Trunnion ball valve

Trunnion Ball Valve – Anchored Ball for Large Diameter Service

Trunnion Ball Valves feature a ball mechanically anchored by top and bottom trunnions (support bearings), rather than floating between seats. This trunnion-mounted design eliminates seat loading from line pressure, dramatically reducing operating torque—essential for large diameter (DN 150+ / 6″+) and high-pressure applications.

The anchored ball transfers pressure loads to the trunnion bearings instead of the seats, enabling larger valve sizes and higher pressure classes while maintaining reasonable actuator requirements. Spring-loaded or pressure-energized seats maintain contact with the ball surface regardless of line pressure, ensuring bidirectional sealing.

Our Trunnion Ball Valve range serves critical pipeline isolation across African oil & gas infrastructure, from Trans-Saharan transmission systems to offshore export terminals. The anchored ball, DN 150+, high pressure, lower torque capabilities make these essential for applications where floating ball designs become impractical due to size or pressure constraints.