Trunnion Mounted Ball Valve

Double Block & Bleed

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.


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Specifications

Trunnion Mounted Ball Valve – Double Block & Bleed 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

Features:

1. Positive Isolation: The DBB design allows for complete shutoff of flow in both directions, critical for maintenance and safety procedures.
2. Bleed Port: The central bleed port enables venting or draining of trapped fluids between the valves for safety checks, purging, or maintenance.
3. High Pressure and Temperature Rating: The robust construction and trunnion mounted design enable handling high pressures and temperatures.
4. Leak-Proof Performance: Double isolation and high-quality seating minimize leakage risks.
5. Easy Maintenance: The modular design allows for individual valve maintenance without disrupting the entire piping system.
6. Versatility: Available in various sizes and materials to suit diverse industrial applications.
7. Bidirectional Flow: Each valve section can allow flow in either direction, offering flexibility in piping layouts.

Benefits:

1. Enhanced Safety: DBB functionality provides a higher level of safety during maintenance or emergencies by ensuring complete isolation.
2. Reduced Downtime: Isolating one valve section allows for maintenance on the other section without shutting down the entire process line.
3. Minimized Fugitive Emissions: Leak-proof design helps reduce environmental impact.
4. Long Service Life: Durable construction and ease of maintenance contribute to a long lifespan.
5. Reliable Flow Control: Double isolation and tight seating ensure precise flow control.

FAQs:

A. What are the advantages of using a DBB trunnion mounted ball valve compared to a standard ball valve?

• • Double block and bleed functionality: Provides superior isolation and safety for maintenance or emergencies.
  • Reduced downtime: Allows maintenance on one section without shutting down the entire process.
  • Enhanced leak-proof performance: Minimizes fugitive emissions.

B. What are some limitations of DBB trunnion mounted ball valves?

• • Higher initial cost: Due to the complex design and double isolation features.
  • Larger footprint: May require more space compared to a single ball valve.
  • Increased maintenance complexity: Two valve sections require maintenance compared to a single valve.

C. What are some alternatives to DBB trunnion mounted ball valves?

• • • Single trunnion mounted ball valve with block and bleed: Offers some isolation capability but not double block and bleed.
    • Gate valves with double block and bleed: May be a consideration but can have higher flow restriction and require more torque to operate.