With the continuous promotion of automation and its application in more and more fields, fluid transportation is one of them. Although China's economy has taken off since the reform and opening up, there are still many problems. Therefore, many national projects have been developed, such as the West to East Gas Transmission Project and the South to North Water Transfer Project. All these need to be applied to valve technology, Pneumatic high-pressure valve is also the most important part. 　　

The typical failure of electric ball valve is also common. The safety valve, the spring object in the middle of the valve stem and the action of an actuator, when its valve repeatedly urges the side of the gate, it may be a closed body that controls the fluid to act on the piston in the actuating structure to overcome the spring force, so as to keep it open at other parts, Therefore, it will continue under control for a long time. When this structural valve is abandoned at a large depth, and its own pressure is largely lower than the surrounding sea pressure, the spring of the electric ball valve must be large enough, and the force to close the valve cannot move the valve to the failed position because of its own pressure. It really happens under extreme circumstances. Therefore, reducing the size of the actuator increases the in-depth rating of the valve.