The sealing principle of floating ball valve and fixed ball valve

The ball of the floating ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end. The ball of the fixed ball valve is fixed and does not move after being pressed. The fixed ball valve has a floating valve seat. After being pressurized by the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure sealing. Usually, bearings are installed on the upper and lower shafts offset from the ball, and the operating torque is small, suitable for high pressure and large diameter valves.