Therefore valve stopper is used in construction, and 0.
为此在施工中采用活瓣桩尖，并用0。
As you then pull the stopper back out, you will hear air entering through the other valve.
正如你，然后拉回到塞子，您会听到空气进入，通过其他阀。
The special hydraulic valve taking the place of the stopper for gas pipe has improved the efficiency, decreased the intensity and danger in the operation of gas.
在煤气管道上安装液压翻板阀，通过操作翻板代替人工抽堵盲板作业可以提高工作效率，降低劳动强度和作业危险性。
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