There are two ways to determine the stiffness parameters of pneumatic ball valve: theoretical analysis and experimental measurement.
For the pneumatic ball valve with simple shape, the theoretical analysis can use analytical method or graphical method to calculate the approximate solution, but for the pneumatic ball valve with complex shape, it is difficult to calculate its stiffness. Moreover, the analytical solution obtained from the theoretical analysis does not consider the influence of the pneumatic ball valve capsule wall material on the stiffness. Although the actual stiffness can be obtained from the experimental measurement, the test process requires samples, and it is difficult to adjust the parameters in the test process,
This has brought great difficulties to the design of pneumatic ball valves. It not only extends the design cycle, but also increases the research and development costs. Fortunately, with the rapid development and application of computer aided engineering, the use of simulation analysis for the design and optimization of pneumatic ball valves has gradually become an indispensable and effective means. The finite element method is used to analyze the stiffness of pneumatic ball valves, Not only the influence of the capsule wall material on the stiffness is considered, but also the stiffness of the pneumatic ball valve with complex shape can be well calculated. Since the 1990s, the simulation research of pneumatic ball valve system has become a hot spot. Many foreign scholars have carried out a series of simulation research on pneumatic ball valve using finite element method and obtained many important conclusions.
The research of domestic pneumatic ball valve began in 1957, when it was only limited to the pneumatic ball valve for vehicles. A preliminary study on the theory of pneumatic ball valve was conducted, and some experience was accumulated in theory and test