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.