Ama-valve ebhola asetshenziswa kabanzi ezinhlotsheni ezahlukahlukene kufaka phakathi amapayipi, uwoyela kanye negesi, ukwelashwa kwamanzi kanye nokwenziwa kwamanzi ngenxa yokuqina kwawo, ukuthembeka kanye nekhono lokuhlinzeka ngokuvalwa okuqinile.