Zvikamu zvekuvhura nekuvhara zvevhavha yekumisa i-plug-shaped disc, nzvimbo yekuisa chisimbiso yakati sandara kana conical, uye dhisiki inofamba mumutsara wakatwasuka uchitevedza mutsara wepakati wemvura. Iyo yekufambisa fomu yetsvimbo yevharuvhu inosanganisira iyo yekusimudza tsvimbo yemhando (yevhavha tsvimbo inosimudzwa uye handwheel haina kusimudzwa) uye inosimudza inotenderera tsvimbo yemhando (handwheel inotenderedzwa uye inosimudzwa pamwe chete nevhavha tsvimbo, uye nati inogadzika pa. muviri wevharuvhu). Basa revhavha yekumisa rinongoshanda kune yakazara yakazaruka uye yakazara kuvhara, uye haibvumidzwe kutonga uye throttle. Izvi zvinonyanya kutariswa nehunhu hwevhavha yekumira, sezvinotevera:
