Tshuaj cog valve hom thiab daim ntawv thov qhov chaw (nrog hom kev ua tau zoo)
Chemical plant valve hom thiab daim ntawv thov qhov chaw (nrog rau hom kev ua tau zoo) Tom qab tsim lub tshuab nqus tsev vacuum, nyob rau hauv nees nkaum los yog peb caug xyoo dhau los, vim yog qhov tsim nyog ntawm cov roj crude, tshuaj nroj tsuag, fais fab nroj tsuag, metallurgical kev lag luam, ships, nuclear zog ge. ..
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