Indima yeRingi yoNcedo kwiSakhiwo sokutywina iValve kunye neendawo zokucubungula ingqwalasela
Indandatho yokuxhasa iindawo ezinjalo, kwisakhiwo sonke sesitywino seseendawo eziphambili 'ezifihliweyo'. Abasebenzisi abaninzi abayinaki kakhulu, kodwa eneneni, xa uyilo okanye ukucutshungulwa kungasekho, ukusasazwa kwamandla okucinezelwa kwesitywino sesihlalo sevalvu, iringi yePTFE kuya kuba nefuthe elikhulu, ingakumbi kuxinzelelo oluphezulu okanye ukuguquguquka kobushushu kwindawo engqongileyo okucacileyo ngakumbi.
Ngaphambili besijongene neprojekthi yomthengi waseMntla Afrika, isihlalo sevalvu sisebenzisa isakhiwo sentsimbi esijikelezayo + isakhiwo se-seal esiguquguqukayo, iringi ye-PTFE ekufakweni kokuqala ayiyongxaki, kodwa isebenza emva kweenyanga ezimbalwa emva kokufunyanwa kokonakala kokusebenza kokutywinwa, kwanokuguqulwa kwe-extrusion yesitywina. Emva kokubuyela kumzi-mveliso ukuze kuhlolwe isidumbu, kwafunyaniswa ukuba ingxaki yayikukuphambuka kobukhulu beringi yokuxhasa + i-chamfer yangaphakathi yayinzulu kakhulu, nto leyo ebangela amandla angalinganiyo.
Kule meko, sinika ezi ngcebiso zilandelayo: Okokuqala, ukucutshungulwa kweringi yokuxhasa akukwazi nje 'ngokwemizobo yesangqa', isitshixo sikwindlela yokulawula ukunyamezelana kunye necala lokuchamfering; Okwesibini, ngokwezinga lokucinezelwa kwezinto zokutywina ukushiya umda wokucinezelwa, ingakumbi kwiqokobhe lesinyithi lombhobho kunye nokwandiswa rhoqo kunye nokucutheka kweringi yokuxhasa xa umphezulu wokudibana ukhululekile, kulula ukujika ngokulula kwisitywina esithambileyo.
Kwinqanaba lokucubungula, iringi yokuxhasa iyacetyiswa ukuba ijikwe ngokurhabaxa ukusuka kwiibushings ezigqityiweyo okanye iiforgings eziqinileyo, kwaye isangqa sangaphandle, umngxuma wangaphakathi kunye nenyathelo kufuneka zigqitywe nge-clamping enye ukulawula ukuqengqeleka kunye nokuqina. Xa sijika olu hlobo lweendawo, ngokubanzi silawula uburhabaxa bomphezulu ngaphakathi kweRa 1.6, umphezulu obalulekileyo weRa 0.8, ulwalathiso oluchamfe ngokwesikhokelo sokuhlanganiswa ukuze kuthintelwe ukonakala komphetho weringi yotywino.
Nangona ixabiso leringi yenkxaso lingekho phezulu, kodwa linempembelelo enkulu ekuzinzeni kwetywina levalvu lonke. Kucetyiswa ukuba umthengi okwinqanaba lokuzoba acacise ulandelelwano lokuhlanganisa, istroke yokucinezelwa kunye nendawo yedatum, ukuba kuyimfuneko, anike isihlalo sevalvu okanye umzimba wevalvu isakhiwo somzobo, ukuze sidibanise uvavanyo lwesiphumo solwakhiwo ngokubanzi. Icala lethu linokunceda ekulinganiseni imeko yokulingana okushushu, kwangaphambili ukugweba umngcipheko wokushenxiswa kwetywina phantsi koxinzelelo oluphezulu okanye ubushushu obuphezulu.