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Trunnion Mounted Ball Valve

Twin Isolation

A twin isolation trunnion mounted ball valve is a robust and versatile valve designed for superior flow control and isolation in demanding industrial applications.
Twin Isolation Ball Valve


Trunnion Mounted Ball Valve - Twin Isolation
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


Oil & Gas, Wastewater, Seawater, Petrochemicals

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


  1. Enhanced Safety: Double block and bleed functionality provides a higher level of safety during maintenance or in case of leaks.
  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.


    • 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.
    • 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.
    • 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.