Tshauv paug valve yog cov cuab yeej tseem ceeb rau cov khoom siv tshem tawm plua plav, huab cua thiab lwm yam khoom noj, haum rau cov khoom siv hmoov thiab cov khoom siv granular.Rau kev tiv thaiv ib puag ncig, metallurgy, tshuaj lom neeg, khoom noj khoom haus, khoom noj khoom haus, lub zog thiab lwm yam kev lag luam siv dav siv.Tshauv valve...
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