Ma valve othamanga kwambiri omwe amapangidwa ndi YS amaphatikizapo mtundu wa Bosch ndi mtundu wa Denso. YS pressure limiting valve imayang'anira ndikuwongolera kuthamanga kwamafuta panjira yayikulu yamafuta. Pofuna kuonetsetsa kuti injini ikuyenda bwino, kuthamanga kwamafuta panjira yayikulu yamafuta kuyenera kukhala koyenera. Panthawiyi, valavu yochepetsera kuthamanga idzatsegulidwa, ndipo mafuta adzabwezeredwa kudzera pa pampu yamafuta, yomwe imatha kuwongolera Kuthamanga kwamafuta kwa gawo lalikulu lamafuta.