Udinga ivalvu yomgca weekhemikhali, kodwa i-PVC eqhelekileyo ayisiyondlela ifanelekileyo. Ukukhetha izinto ezingalunganga kunokubangela ukuvuza, ukuchitheka okuyingozi, kunye nomonakalo obiza kakhulu kwinkqubo yakho yonke.

Ivalvu yebhola yePP yivalvu evaliweyo eyenziwe ngepolypropylene, ipolymer yethermoplastic. Ikhethwe ngokukodwa ngenxa yokuxhathisa kwayo okungaqhelekanga kwiindidi ezahlukeneyo ze-asidi, iziseko, kunye nezinyibilikisi zeekhemikhali, ingakumbi apho iPVC ingaphumeleli khona.

Xa ndithetha namaqabane am afana noBudi e-Indonesia, incoko idla ngokudlula ukusetyenziswa kwamanzi okuqhelekileyo. Uninzi lwabathengi bakhe basebenza kumashishini afana nokucubungula iikhemikhali okanye unyango lwamanzi, apho ulwelo lunamandla kakhulu kunamanzi aqhelekileyo. Kule misebenzi, sebenzisa nje umgangatho oqhelekileyo.ivalvu yePVCakwanelanga. Udinga izinto ezakhelwe ukujongana neemeko ezinzima ngaphandle kokuwohloka. Ezo zinto zihlala ziyi-polypropylene, okanye i-PP. Zibonelela ngokhuseleko kunye nokuthembeka okufunekayo kwezi zicelo zibalulekileyo zoshishino.

Ithini ifom epheleleyo ye-PP kwiivalvu?

Ubona "i-PP" idweliswe kwikhathalogu kodwa awuqinisekanga ukuba imele ntoni. Oku kwenza kube nzima ukukhangela iipropati zayo okanye ukuchaza izibonelelo zayo kubathengi bakho ngokuzithemba.

Uhlobo olupheleleyo lwe-PP kwiivalvu yiPolypropylene. Yi-thermoplastic eqinileyo nekhaphukhaphu eyinxalenye yosapho olunye lweplastiki njengePVC (Polyvinyl Chloride) kunye nePE (Polyethylene).

I-Polypropylene yenye yeplastiki ezinokusetyenziswa ngeendlela ezininzi ehlabathini. Yinto esebenzayo esetyenziswa kuyo yonke into ukusuka kwiindawo zeemoto ukuya kwizixhobo zelebhu ngenxa yeempawu zayo ezikhethekileyo. Kwihlabathi leevalvu kunye neepayipi, inzuzo yayo ephambili kukuba iyamangalisa.ukumelana neekhemikhaliNgokungafaniyo nePVC, inokusingatha ii-asidi ezininzi ezinamandla, ii-alkali, kunye nezinyibilikisi ze-organic ngaphandle kokuqhekeka. Yingakho thina ePntek sinomgca okhethekileyo weIivalvu zePPSiyazi ukuba kwimisebenzi ethile yemizi-mveliso, akukho nto inokuthatha indawo yayo. Ukuqonda ukuba igama elithi “PP” lithetha ukuba i-“polypropylene” linyathelo lokuqala lokukhetha ivalvu efanelekileyo yokusetyenziswa kweekhemikhali ezinzima.

I-Polypropylene (PP) xa ithelekiswa ne-Polyvinyl Chloride (PVC)

Ipropati	I-Polypropylene (PP)	I-Polyvinyl Chloride (PVC)
Igama lezinto	I-Polypropylene	I-Polyvinyl Chloride
Ukusetyenziswa Okuphambili	Ishishini leekhemikhali, iilebhu, i-electroplating, izicelo zemizi-mveliso.	Uthutho lwamanzi, unkcenkceshelo, imibhobho yamanzi emakhaya, amachibi okuqubha.
Ukumelana neekhemikhali	Igqwesile; ingakumbi ngokuchasene nee-asidi, iziseko, kunye nezinyibilikisi.	Kulungile; kodwa isengozini kwizinyibilikisi ezithile kunye neekhompawundi zekhlorini.
Umda woBushushu	Ingaphezulu; idla ngokuphatha ulwelo ukuya kuthi ga kwi-80-90°C (175-195°F).	Ezantsi; idla ngokukhawulelwa kuma-60°C (140°F).
Indlela yoQhagamshelo	Ukudibanisa ubushushu (ukuwelda) kuqhelekile, kukwafumaneka neesokhethi/imisonto	Isamente yesinyibilikisi (ukuncamathelisa) kwiziphelo zesokhethi, ukuthungela imisonto.

