Mavavu agulugufe ndi zigawo zapadera za chitoliro zomwe zimayendetsa kayendedwe ka madzi a zinthu, kaya ndi zamadzimadzi kapena mpweya. Amakhala ndi diski yozungulira yomwe imagwira ntchito mofanana ndi mapiko agulugufe. Diski imatha kuzunguliridwa kuti itsegule kapena kutseka valavu. Ma valve a butterfly amapezeka kawirikawiri m'mafakitale, mapaipi amadzimadzi ndi kutentha ndi kuzizira kuti azitha kuyendetsa madzi, mpweya kapena china chilichonse.
Ma valve a butterfly ndi ofunikanso paipi, chifukwa amathandiza kudziwa momwe madzi aziyendera. Ndizosavuta kugwiritsa ntchito komanso zofala m'mafakitale. Ma valve a butterfly amagwiritsidwa ntchito m'mafakitale monga mafuta ndi gasi, kuyeretsa madzi, kukonza zakudya ndi zakumwa. Ma valve awa ndi akulu ndipo amapangidwira ntchito zosiyanasiyana.