Popeza sindinasamalirepo kwambiri valavu yobwezeretsa muzitsulo zosakaniza za asphalt kale, ndilibe thandizo chifukwa cha kulephera kwa chipangizochi. Ndipotu, kulephera kwa valve yobwerera sikovuta kwambiri. Malingana ngati mukudziwa pang'ono za izo, mudzadziwa momwe mungathanirane nazo?
Palinso ma valve obwerera m'mafakitale osakaniza phula, ndipo kulephera kwake sikungowonjezera mavuto omwe amapezeka nthawi zonse, kutayika kwa gasi, ndi ma valve oyendetsa magetsi. Zachidziwikire, zomwe zimayambitsa ndi zothetsera zomwe zimagwirizana ndi mawonetseredwe amavuto osiyanasiyana ndizosiyana. Chifukwa chodabwitsa cha kusinthika kwanthawi yake kwa valavu yobwerera, ambiri aiwo amayamba chifukwa chamafuta osavuta a valavu, akasupe omata kapena owonongeka, mafuta kapena zonyansa zomwe zimakhazikika m'malo otsetsereka, etc. Chifukwa cha izi, ndikofunikira kuyang'ana mkhalidwe wa kachipangizo kakang'ono ka mafuta ndi kukhuthala kwa mafuta opaka mafuta. Ngati pali vuto, mafuta opaka mafuta kapena magawo ena akhoza kusinthidwa. Chomera chophatikizira phula chakhala chikuyenda kwa nthawi yayitali, valavu yake yobwerera imakonda kuvala mphete yachisindikizo cha valve, kuwonongeka kwa tsinde la valve ndi mpando wa valve, zomwe zimapangitsa kuti mpweya utuluke mu valve. Panthawiyi, njira yolondola komanso yothandiza yothetsera vutoli ndikusintha mphete yosindikizira, tsinde la valve ndi mpando wa valve, kapena kusintha mwachindunji valavu yobwerera kuti mugonjetse vutoli.