Bawul ɗin shine sashin sarrafawa a cikin tsarin isar da ruwa, tare da ayyukan yankewa, ƙa'ida, jujjuyawar, hana juzu'i, daidaitawar matsa lamba, jujjuyawa ko jujjuyawar matsin lamba.
Valvalve da aka yi amfani da shi a cikin tsarin sarrafa ruwa, daga mafi sauƙaƙan bawul ɗin tsayawa zuwa tsarin sarrafawa ta atomatik sosai, nau'ikan sa da ƙayyadaddun bayanai sun bambanta.Ana iya amfani da bawuloli don sarrafa magudanar ruwa iri-iri kamar iska, ruwa, tururi, watsa labarai masu lalata iri-iri, laka, mai, ƙarfe na ruwa da kafofin watsa labarai na rediyoaktif.Dangane da kayan, ana kuma raba bawul ɗin zuwa bawul ɗin ƙarfe na simintin ƙarfe, bawul ɗin ƙarfe na ƙarfe, bawul ɗin bakin ƙarfe (201,304,316, da sauransu), chromium molybdenum ƙarfe bawuloli, chromium molybdenum vanadium karfe bawuloli, bawul-lokaci karfe bawuloli, filastik bawuloli, bawuloli. -daidaitattun bawuloli, da dai sauransu.