Kutengera kuwunika kwazomwe zimayambitsa kuvala, gawo la "cylinder liner-piston ring" la injini yam'madzi limaphatikizapo mavalidwe anayi awa:

(1) Kutopa kumakhala kodabwitsa komwe kumapangitsa kukangana kwakukulu ndi kupsinjika komwe kumalumikizana ndikupanga ming'alu ndikuwonongeka. Kutopa kumayenderana ndi kuwonongeka kwamakina amtundu wanthawi zonse;

(2) Zovala za abrasive ndizodabwitsa kuti tinthu tating'onoting'ono tating'ono tating'ono tating'onoting'ono tating'onoting'ono timayambitsa ma abrasions ndi kukhetsedwa kwa zinthu zapamadzi pamwamba pa mikangano yoyenda. Kuvala kowononga kwambiri kumapukuta khoma la silinda ya injini, zomwe zimatsogolera kuzovuta kwa mafuta opaka pamwamba pa khoma la silinda. Filimu yamafuta imayambitsa kuwonongeka kwakukulu, ndipo aluminium ndi silicon mumafuta ndizomwe zimayambitsa kuvala kwa abrasive;

(3) Kumata ndi abrasion chifukwa cha kuwonjezereka kwa mphamvu yakunja kapena kulephera kwa sing'anga yopaka mafuta, "kumatira" kwapamwamba kwa okwatiranawo kumachitika. Adhesion ndi abrasion ndi mtundu wovuta kwambiri wa kuvala, zomwe zingayambitse kupukuta kwa zinthu zapadera zomwe zimapangidwira pamwamba pa silinda ya silinda , Kuwononga kwambiri ntchito ya injini;

(4) dzimbiri ndi kuvala ndi chodabwitsa cha imfa mankhwala kapena electrochemical zochita pakati pa zinthu pamwamba ndi sing'anga ozungulira pa kayendedwe wachibale pamwamba pa mikangano awiriwo, ndi kutaya zinthu chifukwa cha mawotchi kanthu. Pankhani ya dzimbiri ndi kuvala kwambiri, zinthu za pakhoma la silinda zimachotsedwa, ndipo ngakhale kusuntha kwapang'onopang'ono kwapang'onopang'ono kumachitika, zokutira zapamtunda zimataya zida zoyambirira ndikuwonongeka kwambiri.