I-throttle yivalvu elawulwayo elawula ukuhamba komoya ungene enjinini. Xa igesi ingena kumbhobho wokungenisa, iya kuxutywa nepetroli kwaye ibe ngumxube ovuthayo, oya kutsha kwaye usebenze. Iqhagamshelwe kwisihluzi somoya, ibhloko yenjini, eyaziwa ngokuba yi-throttle yenjini yemoto.
Iinjini zepetroli ezine-throttle ezine-stroke zihlala zijongeka ngolu hlobo. I-throttle yenye yezona ndawo zibalulekileyo kwinkqubo yenjini yemoto yanamhlanje ye-electric injection. Inxalenye ephezulu yayo sisihluzo somoya, inxalenye esezantsi yi-injini ye-cylinder block, kwaye ngumphimbo wenjini yemoto. Ukukhawuleziswa kwemoto kuyaguquguquka, kwaye i-throttle engcolileyo inobudlelwane obuhle, ukucoca i-throttle kunokunciphisa ukusetyenziswa kwepetroli kunokwenza injini iguquguquke kwaye yomelele. I-throttle akufuneki isuswe ukuze icoceke, kodwa kunye nokugxila kwabanini ukuze baxoxe ngakumbi.
