Fixed ball valve is a new generation of high-performance ball valve. It is suitable for long-distance pipelines and general industrial pipelines. Its strength, safety and resistance to harsh environment are considered in design. It is suitable for all kinds of corrosive and non-corrosive media. Compared with floating ball valve, when it works, the force produced by the fluid pressure in front of the valve on the ball is all transferred to the bearing, and the ball will not move to the valve seat, so the valve seat will not bear excessive pressure. Therefore, the fixed ball valve has small torque, small seat deformation, stable sealing performance and long service life, which is suitable for high pressure and large caliber occasions. Advanced spring pre-seat assembly, with self-tightening characteristics, to achieve upstream sealing. Each valve has two seats, each direction can be sealed, so the installation is bidirectional without flow restriction. This valve is generally installed horizontally.