Valve wani yanki ne na sarrafawa a cikin tsarin jigilar ruwa, wanda ke da ayyuka kamar su yanke, daidaitawa, karkatarwa, hana counter current, daidaita wutar lantarki, karkatarwa ko matsi mai ambaliya.Akwai nau'ikan bawuloli da yawa, kuma ana iya raba su zuwa: 1. Trippi...
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