其主要功能是切断或接通管道内的介质流通通道。
Its major function is the cut-off or puts through in pipeline's medium circulation channel.
在管道系统中起对介质的接通或截流，流通能力强，压损小，双向密封可达到零泄漏。
In the pipe system, the medium is connected or cut, the flow capacity is strong, the pressure loss is small, the two-way sealing can achieve zero leakage.
如今图书馆已经成为书籍、杂志等印刷出版物以及音像资料、胶片等图像介质，甚至电子出版物的多媒体存储、流通、展览、阅读的综合性空间。
Now, it has been a Mixed Use library which contains printed publication (books magazine), imagine medium (audio-video film) and E-journal for store circulate exhibit and read.
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