I-valve yendlela ezintathu sisixhobo esisetyenziswa ngokubanzi kwinkqubo yokutshiza. Umsebenzi wawo kukutshintsha ukuhamba kombhobho ngokuthanda. Ivalve ingadityaniswa kwimibhobho emithathu, enye yazo ngumbhobho wokungena kwamanzi kwaye ezinye ezimbini yimibhobho yokuphuma kwamanzi. Ubume bezibambo ezijikelezayo ziqhuba I commutator engqukuva kwivalve iyajikeleza, ukuze kufezekiswe naluphi na unxibelelwano okanye ukuvalwa phakathi kwemibhobho eyahlukeneyo.

Ezinye iinkqubo zokutshiza zinemibhobho entsonkothileyo. Umzekelo, umlomo kufuneka ufefe ulwelo oluphakathi. Indlela yesiko kukuba kufuneka ufakele imilomo emibini kwaye ulungiselele imibhobho emibini eyahlukileyo ngokupheleleyo kule mibhobho mibini. Le yinkunkuma yeendleko kwaye indawo ayimoshwa. Ukuba ivelufa ngendlela ezintathu-ifakiwe nemiboko emibini ugwebu, nogwali lokuphuma enye kuphela edityaniswe kwi umlomo mnye, ngoko yi kokutshintsha engile ka vana, amajelo ezahlukeneyo ungalawuleka ukuba betekisi ukusuka kumbhobho enye umlomo.