Valavu ya solenoid ndi gawo lowongolera lomwe, likakhala ndi mphamvu yamagetsi kapena de {{{}} Mukakhala ndi mphamvu, kayendedwe ka maginito kumapangitsa kuti musinthe kasupe. Pamene de {{3}, wophatikizika kapena gaivotive amaperekedwa kumalo ake oyambirirawo ndi kasupe. Wogwira ntchito amatenga mawonekedwe a electromacagnetnet.
