The structure is analyzed by finite element technology. As shown in Figure 3, the analysis results are obtained when 0.4 mpa pressure is applied to the traditional structure valve plate of dn1700 connecting rod butterfly valve. It can be seen that the maximum deformation of the whole valve plate is on two vertical plates. At this time, the maximum deformation is 1.69 mm, which will cause great damage to the pin shaft and shaft sleeve connected to the valve plate. As shown in Figure 4, the dn1700 cold air valve of the cold air pipe of the hot air furnace is damaged (the pressure of the cold air pipe is 0.47mpa and the temperature is 350 ℃). The reason for the damage of the valve is that the pin shaft connected to the valve plate is bent, and the self-lubricating bearing at the pin shaft is completely crushed.

1、 Introduction to pneumatic switch ball valve In fact, there is no big difference between pneumatic ball valve and electric ball valve, mainly a slight difference in working principle. Another is that the execution speed is relatively fast if it is pneumatic, so someone has another name for pneumatic ball valve, pneumatic quick cut-off ball valve, The selection of two types of valves is generally based on the required cutting speed, and the pneumatic ball valve has many other accessories, so it also has many functions. The representative is its remote control system. If the working environment is dangerous, the pneumatic ball valve used only needs to be controlled in the control room, It not only saves human resources but also greatly enhances security.