According to the connection type of flange connection, it can be divided into three parts?
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Plate type flat welding flange, neck type flat welding flange, neck type flat welding flange, socket welding flange, threaded flange plate type flat welding flange, neck type flat welding flange, neck type flat welding flange, socket welding flange, threaded flange plate type flat welding flange, neck type flat welding flange, neck type flat welding flange, socket welding flange, threaded flange plate type flat welding flange, neck type flat welding flange, socket welding flange Welding flange, threaded flange