Bawul wani sashi ne mai sarrafawa a cikin tsarin isar da ruwa, wanda ke da ayyuka kamar yanke-kashe, daidaitawa, jujjuyawar ruwa, rigakafin juzu'i, daidaitawar matsa lamba, jujjuyawar kwarara ko jujjuyawar matsin lamba.Valves da aka yi amfani da su a cikin tsarin sarrafa ruwa sun fito ne daga mafi sauƙin yanke v..
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