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KSB Trunnion Mounted Ball Valve Class 150/300 Large Bore

ECOLINE BLT-S trunnion mounted design for NPS 8 and above. Ball fixed on trunnions, spring-loaded seats provide bidirectional sealing. Fire-safe API 607. WCB body, CF8M ball. Full bore available for pigging. Gear or actuator operation.

Trunnion Mounted Large BoreClass 150, 300NPS 8–16

Specifications

ParameterSpecification
SeriesECOLINE BLT-S (Trunnion)
Body MaterialA216 WCB body / A351 CF8M ball
Pressure ClassClass 150, 300
Size RangeNPS 8–16
Max Temperature200°C
Max Pressure51 bar (Class 300)
Design StandardEN ISO 17292
End ConnectionsFlanged (ASME B16.5)
ConstructionTrunnion mounted, anti-blowout stem, fire-safe API 607, spring-loaded seats
Trim / SealingPTFE spring-loaded floating seats
✓ EN ISO 17292

Material & Applications

Why Trunnion Mounted Large Bore: Trunnion mounting fixes the ball in position using upper and lower trunnion bearings. The seats are spring-loaded and float against the ball, creating bidirectional sealing. This reduces operating torque by up to 50% compared to floating ball design in the same size, allowing smaller actuators. Spring-loaded seats also compensate for seat wear over time, extending valve life.

Typical applications: Pipeline isolation, tank farm main line, oil & gas process, refinery large-bore isolation, and any application requiring low-torque operation and tight shut-off in large sizes. Full bore option for pigging and inline inspection.

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Other Variants

Flanged WCB Class 150/300 Flanged SS CF8M Class 150/300 All Ball Valves →

Service Area

Pune, Ahmednagar & Beed.

Trunnion Mounted Large Bore Ball Valve FAQs

Why trunnion instead of floating for large sizes?
Above NPS 8, the ball becomes too heavy to float freely. In a floating ball design, the upstream pressure must push the entire ball weight against the downstream seat. Trunnion mounting eliminates this by fixing the ball position and using spring-loaded seats that move independently. Result: up to 50% lower operating torque and more reliable sealing.
Can these be actuated?
Yes. Gear operation is standard for NPS 10 and above. Electric and pneumatic actuators are available for remote or automated operation. For NPS 12 and above, actuator or gear operation is typically mandatory due to high operating torque.
What is the difference between full bore and reduced bore trunnion?
Full bore: internal bore matches the pipe ID for unrestricted flow. Required when pigging tools must pass through the valve. Reduced bore: smaller bore with slight pressure drop but lower cost and weight. Most process applications use reduced bore unless pigging is required.

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