Yintoni ibhola yePP?

Ubona ivalvu enomzimba wePVC kodwa ibhola yePP. Olu xube lwezinto lubonakala lungaqhelekanga, uze uzibuze ukuba ingaba yindlela yokunciphisa iindleko okanye luphawu olunenjongo yokwenyani.

Ibhola yePP yingqukuva ejikelezayo ngaphakathi kwevalvu eyenziwe ngepolypropylene. Ukusebenzisa ibhola yePP ngaphakathi kwevalvu yePVC lukhetho loyilo olukrelekrele oluphucula ukumelana neekhemikhali kwisiseko sevalvu ngelixa kugcinwa iindleko ziphantsi.

Le yingongoma eqhelekileyo ekuthethwa ngayo. Ibhola kunye nezihlalo ziindawo zevalvu ezihlala zidibana nolwelo, nokuba ivalvu ivaliwe. Zibizwa ngokuba “iindawo ezimanzi.” Kwelinye icala, umzimba wevalvu ubonakala kuphela xa ivalvu ivuliwe. Kwizicelo ezinolwelo olune-corrosive kancinci, usenokungadingi ukuba umzimba wevalvu wonke wenziwe ngezinto ezibizayo nezikumgangatho ophezulu. Ngokusebenzisaibhola yePP enganyangekiyo ngamakhemikhalingaphakathi komzimba oqhelekileyo wePVC, senza i-PVC engabizi kakhuluivalvuoko kusabonelela ngokhuseleko oluphuculweyo apho kubaluleke khona kakhulu. Kumalunga nokubonelela ngesisombululo esijolise ekulinganiseni ukusebenza kunye nohlahlo-lwabiwo mali kwiimfuno ezithile zamaqabane ethu.

Ingakanani inqanaba loxinzelelo lwevalvu yebhola yePP?

Uyazi ukuba i-PP ilungile kwiikhemikhali, kodwa ngaba ingakwazi ukumelana noxinzelelo? Ukusebenzisa ivalvu engaqwalaselwanga kakuhle kuyingozi enkulu kukhuseleko enokubangela ukuba inkqubo iqhume kwaye ichitheke iikhemikhali eziyingozi.

Umlinganiselo woxinzelelo lweevalvu zebhola zePP zePntek yiPN16, eyi-16 bar okanye malunga ne-235 PSI kubushushu begumbi (20°C). Kubalulekile ukukhumbula ukuba olu mgangatho luyehla njengoko ubushushu bolwelo busanda. Soloko ujonga itshathi yoxinzelelo-lobushushu bomenzi.

ZethuIivalvu zebhola zePPePntek banomgangatho oqinileyo we-PN16. Oku kuthetha ukuba banokuphatha uxinzelelo lwe-16 bar, olumalunga ne-235 PSI. Olu mgangatho uphezulu luphawu lomgangatho wemizi-mveliso, kodwa alulo ibali elipheleleyo. Eyona nto ibalulekileyo endiyichazayo kumaqabane anjengoBudi kukuba olu mgangatho woxinzelelo luqhagamshelwe ngokuthe ngqo kubushushu bolwelo. Zonke ii-thermoplastics, kuquka ne-polypropylene, ziyathamba kwaye zingaqini njengoko zishushu ngakumbi. Njengoko izinto zithambile, amandla azo okulawula uxinzelelo ayancipha kakhulu. Ukungayinaki le curve 'iphazamisayo' ayisiyonto imbi nje kuphela; kuyingozi. Sibonelela ngetshathi ecacileyo enezivalo zethu ukuthintela ukusilela kwenkqubo nokuqinisekisa ukuba ukhuseleko lwabathengi bethu luhlala luyinto ephambili.

