Ivalve yokulawula umphunga licandelo elincinane kodwa yinxalenye ebalulekileyo koomatshini apho umphunga usetyenziswa khona. Ilawula ukuhamba komphunga ukuqinisekisa ukuba oomatshini basebenza kakuhle. Kweli nqaku siza kufumanisa ukuba kutheni uza kufuna ivalve yokulawula umphunga kwaye kutheni ivalve isetyenziswa kwiifektri.
Ivalve yerhuluneli yomphunga Yiba nomfanekiso wetrafikhi-isibane somphunga. Ilawula ukuba ungakanani umphunga ohamba ukusuka kwibhoyili ukuya kumatshini (ukuqinisekisa ukuba umthamo ofanelekileyo uthunyelwa ngexesha elifanelekileyo). Olu lawulo lubalulekile kuba ukugqithiswa komphunga kunokonakalisa isixhobo, kwaye kuncinci kakhulu kunokubangela ukuba sisebenze kakubi.