Chigwa cha solenoid chikupereka mpweya kwa wochita izi ayenera kukhala ndi madoko anayi: imodzi yotulutsa mpweya (p) Mauvuwa amafunika kuti azichita makanema owonjezera pawiri} chifukwa amasintha njira yopita pansi pa ma cylinder kulowera pamwamba pa doko lina la cylinder. Izi zimathandiza silinda kuti mutsegule mwachangu kwambiri. Valavu yamtunduwu ndi yothandiza kwambiri ngati mitundu yosiyanasiyana yamadzi imasakanikirana wina ndi mnzake mu gawo lina lokhazikika.
