The Difference Between 3pc Flanged Ball Valve

3PC Flanged Ball Valve As the pressurized medium floats, the ball can move slightly and press against the outlet sealing surface, ensuring a tight seal. While pneumatic floating ball valves offer a simple structure and excellent sealing, the ball bears the load of the working medium, transferring it to the outlet sealing ring. Therefore, the ability of the sealing ring material to withstand the workload must be considered. This structure is widely used in low-pressure valves.

2. Fixed Ball Valve

Pneumatic ball valves are fixed and do not move under pressure.

Fixed ball valves feature a floating seat that is displaced by the pressure of the medium, forcing the seal against the ball to ensure a tight seal. Typically, the ball is mounted on a bearing on the lower shaft, resulting in low operating torque and suitable for high-pressure and large-diameter valves. To reduce operating torque and increase sealing reliability, valve seals have recently been introduced. A special lubricant is sprayed across the sealing surfaces to form a thin film, enhancing sealing while also reducing operating torque. These seals are particularly suitable for large-diameter, high-pressure ball valves.

3. Elastic Pneumatic Ball Valve: Pneumatic flanged ball valves are elastic. Both the ball and seat ring are made of metal, resulting in a high sealing pressure ratio. By itself, the seal reaches a pressure lower than the pressurized seal requirement, requiring external force to be applied to the media. This valve is suitable for high-temperature and high-pressure media. The elastic ball opens a flexible channel in the sphere and accesses the lower end of the flexible inner wall. When the channel is closed, the ball opens up the wedge-shaped stem of the valve seat seal. Before the ball is rotated to release the wedge, it returns to its original shape, creating a small gap between the sealing surfaces of the ball and the valve seat, reducing friction and operating torque. Pneumatic valves can be categorized by their position as straight-through, three-way, or right-angle types. The latter two types of ball valves are used to distribute media and change the flow direction of the media.