Ivalvu yokukhishwa komoya eyinhlanganisela yesivinini esiphezulu yakhiwe izingxenye ezimbili: Ivalvu yokukhishwa komoya enengcindezi ephezulu ye-diaphragm kanye nevalvu ekhipha umoya ophansi. I-valve yomoya womfutho ophezulu ikhipha ngokuzenzakalelayo inani elincane lomoya eliqoqwe ngaphakathi kwepayipi ngaphansi kwengcindezi. I-valve yomoya enengcindezi ephansi ingakhipha umoya epayipini lapho ipayipi elingenalutho lilethwa ngamanzi, futhi livuleke ngokuzenzakalelayo futhi lingene umoya epayipini ukuze kukhishwe i-vacuum lapho ipayipi likhishwa noma livacue noma ngaphansi kwesimo sokuhlukaniswa kwekholomu yamanzi.