Products Description
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.
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
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.
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.
