintenance and Bleeding
   Envents pressure between seals to be safely bled off, facilitating secure maintenance, inspection, or system checks without full shutdown.

6. Suitability for Critical Services
   Ideal for use in oil and gas, LNG, petrochemical, and other high-risk applications where leakage is unacceptable.

   

3. Applications of DBB Valves

1. Critical Pipeline Section Isolation
DBB valves, such as double expansion gate valves, are used to isolate pipeline segments in liquid service—especially near environmentally sensitive or urban areas—providing reliable mechanical sealing on both upstream and downstream sides regardless of pressure or vibration.

2. Instrument Calibration and Metering Systems
DIB and DBB ball valves are essential in calibration loops for flow meters and transmitters. Their leak-tight seals prevent even minor leakage, ensuring measurement accuracy and avoiding costly recalibration or product loss.

3. Maintenance and Safety During Operations
Both valve types allow safe maintenance and bleeding of pipeline sections under pressure. They support blowdown, pigging, and emergency shutdown procedures while minimizing product loss and environmental risk.

4. Block Valve Stations in Transmission Lines
Installed in block valve stations along transmission pipelines, DIB and DBB valves enhance sectional isolation capability, limiting release volume in case of failure and improving overall pipeline integrity management.