Iyi nhevedzano yeFan-yakavezwa isina bofu ndiro bhurukwa zvakare inonzi Goggle Valve, Flap Valve, uye chishandiso chinogona kubviswa seti yeGix Iyo inoshandiswa mune gasi yepombi pombi yemapipi emisangano yemukodhi uye miganho yemugodhi, kudzivirirwa kwemamiriro ekunze uye mamwe maindasitiri, kunyanya akakodzera kuti agurwe kubva kune ane chepfu uye inokuvadza magasi. Izvo zvakare zvakakodzera kushandiswa sedombo risingaone pamugumo wePombi kupfupisa nguva yekugadzirisa kana kubatanidza iyo nyowani pombi. Kuenzaniswa nedzimwe midziyo yeValve inocheka mhedziso-pombi-yakaumbwa yefirere yemapofu ine humbowo hwechiratidzo, size size, kukurumidza kushanda, uye yakavimbika yakagadzirirwa gasi-yekubvisa gasi kuita kwegasi.