Valavu ya solenoid ya chokwera ndi zida zamagetsi zoyendetsedwa ndi ma electromagnetic, zomwe zimagwiritsidwa ntchito posintha momwe amayendera, kuyenda, kuthamanga ndi magawo ena apakati pamayendedwe owongolera mafakitale. Valavu ya solenoid ya chokwera imatha kugwirizana ndi mabwalo osiyanasiyana kuti akwaniritse kuwongolera koyembekezeka, ndipo kulondola ndi kusinthasintha kwa kuwongolera kumatha kutsimikizika. Valavu yamagetsi ya chokwera imamalizidwa pogwiritsa ntchito mphamvu yamagetsi pachitsulo chachitsulo chosindikizidwa mu manja odzipatula a maginito a valve yowongolera magetsi. Palibe chisindikizo champhamvu, kotero kutuluka kwakunja ndikosavuta kutsekedwa.