Valve
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Bakin ƙarfe bakin ƙarfe bawul
Bawul ɗin shine sashin sarrafawa a cikin tsarin isar da ruwan bututun.Ana amfani dashi don canza sashin tashar da kuma jagorancin matsakaicin matsakaici.Yana da ayyuka na karkatarwa, yankewa, matsewa, dubawa, shunt ko matsi mai ambaliya.