Vavu ya butterfly yomwe imadziwikanso kuti flap valve, ndi njira yosavuta yowongolera, komanso imatha kugwiritsidwa ntchito powongolera mapaipi apakati. Vavu ya butterfly imatanthawuza mtundu wa valavu yomwe gawo lake lotsekera (disiki kapena diski) ndi diski, yomwe imazungulira kuzungulira shaft ya valve kuti itsegule ndi kutseka. Imagwira makamaka ntchito yodula ndikugwedeza paipi. Kutsegula ndi kutseka kwa valve ya butterfly ndi mbale ya butterfly yofanana ndi disc, yomwe imazungulira kuzungulira kwake mu thupi la valve, kuti akwaniritse cholinga chotsegula ndi kutseka kapena kusintha. Vavu ya butterfly imagwira ntchito pamapaipi omwe amatumiza zinthu zosiyanasiyana zowononga komanso zosawononga zamadzimadzi mu jenereta, gasi, gasi lachilengedwe, gasi wamafuta amafuta, gasi wamzinda, mpweya wozizira komanso wotentha, kusungunula kwamankhwala ndi kupanga magetsi ndi makina oteteza zachilengedwe, omwe amagwiritsidwa ntchito wongolera ndi kudula mayendedwe a sing'anga.
