Ukwanda Kokufikelela KweeValvu Zeplastiki

Nangona iivalvu zeplastiki ngamanye amaxesha zibonwa njengemveliso ekhethekileyo—ukhetho oluphezulu lwabo benza okanye bayila iimveliso zeplastiki zemibhobho yeenkqubo zoshishino okanye ekufuneka babe nezixhobo ezicocekileyo kakhulu—ukuba ezi valve azinazo iindlela ezininzi zokusetyenziswa ngokubanzi kukungacingi kakhulu. Enyanisweni, iivalvu zeplastiki namhlanje zinoluhlu olubanzi lokusetyenziswa njengoko iintlobo zezinto ezikhulayo kunye nabayili abalungileyo abazifunayo ezo zinto zithetha iindlela ezininzi zokusebenzisa ezi zixhobo ziguquguqukayo.

IIPROPATI ZEPLASTIKI
Iingenelo zeevalvu zeplastiki zibanzi—ukungagqwali, ukumelana neekhemikhali nokukrweleka; iindonga zangaphakathi ezithambileyo; ubunzima obulula; ukulula kokufakelwa; ixesha elide lokuphila; kunye neendleko eziphantsi zomjikelo wobomi. Ezi ngenelo zikhokelele ekwamkelweni ngokubanzi kweevalvu zeplastiki kwizicelo zorhwebo nezoshishino ezifana nokusasazwa kwamanzi, unyango lwamanzi amdaka, ukucutshungulwa kwesinyithi kunye neekhemikhali, ukutya kunye namayeza, izityalo zamandla, iindawo zokucoca ioyile kunye nokunye.
Iivalvu zeplastiki zinokwenziwa ngezinto ezahlukeneyo ezisetyenziswa kwiindawo ezahlukeneyo. Iivalvu zeplastiki eziqhelekileyo zenziwe nge-polyvinyl chloride (PVC), i-chlorinated polyvinyl chloride (CPVC), i-polypropylene (PP), kunye ne-polyvinylidene fluoride (PVDF). Iivalvu zePVC kunye neCPVC zihlala zidityaniswe neenkqubo zemibhobho ngeziphelo zesokhethi zesamente ezinyibilikayo, okanye iziphelo ezinemisonto nezijijekileyo; ngelixa iPP kunye nePVDF zifuna ukudibana kwezinto zenkqubo yemibhobho, nokuba ziiteknoloji zobushushu, i-butt- okanye i-electro-fusion.

Nangona i-polypropylene inamandla angaphantsi kwesiqingatha se-PVC kunye ne-CPVC, inokumelana neekhemikhali okuguquguqukayo kuba akukho zinyibilikisi zaziwayo. I-PP isebenza kakuhle kwi-acetic acids kunye ne-hydroxides ezixineneyo, kwaye ikwafanelekile kwizisombululo ezithambileyo ze-asidi ezininzi, ii-alkalis, iityuwa kunye neekhemikhali ezininzi ze-organic.

I-PP iyafumaneka njengezinto ezinombala okanye ezingenambala (zendalo). I-PP yendalo yonakaliswa kakhulu yimitha ye-ultraviolet (UV), kodwa iikhompawundi eziqulethe umbala omnyama wekhabhoni ongaphezulu kwe-2.5% zizinzile ngokwaneleyo kwi-UV.

Iinkqubo zemibhobho zePVDF zisetyenziswa kwiindlela ezahlukeneyo zokusebenza kwezoshishino ukusuka kumayeza ukuya kwimigodi ngenxa yamandla ePVDF, ubushushu bokusebenza kunye nokumelana neekhemikhali kwiityuwa, ii-asidi ezinamandla, iziseko ezinyibilikisiweyo kunye nezinye izinyibilikisi ezininzi zendalo. Ngokungafaniyo nePP, iPVDF ayonakaliswa kukukhanya kwelanga; nangona kunjalo, iplastiki ibonakala ngokucacileyo elangeni kwaye inokuveza ulwelo kwimitha ye-UV. Nangona ukwakheka kwendalo, okungenambala wePVDF kulunge kakhulu ekusetyenzisweni ngaphakathi, ukongeza umbala ofana nobomvu wodidi lokutya kuya kuvumela ukuvezwa elangeni ngaphandle kwempembelelo embi kwi-fluid medium.