Valavu ya diaphragm yopangidwa ndi chakudya imayendetsedwa patali ndi chipangizo choyendetsa kapena chogwiritsidwa ntchito pamanja.Chipangizo choyendetsa chili ndi miyezo itatu: mtundu wotsekedwa, mtundu wotseguka komanso mtundu wa gasi.Zili ndi ubwino wa dongosolo losavuta, maonekedwe okongola, kusokoneza mwamsanga ndi kusonkhana, kusinthasintha ntchito, kukana kwamadzimadzi ang'onoang'ono, kugwiritsidwa ntchito kotetezeka komanso kodalirika, etc. Ndikoyenera kuyang'anira madzi, gasi, mafuta ndi zowonongeka m'makampani opanga mankhwala, mafuta a petroleum. , zitsulo, kutentha madzi, chakudya, mankhwala ndi mafakitale ena.