Ball Valves
Double Block & Bleed Trunnion Mounted Ball Valve
Two independent seats with a body bleed provide positive double isolation in a single valve for maintenance safety and metering applications.
Overview
A Double Block & Bleed (DBB) trunnion mounted ball valve is a powerful and secure valve designed for critical applications requiring high pressure, positive isolation, and minimal leakage.
Key features
- Positive Isolation: The DBB design allows for complete shutoff of flow in both directions, critical for maintenance and safety procedures.
- Bleed Port: The central bleed port enables venting or draining of trapped fluids between the valves for safety checks, purging, or maintenance.
- High Pressure and Temperature Rating: The robust construction and trunnion mounted design enable handling high pressures and temperatures.
- Leak-Proof Performance: Double isolation and high-quality seating minimize leakage risks.
- Easy Maintenance: The modular design allows for individual valve maintenance without disrupting the entire piping system.
- Versatility: Available in various sizes and materials to suit diverse industrial applications.
- Bidirectional Flow: Each valve section can allow flow in either direction, offering flexibility in piping layouts.
Technical specifications
- Size Range
- 2 – 24 NPS, DN50 - DN600
- Body Materials
- ASTM A216, A105, A350, A182, A351, A352, A890, A995.
- Temperature Range
- -29°C to 450°C
- Ball Materials
- ASTM A216, A105, A350, A182, A351, A352, A890, A995.
- Maximum Allowable Operating Pressure
- ANSI 150#, ANSI 300#, ANSI 600# , ANSI 900#, ANSI 1500#, ANSI 2500#
- Seat Materials
- PTFE, NYLON, PEEK, NBR, KELF, ENP (Electroless nickel plating), HC (Hard chrome).
- Shutoff Rating
- Bidirectional Bubble-tight
- Body Style
- Flanged End, Butt Weld, FE V/s BW
- Design Standard
- API 6D, ASME 16.34
- Flange Drilling
- ASME B16.5
- Testing Standard
- API 598, ISO 5208, EN 12266-1
- Face To Face
- ASME B16.10
- Applications
- Oil & Gas, Wastewater, Seawater, Petrochemicals
Applications
- Oil & Gas
- Wastewater
- Seawater
- Petrochemicals
Benefits
- Enhanced Safety: DBB functionality provides a higher level of safety during maintenance or emergencies by ensuring complete isolation.
- Reduced Downtime: Isolating one valve section allows for maintenance on the other section without shutting down the entire process line.
- Minimized Fugitive Emissions: Leak-proof design helps reduce environmental impact.
- Long Service Life: Durable construction and ease of maintenance contribute to a long lifespan.
- Reliable Flow Control: Double isolation and tight seating ensure precise flow control.
Frequently asked questions
- **Double block and bleed functionality:** Provides superior isolation and safety for maintenance or emergencies.
- **Enhanced leak-proof performance:** Minimizes fugitive emissions.
- **Higher initial cost:** Due to the complex design and double isolation features.
- **Increased maintenance complexity:** Two valve sections require maintenance compared to a single valve.
- **Single trunnion mounted ball valve with block and bleed:** Offers some isolation capability but not double block and bleed.
Application engineering
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