DBB Forged Double Block and Bleed Ball Valve: Definition, Features, Parameters & Applications

1. Definition of DBB Forged Double Block and Bleed Ball Valve

The "Double Block and Bleed Isolation Principle" requires two isolating valves in series and one bleed valve, which are used to discharge or drain the trapped fluid between the two closing elements, so as to safely isolate the downstream pipeline. This function can be realized by a single valve with a bleed port, which is located between the two valve plugs.

2. Structural Features of DBB Forged Double Block and Bleed Ball Valve

• Space and Weight Saving

• Cost Saving (Product and Installation)

• Minimized Leakage Paths

• Enhanced Pipeline Structural Integrity

• Supports ESDV (Emergency Shutdown Valve) + MOV (Motor-Operated Valve) or ESDV + XV (On-Off Valve) Configurations

• Improved System Reliability

• Anti-Ejection/Low-Emission Stem Design

• Fire-Safe and Anti-Static Design

• Independent Balls and Valve Stems

• Self-Centering Trim

• Self-Bleeding/Double Piston Effect

• Floating Valve Seats

• Soft Sealing or Metal Sealing

3. Technical Parameters of DBB Forged Double Block and Bleed Ball Valve

• Design Standards: API 6D, ASME B16.34, ISO 14313, ISO 17292, GB/T 12237

• Pressure-Temperature Rating: ASME B16.34, GB/T 12224

• Face-to-Face Dimensions: ASME B16.10, GB/T 12221, EN 558

• Flanged Ends: ASME B16.5, GB/T 9113, JB/T 79, HG/T 20592, EN 1092, GOST

• Welded Ends: ASME B16.25, GB/T 12224, ASME B16.11

• Fire-Safe Requirements: API 6FA, API 607

• Pressure Testing: API 598, API 6D, GB/T 13927, JB/T 9092, GOST 9544

• Body Materials: Carbon Steel, Stainless Steel, Alloy Steel

• Nominal Size: NPS 2"~60", DN 50~1500

• Pressure Range: Class 150~2500, PN 10~420

• Operating Temperature: -60°C~+250°C

• Actuation Methods: Manual, Electric, Pneumatic, etc.

4. Application Scope

It is suitable for switching the medium flow direction and diverting or mixing the medium in pipeline systems of water supply, petrochemical, metallurgy, mining, light industry and textile, energy, paper making, food, iron and steel industries, etc.