3. When replacing the stuffing box, if you want to replace the electric three-way ball valve, you need to find one of the same type. During the replacement process, you should be more careful, that is, hook out the packing to prevent damage to the valve stem. When installing a new stuffing box, you should follow the relevant instructions. Do not misplace the stuffing box, which will scratch the threads of the valve stem. In addition, the packing should have a uniform and appropriate compression force to prevent increased friction. 　　　　

The two position five way solenoid valve is generally used together with the double effect pneumatic actuator. The two positions are controllable in two directions: on-off, five way is with five channels for ventilation, one of which is connected with the air source, two of which are connected with the inlet and outlet of the external air chamber of the double effect cylinder, and two of which are continuous with the inlet and outlet of the internal air chamber, The detailed operating principle can refer to the operating principle of double effect pneumatic actuator.