By means of theoretical analysis and finite element calculation the contact pressure of sealing surface was simulated and the contact pressure distribution of sealing torus was described by polynomial

Additionally, the effect of different parameters, such as torque, sealing ring material and geometry, on the sealing performance of the valve was analyzed. The results showed that increasing torque can improve the sealing performance, while the material and geometry of the sealing ring have a significant impact on the sealing performance.

Furthermore, the flow characteristics of the double eccentric butterfly valve were analyzed using computational fluid dynamics (CFD) simulations. The results showed that the valve had a good flow characteristic with low pressure loss and uniform flow distribution. The flow coefficient and flow resistance coefficient were also calculated to evaluate the flow performance of the valve.

Overall, the theoretical analysis, finite element calculation, and CFD simulations provided a comprehensive understanding of the sealing and flow performance of the double eccentric butterfly valve, which can guide the design and optimization of the valve for better performance and reliability.