Nthawi zambiri amatsegula ma valves ndi valavu imakhala yotseguka pokhapokha mutalimbikitsidwa. Mphamvu ikagwiritsidwa ntchito, imayandikira nthawi yomweyo, ndikukhalabe pomwepo bola. Chifukwa cha momwe amatseka, izi sizikupangidwa kuti zizigwiritsa ntchito maola ambiri. Ndizosafunikira kwambiri pazinthu zomwe valavu imayenera kungotseka ma splurts achifupi, ndipo ayenera kukhalabe otseguka nthawi zambiri.
Ntchito yotseguka nthawi zonse imakhala yothandiza pamavuto komwe kuli kofunikira kuti madziwo akuyenda nthawi zonse. Chitsanzo chabwino ndi nsanja yozizira ya mafakitale omwe amayenera kukhala kuti asatenthe kwambiri. Zikatero, solenoid imangokhala ndi mphamvu (kuti itseke valavu) pakakhala kufunika kwenikweni kutseka, mwachitsanzo, nthawi yokonza kapena kukonza.
