I-valve yepulasitiki uhlobo olusetshenziswa kabanzi lwe-valve, inezinzuzo zokumelana nokugqwala, isisindo esikhanyayo, ukugqokwa kwemvelo, njll. Isetshenziswa kabanzi kumakhemikhali, i-petrochemical, ukuvikelwa kwemvelo kanye neminye imikhakha. Okulandelayo umlando wentuthuko wama-valve epulasitiki.
Ngawo-1950s, ngokuthuthuka okusheshayo kwemboni yamakhemikhali, kwandiswa kancane kancane. Ngalesi sikhathi, izinto zepulasitiki zisetshenziswe kabanzi ensimini yezimboni, ngakho-ke abanye onjiniyela baqala ukutadisha indlela yokusebenzisa izinto zepulasitiki ekwenziweni kwama-valve. Ama-valve asemapulasitiki asekuqaleni ayekhiqizwa ngokuyinhloko kusetshenziswa izinto ezibonakalayo ze-polyvinyl chloride (PVC), ezinokumelana kahle nokugqwala, kepha izakhiwo zalo zemishini zimpofu futhi zilungele ingcindezi ephansi nemvelo yokushisa okuphansi.
Ngawo-1960s, ngokuthuthuka okuqhubekayo kobuchwepheshe bePlastiksi, i-POYPROPYLENE (PP), i-polytetrafluoroethylene (PTFE) nezinye izinto zasetshenziswa ekwenziweni kwama-valve epulasitiki. Lezi zinto zokwenziwa zinezakhiwo ezingcono zokwenziwa kanye nokuphikiswa kokugqwala, futhi zingazivumelanisa nezimo eziningi ezibanzi zezindawo zokusebenza.
Ngawo-1970s, ngokuvuthwa kobuchwepheshe be-valve yepulasitiki, kwethulwa izinhlobo eziningi zepulasitiki, njenge-polyvinyl fluoride (pvdf) ama-fluoride (ama-valves e-glass, njll .. Lezi zinto ezintsha zinokuqina okungcono kwamakhemikhali kanye nezakhiwo zemishini, futhi zikwazi ukuzivumelanisa nezimo ezifuna ukusebenza ngokwengeziwe.
Ekuqaleni kwekhulu lama-21, ngokuqwashisa ngokwanda kokuvikelwa kwemvelo, izidingo zama-valve ziya ziphakeme futhi ziphakeme. Ngalesi sikhathi, kwakusetshenziswa ezinye izinto zepulasitiki ezintsha ekwenziweni kwama-valves, njenge-polytheketone (Peek), i-polymide (PI) nezinye izinto zepulasitiki eziphezulu. Lezi zinto zokwenziwa zinezakhiwo ezingcono zokwenziwa kanye nokumelana nokugqwala, futhi kungahlangabezana nemvelo yokusebenza efuna kakhulu.
Ngamafuphi, ngokuthuthukiswa komkhakha wamakhemikhali kanye nokwenziwa okusha okuqhubekayo kobuchwepheshe bePlastiksi, ama-valves epulasitiki athole ukuthuthukiswa kwezinto zokwenziwa kwepulasitiki eziphezulu ezivela ezintweni zokuqala zePVC kuze kube manje, zithuthukisa imishini yazo Isicelo, ukuba yimishini ebalulekile futhi ebaluleke kakhulu yezimboni zamakhemikhali, ze-petrochemical nezemvelo.
Isikhathi sePosi: Mar-02-2023