Mavavu a PVC (PolyVinyl Chloride) amagwiritsidwa ntchito kwambiri ndi mavavu apulasitiki otseka.Vavu ili ndi mpira wozungulira wokhala ndi bore.Potembenuza mpirawo kotala kutembenuka, bore ndi inline kapena perpendicular kwa mapaipi ndipo otaya amatsegulidwa kapena otsekedwa.Mavavu a PVC ndi olimba komanso okwera mtengo.Kuphatikiza apo, amatha kugwiritsidwa ntchito pazinthu zosiyanasiyana, kuphatikiza madzi, mpweya, mankhwala owononga, ma acid ndi maziko.Poyerekeza ndi mavavu amkuwa kapena zitsulo zosapanga dzimbiri, amavotera kutentha kwapansi ndi kupanikizika ndipo amakhala ndi mphamvu zochepa zamakina.Amapezeka ndi zolumikizira zosiyanasiyana zamapaipi, monga zosungunulira (kulumikizana kwa glue) kapena ulusi wa chitoliro.Ma valve ophatikizana awiri, kapena ma valve ogwirizana, ali ndi malekezero olumikizira mapaipi osiyana omwe amakhazikika ku thupi la vavu polumikizana ndi ulusi.Valavu imatha kuchotsedwa mosavuta kuti ilowe m'malo, kuyang'ana ndi kuyeretsa.
Kupanga PolyVinyl Chloride
PVC imayimira PolyVinyl Chloride ndipo ndi yachitatu yogwiritsidwa ntchito kwambiri polima pambuyo pa PE ndi PP.Amapangidwa ndi zomwe 57% chlorine mpweya ndi 43% ethylene mpweya.Mpweya wa klorini umachokera ku electrolysis yamadzi a m'nyanja, ndipo mpweya wa ethylene umapezeka ndi distillation yamafuta osakanizidwa.Poyerekeza ndi mapulasitiki ena, kupanga PVC kumafuna mafuta ochepa kwambiri (PE ndi PP zimafuna pafupifupi 97% ethylene gasi).Chlorine ndi ethylene zimachita ndikupanga ethanedichlorine.Izi zimakonzedwa kuti zipereke Vinylchlorine monomer.Nkhaniyi imapangidwa ndi polymerized kuti ipange PVC.Potsirizira pake, zina zowonjezera zimagwiritsidwa ntchito kusintha zinthu monga kuuma ndi elasticity.Chifukwa cha njira yosavuta yopangira komanso kupezeka kwakukulu kwa zopangira, PVC ndi yotsika mtengo komanso yokhazikika poyerekeza ndi mapulasitiki ena.PVC ili ndi kukana kwambiri ku dzuwa, mankhwala ndi okosijeni kuchokera m'madzi.
Zithunzi za PVC
Mndandanda womwe uli m'munsimu umapereka chithunzithunzi chazofunikira zazinthuzo:
- Moyo wopepuka, wamphamvu komanso wautali
- Oyenera kubwezerezedwanso komanso kuchepa kwa chilengedwe poyerekeza ndi mapulasitiki ena
- Nthawi zambiri amagwiritsidwa ntchito pazaukhondo, monga madzi akumwa.PVC ndi chinthu chofunikira chomwe chimagwiritsidwa ntchito posungira kapena kusamutsa zakudya.
- Kugonjetsedwa ndi mankhwala ambiri, ma asidi ndi maziko
- Ma valve ambiri a mpira wa PVC mpaka ku DN50 ali ndi kupanikizika kwakukulu kwa PN16 (16 bar pa firiji).
PVC ili ndi malo ochepetsetsa otsika komanso osungunuka.Choncho, sikovomerezeka kugwiritsa ntchito PVC pa kutentha pamwamba pa 60 digiri Celsius (140 ° F).
Mapulogalamu
Ma valve a PVC amagwiritsidwa ntchito kwambiri pakuwongolera madzi ndi ulimi wothirira.PVC ndiyoyeneranso kupangira zinthu zowononga, monga madzi am'nyanja.Kuphatikiza apo, zinthuzo zimagonjetsedwa ndi ma acid ambiri ndi maziko, mchere wothira mchere komanso zosungunulira organic.M'malo omwe mankhwala owononga ndi ma acid amagwiritsidwa ntchito, PVC nthawi zambiri imasankhidwa pamwamba pazitsulo zosapanga dzimbiri.PVC ilinso ndi zovuta zina.Chofunikira kwambiri ndichakuti PVC yokhazikika siyingagwiritsidwe ntchito pa kutentha kwapa media kuposa 60 ° C (140 ° F).PVC sichigonjetsedwa ndi ma hydrocarbon onunkhira komanso okolorini.PVC ili ndi mphamvu zochepa zamakina kuposa mkuwa kapena zitsulo zosapanga dzimbiri, motero mavavu a PVC nthawi zambiri amakhala otsika kwambiri (PN16 ndi yachilendo kwa ma valve mpaka DN50).Mndandanda wamisika yomwe ma valve a PVC amagwiritsidwa ntchito:
- Kuthirira m'nyumba / akatswiri
- Kuchiza madzi
- Maonekedwe a madzi ndi akasupe
- Aquariums
- Zotayiramo nthaka
- Maiwe osambira
- Chemical processing
- Kukonza chakudya
Nthawi yotumiza: May-30-2020