I-valve yokuhlehlisa i-hydraulic yezitshalo zokuxuba i-asphalt ngokuvamile ayithambekele ekuhlulekeni, kodwa ngezinye izikhathi kungase kube noshintsho lwesigaba esingakafiki isikhathi, ukuvuza kwegesi, i-electromagnetic induction pilot valve, njll., kanye nezimbangela zephutha ezihambisanayo nezindlela zokwelashwa zihlukile ngokwemvelo.

Uma i-valve yokuhlehla ye-hydraulic ingaguquki isigaba ngesikhathi, ibangelwa kakhulu ukungaqedi kahle, ukubhajwa kwentwasahlobo noma ukonakala, amabala kawoyela noma izinsalela ezibhajwe engxenyeni yokudonsa, njll. Kuyadingeka ukuhlola isimo se-pneumatic triplex kanye i-viscosity yamafutha. Uma kunesidingo, amafutha noma ezinye izingxenye zingashintshwa.
Ngesikhathi sokusetshenziswa isikhathi eside, i-hydraulic reversing valve yesitshalo sokuxuba i-asphalt ijwayele ukulimaza indandatho yokuvala i-valve core, isihlalo se-valve kanye ne-valve yesango yokucindezela okuphezulu, okubangela ukuvuza kwegesi ku-valve. Ngalesi sikhathi, indandatho yokuvala, isihlalo se-valve kanye ne-valve yesango enomfutho ophezulu kufanele kushintshwe, noma i-hydraulic reversing valve kufanele ishintshwe ngesikhathi.
Ngakho-ke, ukuze unciphise ngempumelelo izinga lokuhluleka kwemishini yesitshalo sokuxuba i-asphalt, kuyadingeka futhi ukunaka ukugcinwa kwemishini nezingxenye.