Floating ball valve
The ball of floating ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing ring at the outlet end to ensure the sealing at the outlet end. It is a one-sided forced sealing.
The design of floating ball valve should focus on whether the sealing ring material can withstand the medium load of the ball. Because the ball bears the load of the working medium and is transmitted to the outlet sealing ring, this floating ball structure is widely used in medium and low pressure ball valves. In addition, the design shall also consider the large torque required for the operation of large-diameter ball valve.
Fixed ball valve
The ball of the fixed ball valve is fixed and will not move after being pressed. Therefore, in the design, the two sealing rings should have sufficient preload to ensure the sealing, which is a double-sided forced sealing. Thrust or sliding bearings are usually installed on the upper and lower valve stems connected with the ball.
