2. Its structure is not complicated and its work is not very heavy, because its valve pneumatic ball valve and plug ball valve belong to one type. It surrounds and rotates the line segment in the center of the valve body through the ball of the closing piece, which enables it to achieve the function of turning on and off street lights, which strengthens its sense of lightness; 　　

As the electric butterfly valve has been used in the market for many years, the packing is mainly asbestos packing or graphite packing or PTFE V-type packing. These packing will be limited by the valve and subject to a factor. In the process of using the electric butterfly valve, the packing will be worn and the gap will increase with the increase of use times, and the increase of control times will lead to the wear of the packing in the valve, As a result of leakage and other problems, we need to replace the packing or reduce the wear caused by the opening and closing quantity. When selecting the packing, we need to pay attention to the advantages of each packing and choose the appropriate one. Ensure that the packing is compacted to achieve a hard and dense effect without being affected when the packing is worn and consumed. Using this method requires irregular inspection and maintenance of fillers, construction wear, etc.