I-throttle iyi-valve elawulwayo elawula ukugeleza komoya ungene enjini. Lapho igesi ingena ngepayipi lokudla, lizohlanganiswa nophethiloli futhi libe yingxube ehlanganayo, elizoshisa futhi lisebenze. Ixhumeke kwisihlungi somoya, i-Injini Block, eyaziwa ngokuthi umphimbo wenjini yemoto.
Izinjini ezine zokuhlanza uStroke kaphethiloli ngokuvamile zibukeka kanjena. I-Throttle ingenye yezingxenye ezibaluleke kakhulu zohlelo lwanamuhla lokujova kwezimoto ezigesi. Ingxenye engenhla yayo isihlungi somoya, ingxenye engezansi iyisilinda se-cylinder yenjini, futhi ngumphimbo wenjini yemoto. Ukusheshisa kwezimoto kuvumelana nezimo, futhi i-throttle engcolile inobuhlobo obuhle, ukuhlanza okuthe xaxa kunganciphisa ukusetshenziswa kwamafutha kungenza injini iguqulwe futhi iqine. I-throttle akufanele isuswe ukuze ihlanzeke, kodwa futhi nokugxila kwabanikazi ukuxoxa ngaphezulu
