There are ball valves with floating balls or with guided balls (Trunnion). Generally there are seals made of synthetic material (for example, PTFE, Nylon, PEEK, etc.) between ball and body which are suitable for temperature ranges from -196°C to 260°C. At higher operating temperatures metallic seals are used. In the construction principle of floating balls, the ball is pressed into the opposite seat by the fluid. In the construction principle of the guided ball (TRUNNION), the ball has bearings in the body. In this case the springs are pressing the seats against the ball.
https://kihsco.eu/en/products/ball-valves/По-русски это, вроде, кран с шаром в опорах/на опоре/на цапфе.