Kwishishini langoku lolawulo lokuhamba, iivalvu zokujonga i-wafer zithandwa ngakumbi ngenxa yoyilo lwazo oludityanisiweyo, lula ukufakela kunye neendleko eziphantsi zokuqala kunye nokugcina xa kuthelekiswa neetshekhi ze-flanged zakwantu.I-BVMC ibonelela ngepleyiti enye kunye neevalvu zokujonga ipleyiti ephindwe kabini ngezinto ezahlukeneyo.