A Cast Gate, Globe, Check Valvestrunnion mounted valve means that the ball is constrained by bearings and is only allowed to rotate. The bearings act on the trunions which may integral to the forged Gate, Globe, Check Valvesball, or may be separate depending on the valve design. The key feature is Ball Valves Resilient Seated Gate Valvesline pressure forces the upstream seat onto the ball to cause it to seal. As the Automatic Control Valvesarea on which the pressure acts is much lower, the amount of force exerted on the ball is much less, leading to lower friction values and smaller actuators or gear boxes.

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