4, ivalve yeglowubhu: ibhekisa kwiindawo zokuvala (idiski) ecaleni komgca osembindini wentshukumo yesitulo sevalve.Ngokutsho kwefom ehambayo ye-disc, utshintsho lokuvula isihlalo se-valve luhambelana ngokuthe ngqo kwi-disc stroke.Ngenxa yolu hlobo lwe-valve isiqu esivulekileyo okanye esivaliweyo sifutshane, kwaye sinomsebenzi othembekileyo osikiweyo, kwaye ngenxa yokutshintshwa kwe-valve yokuvula isihlalo kunye nokubetha i-disc ihambelana ngokuthe ngqo, ifanelekile kakhulu kulawulo lokuhamba.Ngoko ke, olu hlobo lwevalve luvakalelwa kakhulu ekusikeni okanye ekulawuleni nasekubetheni.
Izinto eziluncedo:
(1) Kwinkqubo yokuvula kunye nokuvala, ngenxa yengxabano phakathi kwe-disc kunye ne-valve yomzimba wokutywina indawo yokutywina incinci kune-valve yesango, ngoko ke ukuxhathisa ukunxiba.
② Umphakamo wokuvula ngokuqhelekileyo yi-1/4 kuphela yetshaneli yesitulo sevalve, incinci kakhulu kunevalve yesango;
(3) ngokuqhelekileyo kukho indawo enye yokutywina kumzimba wevalve kunye nediski, ngoko ke inkqubo yokuvelisa ingcono, kulula ukuyigcina;
④ Njengoko isigcwalisi singumxube weasbestos kunye negraphite, sinenqanaba lokumelana nobushushu obuphezulu.Iivalvu zomphunga jikelele zisetyenziswa yivalve yeglowubhu.
Izinto ezingeloncedo:
(1) Ngenxa yokuba umkhombandlela wokuqukuqela ophakathi kwivalvu utshintshile, ngoko ke ukuchasana kokuhamba okuncinci kwevalve yeglowubhu kuphezulu kunezinye iintlobo ezininzi zeevalvu;
② Ngenxa yokubetha ixesha elide, isantya sokuvula sihamba kancinci kunevalve yebhola.

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