Lub valve yog cov cuab yeej lossis cov khoom siv ntuj tsim los tswj, tswj lossis tswj cov dej ntws (gases, kua, kua dej, lossis slurries) los ntawm kev qhib, kaw, lossis ib feem cuam tshuam ntau txoj kev nkag. Valves yog technically fittings, tab sis feem ntau yog tham raws li ib tug cais pawg. Hauv ib ...
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