Ngokuthuthuka komphakathi, izwe libheke kakhulu ukwakhiwa kwezindaba zomasipala. Ngakho-ke, njengemishini ebalulekile ekuthuthukisweni nasekwakhiweni kwezindaba zikamasipala, izitshalo zokuxuba i-asphalt ziya ngokuya zithandwa futhi imvamisa yokusetshenziswa iyanda. Izitshalo zokuxuba i-asphalt zizohlangabezana namaphutha athile kakhulu noma ngaphansi ngesikhathi sokusetshenziswa. Lesi sihloko sethula kafushane indlela yokuxazulula iphutha le-valve ehlehlayo esitshalweni sokuxuba i-asphalt.

Uma kunenkinga nge-valve yokuguqula esitshalweni sokuxuba i-asphalt, ukubonakaliswa ngokuyinhloko ukuthi i-valve ayikwazi ukuguqulwa noma isenzo sokubuyisela sihamba kancane. Kungase futhi kube nokuvuza kwegesi, ukwehluleka kwe-valve yomshayeli we-electromagnetic, njll. Ngokuvamile, lapho uhlangabezana nenkinga enjalo, into yokuqala okufanele uyicabangele ukuthola umsuka wephutha, ukuze iphutha liqedwe ngokunembile nangempumelelo.
Uma i-valve ehlehlayo ingakwazi ukuhlehliswa noma isenzo sokuhlehla sihamba kancane, umsebenzisi angacabangela izizathu ezifana nokungagcobi kahle, ukugcwala kwentwasahlobo, noma ukungcola kukawoyela okuminyanisa izingxenye ezishelelayo. Ngalesi sikhathi, umsebenzisi angakwazi ukuhlola kuqala idivayisi yenkungu yamafutha ukuze ahlole isimo sokusebenza, bese eqinisekisa i-viscosity yamafutha okugcoba. Uma inkinga itholakala noma iyadingeka, amafutha okugcoba noma intwasahlobo ingashintshwa.
Ukuvuza kwegesi kuvame ukubangelwa i-valve ehlehlayo yesitshalo sokuxuba i-asphalt esebenza ngemvamisa ephezulu isikhathi eside, okubangela ukuguga kwendandatho ye-valve core seal nezinye izingxenye. Uma uphawu lungaqinile, ukuvuza kwegesi kuzokwenzeka ngokwemvelo. Ngalesi sikhathi, indandatho yophawu noma isiqu se-valve nezinye izingxenye kufanele kushintshwe.