Flo loos na throttling lus bilong en em i ol bikpela samting bilong presa lus bilong solenoid valv taim wara i ron i go insait long valv. lik bilong solenoid daireksenel valv i makim lik i kam long hai presa rum i go long liklik presa bikos long ol wok kondisen na tu ol wok posisen bilong en.
