To judge the sealing of a pneumatic flange ball valve, we must first know the source of its sealing performance, it can be said that any valve's sealing performance source is nothing more than three points, material, process and connection.
判断一个气动法兰球阀的密封如何，首先要知道其密封性能的来源，可以说，任何的阀门其密封性能来源都不外乎三点，材料、工艺和连接。
Among them, the material determines the initial sealing performance and the sealing performance of the later use process, the process determines the sealing effect brought by the structure, and the connection is the relative sealing effect between the pipe.
其中材料决定了其初始的密封性能和后期使用过程的密封性能，工艺决定了其结构带来的密封效果，连接则是和管道之间的相对密封效果。
Without experience, users often cannot directly see the process of pneumatic flange ball valves from the appearance.
若没有经验，用户往往无法从外观上直接看出气动法兰球阀的工艺。
Of course, this can be tested on a trial basis.
当然，这是可以以试用的方式来进行验证的。
The connection and material are often unable to change, each connection method and each material has a use, and it is impossible to obtain more accurate results in terms of sealing alone.
而连接和材料往往是无法改变的，每种连接方式和每种材料都有着用处，单以密封而论是无法得到较为准确的结果的。
