In a word, no matter what type of valve is used in any official way, it should be viewed correctly in advance, and the selection work should be done well, so that it can be put on the position where it can give full play to its value, so that the equipment can truly achieve full automation.

◆ Shell structure: The valve body of the fixed ball valve can be planned into three modes: casting structure, casting structure and all welded structure according to the user's needs and actual working conditions. Among them, the ball valve with all welded structure is mainly suitable for underground use.