I-valve yeplastiki luhlobo olusetyenziswa ngokubanzi lwevalve, ineenzuzo zokuxhathisa i-corrosion, ubunzima bokukhanya, ukumelana nokugqoka, njl. Isetyenziswe ngokubanzi kwiikhemikhali, i-petrochemical, ukukhuselwa kwendalo kunye namanye amashishini.Oku kulandelayo yimbali yophuhliso lweevalvu zeplastiki.
Kwi-1950s, kunye nophuhliso olukhawulezayo lweshishini lemichiza, imfuno yeevalvu ngokuthe ngcembe yanda.Ngeli xesha, izinto zeplastiki zisetyenziswe ngokubanzi kwintsimi yoshishino, ngoko ke ezinye iinjineli zaqala ukufunda indlela yokusebenzisa izinto zeplastiki ekwenzeni iivalvu.Iivalvu zeplastiki zakwangoko zazenziwe ikakhulu kusetyenziswa i-polyvinyl chloride (PVC) imathiriyeli, enokumelana ne-corrosion, kodwa iipropathi zayo zoomatshini zihlwempuzekile kwaye zilungele kuphela uxinzelelo oluphantsi kunye nendawo yokusebenza yobushushu obuphantsi.
Kwiminyaka ye-1960, kunye nophuhliso oluqhubekayo lweteknoloji yeplastiki, i-polypropylene (PP), i-polytetrafluoroethylene (PTFE) kunye nezinye izinto ezisetyenziselwa ukuveliswa kweeplastiki zeplastiki.Ezi zixhobo zinezixhobo ezingcono zoomatshini kunye nokumelana nokubola, kwaye ziyakwazi ukuziqhelanisa noluhlu olubanzi lweendawo zokusebenza.
Ngeminyaka yee-1970, ngokuvuthwa kobuchwepheshe bevalve yeplastiki, kwaqaliswa iintlobo ngeentlobo zeevalvu zeplastiki ezintsha, ezifana neevalvu ze-polyvinyl fluoride (PVDF), iivalvu zentsimbi yeglasi, njl. njl. ukuziqhelanisa nemeko yokusebenza enzima ngakumbi.
Ekuqaleni kwenkulungwane yama-21, ngokunyuka kolwazi lokhuseleko lwendalo esingqongileyo, iimfuno zeevalvu ziya ziba phezulu nangaphezulu.Ngeli xesha, ezinye izinto ezintsha zeplastiki zazisetyenziselwa ukwenziwa kweevalvu, ezifana ne-polyetherketone (PEEK), i-polyimide (PI) kunye nezinye izinto zeplastiki eziphezulu.Ezi zixhobo zineempawu ezingcono zoomatshini kunye nokuxhathisa ukubola, kwaye zinokuhlangabezana nendawo yokusebenza enzima kakhulu.
Ngamafutshane, kunye nophuhliso loshishino lweekhemikhali kunye nokuvuselelwa okuqhubekayo kobuchwepheshe beplastiki, iivalvu zeplastiki ziye zafumana uphuhliso lwezixhobo zeplastiki ezisebenza kakhulu ukusuka kwizinto zakuqala zePVC ukuza kuthi ga ngoku, ziphucula rhoqo ukuxhathisa kwazo, iipropathi zoomatshini kunye nobubanzi bomhlwa. isicelo, sibe sisixhobo esibalulekileyo nesiyimfuneko kumashishini ekhemikhali, epetrochemical kunye nokhuseleko lokusingqongileyo.
Ixesha lokuposa: Mar-02-2023