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.

CategorySpecifications
Body MaterialLTCS / CS, Stainless Steel, Duplex, Super Duplex, 6MO, Titanium, Nickel Alloys
SealsSoft Seated, Metal Seated
Design StandardsAPI 6D, ASME B16.34, EN 12516, ISO 17292, API 607, API 6FA, NACE MR 01-75
Size RangeDN50 (2”) – DN400 (16”)
Connection TypeFlanged, Clamped Hubs, Butt Weld End
Pressure ClassANSI 150# – 2500#
Operation / ActuationWorm 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
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