I-valve yepulasitiki iwuhlobo olusetshenziswa kabanzi lwe-valve, inezinzuzo zokungagqwala, isisindo esincane, ukumelana nokugqoka, njll. Isetshenziswa kabanzi kumakhemikhali, i-petrochemical, ukuvikelwa kwemvelo nezinye izimboni.Okulandelayo umlando wokuthuthukiswa kwama-valve epulasitiki.
Ngawo-1950, ngokuthuthuka okusheshayo kwemboni yamakhemikhali, isidingo samavalvu sakhula kancane kancane.Ngalesi sikhathi, izinto zepulasitiki ziye zasetshenziswa kabanzi emkhakheni wezimboni, ngakho abanye onjiniyela baqala ukutadisha indlela yokusebenzisa izinto zepulasitiki ekwenzeni ama-valve.Amavalvu epulasitiki akudala akhiqizwa ikakhulukazi kusetshenziswa i-polyvinyl chloride (PVC) impahla, enokumelana nokugqwala okuhle, kepha izakhiwo zayo zemishini zimbi futhi zifaneleka kuphela ukucindezela okuphansi kanye nendawo yokusebenza ephansi.
Ngawo-1960, ngokuthuthukiswa okuqhubekayo kobuchwepheshe bepulasitiki, i-polypropylene (PP), i-polytetrafluoroethylene (PTFE) nezinye izinto zasetshenziswa ekwenzeni ama-valve epulasitiki.Lezi zinto zinezakhiwo ezingcono zemishini kanye nokumelana nokugqwala, futhi zingakwazi ukuzivumelanisa nohlu olubanzi lwezindawo zokusebenza.
Ngawo-1970, ngokuvuthwa kobuchwepheshe be-valve yepulasitiki, izinhlobonhlobo zamavalvu epulasitiki amasha aqalwa, njengamavalvu e-polyvinyl fluoride (PVDF), amavalvu ensimbi yengilazi, njll. Lezi zinto ezintsha zinokusimama okungcono kwamakhemikhali kanye nezakhiwo zemishini, futhi zinga ukuzijwayeza endaweni yokusebenza enzima kakhulu.
Ekuqaleni kwekhulu lama-21, ngokuqwashisa okwandayo kokuvikelwa kwemvelo, izidingo zama-valve ziya ngokuya ziba phezulu.Ngalesi sikhathi, ezinye izinto ezintsha zepulasitiki zazisetshenziswa ekwenzeni amavalvu, njenge-polyetherketone (PEEK), i-polyimide (PI) nezinye izinto zepulasitiki ezisebenza kahle kakhulu.Lezi zinto zinezakhiwo ezingcono zemishini kanye nokumelana nokugqwala, futhi zingahlangabezana nendawo yokusebenza edinga kakhulu.
Ngamafuphi, ngokuthuthukiswa kwemboni yamakhemikhali kanye nokwenziwa okusha okuqhubekayo kobuchwepheshe bepulasitiki, ama-valve epulasitiki abone ukuthuthukiswa kwezinto zepulasitiki ezisebenza kahle kusukela ezintweni zakuqala ze-PVC kuze kube manje, ehlala ethuthukisa ukumelana nokugqwala kwawo, izakhiwo zemishini kanye nobubanzi bomsebenzi. ukufaka isicelo, ekubeni into ebalulekile futhi edingekayo ezimbonini zamakhemikhali, ze-petrochemical kanye nokuvikela imvelo.
Isikhathi sokuthumela: Mar-02-2023