At present, some electric equipment of reversing valves have mechanical limits to avoid the inability to judge the orientation of the valve disc. The corresponding connection between the connecting screw hole and the keyway orientation between such valves and electric equipment is strict.

In addition to the large use span in this aspect, we will also find that we can use the pressure from high vacuum to high pressure almost anywhere. The use of this aspect can better promote our overall use effect in the future. If we carefully review this, we can make better choices in the future.