Indima Ebalulekileyo Yokunciphisa Ubushushu

Ubushushu bolwelo	Uxinzelelo Oluphezulu Lokusebenza (iValve yePN16)
20°C (68°F)	Ibha ye-16 (235 PSI)
60°C (140°F)	Ibha eyi-6.4 (94 PSI)
80°C (176°F)	Ibha eyi-3.2 (47 PSI)

Qaphela: Lo ngumzekelo wevalvu ye-PN16. Soloko ujonga iphepha ledatha le-Pntek elithile ukuze ufumane amanani achanekileyo.

Yintoni ivalvu yePP-H?

Udibana neentlobo ezahlukeneyo ze-PP, ezifana ne-“PP-H.” Awuqinisekanga ukuba ithetha ukuthini i-“-H” okanye ukuba yinto eyahlukileyo ekufuneka uyixhalabele xa uodola.

Ivalvu yePP-H yenziwe ngePolypropylene Homopolymer. Olu luhlobo oluthile, oluqinileyo kakhulu lwePP olwaziwa ngamandla ayo agqwesileyo, ukuqina kwayo, kunye nokusebenza kwayo kumaqondo obushushu aphezulu, nto leyo eyenza ukuba ifaneleke kwiivalvu kunye nezixhobo zoshishino.

Ayizizo zonke iipolypropylene ezidalwe ngokulinganayo. U-“-H” umele iHomopolymer, oko kuthetha ukuba iplastiki yenziwe ngohlobo olunye kuphela lwebhloko yokwakha yemonomer (ipropylene). Oku kubangela ukuba kubekho izinto eziqinileyo neziqinileyo, nto leyo kanye oyifunayo kwi-valve body ekufuneka iqulathe uxinzelelo oluphezulu kwaye imelane nokugoba. Kukho ezinye iintlobo, ezifana neecopolymers (PP-B, PP-R), ezenziwe ngokongeza enye imonomer. Ezi ezinye iintlobo ziguquguquka ngakumbi okanye zinamandla angcono okuchaphazela kumaqondo obushushu aphantsi, nto leyo ezenza zifaneleke kwezinye izinto, njengemibhobho ekufuneka igobe. KwiPntek, sikhetha iPP-H kwiivalvu zethu zoshishino kuba ukuqina kwayo kunye nokumelana nobushushu kubonelela ngokusebenza okungcono kunye nobomi benkonzo obude.

Iindidi eziqhelekileyo zePolypropylene

Uhlobo	Igama eliphelele	Iipropati eziphambili	Eyona ndlela ilungileyo yokusebenzisa
I-PP-H	I-Homopolymer	Ukuqina okuphezulu, amandla, ukumelana okugqwesileyo kobushushu kunye neekhemikhali.	Iivalvu, izixhobo zoshishino, iitanki zeekhemikhali.
I-PP-B	I-Block Copolymer	Amandla aphezulu okuchaphazela, ingakumbi kumaqondo obushushu aphantsi.	Iibhokisi zebhetri, iindawo zoshishino ezifuna ukuqina okunamandla.
I-PP-R	I-Copolymer engacwangciswanga	Ithambile, iguquguquka ngakumbi, iyakwazi ukumelana nobushushu ixesha elide.	Imibhobho yamanzi ashushu nabandayo.

Isiphelo

A Ivalvu yebhola yePPlicandelo elibalulekileyo lokuphatha iikhemikhali ngokukhuselekileyo. Ngokuqonda iimpawu zayo zezinto, imida yoxinzelelo, kunye namanqanaba ahlukeneyo afana ne-PP-H, ungakhetha ivalvu efanelekileyo kwimisebenzi yemizi-mveliso enzima.