Stainless Steel Ball Valve 3

Ball valves can be divided according to their structural form:

Floating ball valve: The ball of the ball valve is floating. Under the action of medium pressure, the ball can produce certain displacement and press tightly on the sealing surface of the outlet to ensure the sealing of the outlet. Floating ball valve has simple structure and good sealing performance, but the load of working medium on the ball is all passed to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in low and medium pressure ball valves.

Fixed ball valve: The ball body of the ball valve is fixed and does not move after being pressed. Fixed ball valves are equipped with floating seats. After medium pressure, the seats move, so that the sealing ring is pressed on the ball to ensure sealing. Usually, bearings are installed on the upper and lower axles of the sphere, and the operation torque is small. It is suitable for high pressure and large caliber valves. In order to reduce the operating torque of the ball valve and increase the reliability of the enclosed seal, oil-sealed ball valves have appeared, which not only inject special lubricating oil between the sealing surfaces to form a layer of oil film, which enhances the sealing performance, but also reduces the operating torque, and is more suitable for high-pressure and large-caliber ball valves.