Advanced Double Block and Bleed (DBB) Valves
Enhanced Safety and Reliable Isolation
Our Double Block and Bleed (DBB) valves feature two ball valves with an integrated bleed/vent function, available in split-body bolted designs with either trunnion-mounted or floating-type configurations. Valve bodies can be forged or cast, and seats are offered in soft or metal variants. Both DBB (Double Block and Bleed) and DIB (Double Isolation and Bleed) options are available, providing flexibility for your process requirements. Unlike DIB valves, DBB valves do not rely on an external mechanism to relieve pressure, ensuring simpler and safer operation.
DBB valves are ideal for critical safety applications, maintenance isolation, high-pressure systems, and hazardous fluid handling. While typically manually operated, they can also be equipped with actuators for automation.
| Category | Specifications |
|---|---|
| Body Material | LTCS / CS, Stainless Steel, Duplex, Super Duplex, 6MO, Titanium, Nickel Alloys |
| Seals | Soft Seated, Metal Seated |
| Design Standards | API 6D, ASME B16.34, EN 12516, ISO 17292, API 607, API 6FA, NACE MR 01-75 |
| Size Range | DN50 (2”) – DN400 (16”) |
| Connection Type | Flanged, Clamped Hubs, Butt Weld End |
| Pressure Class | ANSI 150# – 2500# |
| Operation / Actuation | Worm Gear, Pneumatic Actuator, Electric Actuator, Hydraulic Actuator |
| Temperature Range | -46°C – 200°C |
Double isolation with two independent barriers against process fluid
Isolation verification via bleed/vent port
Reduced risk of accidental releases during maintenance
Enhanced process isolation for critical operations
In-line seat testing possible through the bleed port
Ability to depressurize trapped fluid between seals
Compact design reduces weight, space, and installation costs
Higher integrity isolation compared to a single valve
Leakage monitoring during maintenance and integrity checks
- Metering and Calibration Systems
- Refining and Transmission Pipelines
- Natural Gas Processing
- Petrochemical Plants
- Chemical Processing Facilities
- Offshore Oil & Gas Platforms
- FPSO Vessels (Floating Production, Storage, and Offloading)
- LNG Facilities
- Storage and Terminal Operations