Izitshixo zevalve yendalo yonke zinezinto ezininzi, zihexa, kulula ukuzisebenzisa kwaye zikhaphukhaphu ngobunzima - zilungele ukutshixa iivalvu ezisemgangathweni zazo zonke iindidi kusetyenziswa isixhobo esinye.Isixhobo sokutshixa ivalvu jikelele sinokulungisa zonke iintlobo zeevalvu kwindawo “evulekileyo” okanye “evaliweyo”.Ukutshixa kuvumela iivalve ezininzi okanye iilever ukuba zitshixelwe ngesixhobo esinye, kupheliswe imfuno yokutshixa okuninzi.Ukuvalwa kwevalvu yendalo yonke kufanelekile kwiivalvu zebhola, iivalvu zesango kunye neevalvu zebhabhathane, kulula ukuzisebenzisa.Ziyilelwe ukuphatha izothuso ezongezelelweyo kwaye zixhathise iikhemikhali, zizenza zilungele phantse nakuphi na okusingqongileyo.