Ukwanda Kokufinyelela Kwamavalvu Epulasitiki

Nakuba ama-valve epulasitiki ngezinye izikhathi ebhekwa njengomkhiqizo okhethekile—ukukhetha okuphezulu kwalabo abenza noma abaklama imikhiqizo yamapayipi epulasitiki yezinhlelo zezimboni noma okumele babe nemishini ehlanzekile kakhulu—uma la ma-valve engenazo izinto eziningi ezijwayelekile kuwukungacabangi kahle. Eqinisweni, ama-valve epulasitiki namuhla anokusetshenziswa okubanzi njengoba izinhlobo zezinto ezikhulayo kanye nabaklami abahle abadinga lezo zinto zisho izindlela eziningi zokusebenzisa la mathuluzi anokuguquguquka.

IZAKHIWO ZEPULASTIKI
Izinzuzo zamavalvu epulasitiki zibanzi—ukugqwala, ukumelana namakhemikhali nokuklwebheka; izindonga zangaphakathi ezibushelelezi; isisindo esincane; ukulula kokufakwa; isikhathi sokuphila isikhathi eside; kanye nezindleko eziphansi zomjikelezo wokuphila. Lezi zinzuzo ziholele ekwamukelweni kabanzi kwamavalvu epulasitiki ezisetshenziswa kwezentengiselwano nasezimbonini njengokusatshalaliswa kwamanzi, ukwelashwa kwamanzi angcolile, ukucubungula insimbi namakhemikhali, ukudla nemithi, izitshalo zikagesi, izindawo zokuhlanza uwoyela nokuningi.
Amavalvu epulasitiki angenziwa ngezinto eziningi ezahlukene ezisetshenziswa ezimisweni eziningana. Amavalvu epulasitiki avame kakhulu enziwe nge-polyvinyl chloride (PVC), i-chlorinated polyvinyl chloride (CPVC), i-polypropylene (PP), kanye ne-polyvinylidene fluoride (PVDF). Amavalvu e-PVC kanye ne-CPVC avame ukuhlanganiswa nezinhlelo zamapayipi ngeziphetho zesokhethi zokusimisa ezi-solvent, noma iziphetho ezinentambo nezi-flanged; kanti i-PP kanye ne-PVDF zidinga ukuhlanganiswa kwezingxenye zesistimu yamapayipi, kungaba ubuchwepheshe bokushisa, i-butt noma i-electro-fusion.

Nakuba i-polypropylene inamandla ayingxenye ye-PVC ne-CPVC, inokumelana kwamakhemikhali okuguquguqukayo kakhulu ngoba azikho izinyibilikisi ezaziwayo. I-PP isebenza kahle kuma-acetic acid nama-hydroxide aqinile, futhi ifaneleka nezixazululo ezithambile zama-acid amaningi, ama-alkali, usawoti kanye namakhemikhali amaningi e-organic.

I-PP iyatholakala njengento enombala noma engenawo umbala (wemvelo). I-PP yemvelo yonakaliswa kakhulu yimisebe ye-ultraviolet (UV), kodwa amakhemikhali aqukethe umbala omnyama wekhabhoni ongaphezu kuka-2.5% aqiniswa ngokwanele yi-UV.

Izinhlelo zamapayipi e-PVDF zisetshenziswa ezinhlotsheni ezahlukene zezimboni kusukela kwezemithi kuya kwezezimayini ngenxa yamandla e-PVDF, izinga lokushisa lokusebenza kanye nokumelana kwamakhemikhali nosawoti, ama-asidi aqinile, izisekelo ezincibilikisiwe kanye nezinyibilikisi eziningi eziphilayo. Ngokungafani ne-PP, i-PVDF ayonakaliswa ukukhanya kwelanga; noma kunjalo, ipulasitiki iyabonakala elangeni futhi ingaveza uketshezi emisebeni ye-UV. Ngenkathi ukwakheka kwemvelo kwe-PVDF okungenambala kuhle kakhulu ekusetshenzisweni kwangaphakathi okuhlanzekile kakhulu, ukwengeza umbala obomvu njengombala obomvu wokudla kungavumela ukuvezwa elangeni ngaphandle komphumela omubi endaweni yoketshezi.