(3) The straight through double seat valve is shown in Figure 4. The straight through double seat control valve has two valve cores and two valve seats. The fluid flows from the left side as shown in the figure, passes through two valve cores and valve seats, and then converges to the right side and flows out. Since the upward thrust on the upper valve core and the downward thrust on the lower valve core are basically balanced, the unbalanced force on the whole valve core is small. The features of straight through double seat valve are as follows.

When using the pneumatic butterfly valve, if the operator finds material leakage at the valve packing part, he can use tools to slightly tighten and strengthen the valve stem and nuts. Some of them can not continue to use tools to tighten the valve stem and nuts until the leakage material no longer appears. If too much is screwed, the valve may be seriously damaged, which is very uneconomical. It is better not to store the valve in the open air for a long time, which may lead to a large number of rust spots on the valve body and valve components, and eventually the valve cannot be used normally. When the valve is stored, it needs to be well protected against rain and moisture in advance. When relevant pneumatic control valves are installed and put into operation, what should be noticed is the market scope of electric switch butterfly valves. Introduction to the installation and use of pneumatic switch ball valves. How promising is the development prospect of pneumatic ball valves? How is the sealing structure of electric ball valves so good