Ubwa mbere, bikwiriye gukoreshwa: ubwoko bwose bwinguni muri 18-62mm ya valve irashobora gukoreshwa; Icyapa gihitamo icyuma cya kabiri, kubumba: isura ikora no hejuru no hepfo gutondeka gutunganya; Bitatu, nta gusya: impeta yintebe ya valve nyuma yo kuyitunganya muri rusange ntabwo ikenera gusya, irashobora gukoreshwa neza na valve nshya; Bane, imyanya nyayo: menyesha intebe ya valve ikora mumaso Inguni, umwanya wa chamfer yo hejuru na hepfo, ubugari hamwe na coaxiality hamwe nubuyobozi bwa valve; Gukoresha bitanu: icyuma cya reamer hamwe na blunt…
