AsalAra Double Block & Bleed Ball Valve
- DBB Ball Valve
The AsalAra DBB Ball Valve is designed for applications that demand redundant isolation and a safe method to bleed off pressure between sealing elements. This design provides two independent seating surfaces that isolate pressure at both ends of the valve, and a central cavity bleed system that ensures system integrity, safety, and verifiable shutoff.
Compliant with API 6D and ASME B16.34, Falcon DBB valves are available in both twin-ball design or single-body with dual-seats configurations. This product is ideal for high-stakes industries including oil & gas pipelines, metering skids, FPSOs, LNG terminals, and chemical process systems where zero leakage and verifiable isolation are critical.
NPS (inch)
DN (mm)
2” – 24”
DN 50 – DN 600
Standard
Rating
ASME
Class 150 – 2500
API
Up to 10,000 psi (optional)
- Body: ASTM A105, A350 LF2, A182 F316, F51, F55, A216 WCB, A352 LCC
- Ball: SS316 / Duplex / Inconel / ENP-coated Carbon Steel
- Seats: Soft-seated (PTFE, Devlon, PEEK), Metal-seated (Tungsten/Stellite)
- Stem: 17-4PH / SS316 / Inconel
- Bleed Valve Assembly: SS316 Needle Valve or Globe Bleed Port
- Flanged (RF/RTJ – ASME B16.5)
- Butt Weld (ASME B16.25)
- Hub-End / Clamp-End (optional for offshore)
- Threaded/BW connections for smaller sizes
- ISO 5211 mounting pad for actuators
AsalAra DBB Series
Double Block & Bleed Isolation Valves
Two Independent Seats
Ensures high-integrity double isolation
Integrated Bleed Port
Allows pressure monitoring and cavity venting
Fire-Safe & Anti-Blowout
Designed and tested to API 607 / API 6FA
Zero Leakage Capability
Designed to achieve API 6D zero leakage
Actuator Ready
ISO 5211 and customized gearbox or pneumatic actuator compatibility
Compact Design
Reduces space, weight, and potential leak paths
Self-Relieving Seats
Optional for over-pressure protection in body cavity
Fugitive Emission Control
Low-emission stem packing per ISO 15848
Pipeline isolation and sectioning
Custody transfer and metering skids
LNG & cryogenic systems
Offshore and subsea modules
Tank terminals and manifolds
Chemical injection systems
Gas compressor stations
FPSO / petrochemical skids
- Single Ball / Double Seat (DBB Function)
- Dual Ball in One Body (True DBB)
- Double Isolation and Bleed (DIB) variants
- Top-Entry or Side-Entry Construction
- Trunnion-Mounted or Floating Ball Design
- Extended Stem for buried service
- Fully welded or split-body options
- API 6D / ISO 14313
- API 6FA, API 607 Fire Safe
- ASME B16.34, B16.5, B16.10
- PED 2014/68/EU
- NACE MR0175 / ISO 15156
- ISO 15848-1 (Low Emission – optional)
AsalAra DBB Ball Valves are engineered to combine double isolation in a compact envelope, significantly reducing installation time, potential leak paths, and operational risks compared to traditional valve pairs with interconnecting spools.
AsalAra stands for engineering integrity and operational reliability. Our DBB solutions are developed with full consideration for safety, serviceability, and long lifecycle performance, making them a trusted choice for critical isolation across energy, refining, and chemical infrastructure projects worldwide.