Ziziphi izizathu zokulimala kwendawo yokutywina ivalve
Iperi yevalve yokutywina ikwimeko engatshintshiyo ngaphandle kwentshukumo ehambelanayo, ebizwa ngokuba yi-static seal.Umphezulu wetywina ubizwa ngokuba ngumphezulu wokutywina omileyo.
Izizathu zokonakala kwendawo yokutywina emileyo zishwankathelwa ngolu hlobo lulandelayo:
① Uburhabaxa bomphezulu wokutywina omileyo buphezulu, obubangelwa ikakhulu lixesha elide lenkonzo, ukhukuliseko oluphakathi kunye nokugcinwa kakubi.

② Kukho i-indentation ecacileyo kwindawo yokutywina engatshintshiyo, ebangelwa ubukhulu becala ubunzima obuphezulu be-gasket ekhethiweyo okanye ukuxuba isanti, i-weld beading, njl.

③ Kukho imikrwelo kunye nemikrwelo kwindawo yokutywinwa kwe-static, eyona nto ibangelwa ukuphulwa kweenkqubo zokusebenza kunye namandla angafanelekanga ngexesha lokuqhawula kunye nokucoca.
④ Umphezulu omileyo wokutywina unomhlwa kakhulu, obangelwa ikakhulu kukumhlwa okuphakathi kunye nokukhethwa kwevalve ngendlela engafanelekanga.
⑤ Kukho iigrooves ezicacileyo kumgangatho wokutywina omileyo, obangelwa ikakhulu kukungaphumeleli ukulungiswa kwangethuba emva kokuvuza kwendawo yokutywina emileyo kunye nokhukuliseko oluphakathi.
⑥ Ukuguqulwa kwendawo yokutywina okumileyo kubangelwa ubukhulu becala kukuqina okungonelanga, amandla okudibanisa ngokugqithiseleyo kunye nokunyuka kwe-thermal kwiqondo lokushisa eliphezulu.

⑦ Kukho imingxunya evuzayo kumphezulu wokutywina omileyo, obangelwa ikakhulu ziziphene ezinje ngokugotywa, imingxuma kunye namaqhuma abangelwa kukungaphucuki komgangatho wokwenziwa.
8 Iintanda kumphezulu wokutywina omileyo zibangelwa ikakhulu kuyilo olungekho ngqiqweni, umgangatho wokwenziwa ombi, ufakelo olungafanelekanga okanye ukusebenza, kunye nomthwalo otshintshanayo wexesha elide.
Umonakalo wokutywinwa kwendawo yokutywina yenye yezona zizathu eziphambili zokuvuza kwevalve, ekufuneka ihlawulwe ingqalelo.

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