Ngakhale mavavu apulasitiki nthawi zina amawoneka ngati chinthu chapadera-chisankho chapamwamba cha omwe amapanga kapena kupanga zida zamapaipi apulasitiki pamafakitale kapena omwe ayenera kukhala ndi zida zoyeretsera kwambiri - poganiza kuti ma valvewa alibe ntchito zambiri ndi zazifupi. wowona. Zoona zake, mavavu apulasitiki masiku ano ali ndi ntchito zambiri monga momwe mitundu yowonjezera ya zipangizo ndi okonza abwino omwe amafunikira zipangizozo amatanthauza njira zambiri zogwiritsira ntchito zipangizozi.
ZINTHU ZA PLASTIC
Ubwino wa ma valve a thermoplastic ndi otakata-kudzimbirira, kukana mankhwala ndi abrasion; makoma amkati osalala; kulemera kochepa; mosavuta kukhazikitsa; kuyembekezera moyo wautali; ndi kutsika mtengo kwa moyo. Ubwino umenewu wapangitsa kuti ma valve apulasitiki avomerezedwe m'zinthu zamalonda ndi mafakitale monga kugawa madzi, kuyeretsa madzi otayira, kukonza zitsulo ndi mankhwala, chakudya ndi mankhwala, mafakitale opangira magetsi, mafuta opangira mafuta ndi zina.
Mavavu apulasitiki amatha kupangidwa kuchokera kuzinthu zosiyanasiyana zomwe zimagwiritsidwa ntchito pamasinthidwe angapo. Ma valve odziwika kwambiri a thermoplastic amapangidwa ndi polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), polypropylene (PP), ndi polyvinylidene fluoride (PVDF). Mavavu a PVC ndi CPVC nthawi zambiri amalumikizana ndi mapaipi pogwiritsa ntchito ma socket socket sockets, kapena ulusi ndi nsonga zopindika; pomwe, PP ndi PVDF zimafuna kulumikizidwa kwa zida zamapaipi, mwina pogwiritsa ntchito matekinoloje a kutentha, matako kapena ma electro-fusion.
Mavavu a thermoplastic amapambana kwambiri m'malo ochita dzimbiri, koma ndi othandizanso pamadzi wamba chifukwa alibe lead1, sachita dzimbiri ndipo sachita dzimbiri. PVC ndi CPVC mapaipi ndi mavavu ayenera kuyesedwa ndi certification ku NSF [National Sanitation Foundation] muyezo 61 zotsatira thanzi, kuphatikizapo otsika kufunikira kwa Annex G. Kusankha zinthu zoyenera za madzi zikuwononga akhoza kugwiridwa mwa kufunsa wopanga mankhwala kukana kuwongolera ndi kumvetsetsa momwe kutentha kudzakhudzira mphamvu ya zida zapulasitiki.
Ngakhale polypropylene ili ndi theka la mphamvu za PVC ndi CPVC, imakhala ndi mphamvu zambiri zotsutsana ndi mankhwala chifukwa palibe zosungunulira zodziwika. PP imagwira ntchito bwino mu ma acetic acid ndi ma hydroxides, komanso ndiyoyeneranso njira zochepetsera ma acid ambiri, ma alkali, mchere ndi mankhwala ambiri achilengedwe.
PP imapezeka ngati zinthu zamtundu kapena zopanda pigmented (zachilengedwe). Natural PP imawonongeka kwambiri ndi cheza cha ultraviolet (UV), koma mankhwala omwe ali ndi 2.5% ya carbon black pigmentation ndi UV yokhazikika mokwanira.
Chifukwa thermoplastics imakhudzidwa ndi kutentha, kuthamanga kwa valve kumachepa pamene kutentha kumakwera. Zida zapulasitiki zosiyanasiyana zimakhala ndi deration yofananira ndi kutentha kwakukulu. Kutentha kwamadzi sikuyenera kukhala gwero lotentha lokhalo lomwe lingakhudze kuchuluka kwa mphamvu ya mavavu apulasitiki - kutentha kwakukulu kwakunja kuyenera kukhala gawo loganizira kapangidwe kake. Nthawi zina, kusapanga kwa mipope yakunja kutentha kungayambitse kutsika kwambiri chifukwa chosowa zothandizira chitoliro. PVC ili ndi kutentha kwakukulu kwa utumiki wa 140 ° F; CPVC ili ndi kutentha kwa 220 ° F; PP imakhala ndi kutentha kwa 180 ° F.
Mavavu ampira, ma valavu owunika, ma valve agulugufe ndi ma diaphragm akupezeka muzinthu zosiyanasiyana za thermoplastic za ndandanda 80 yamapaipi amphamvu omwe alinso ndi njira zambiri zochepetsera ndi zowonjezera. Valavu yokhazikika ya mpira nthawi zambiri imapezeka kuti ndiyopanga mgwirizano weniweni kuti ithandizire kuchotsedwa kwa ma valve kuti ikonzedwe popanda kusokoneza mapaipi olumikizira. Ma valve a Thermoplastic cheque amapezeka ngati macheke a mpira, ma cheki opindika, ma y-check ndi ma cone. Mavavu agulugufe amalumikizana mosavuta ndi ma flanges achitsulo chifukwa amagwirizana ndi mabowo a bawuti, mabwalo a bawuti ndi miyeso yonse ya ANSI Class 150. Mkati mwake mkati mwa zigawo za thermoplastic zimangowonjezera kuwongolera bwino kwa ma valve a diaphragm.
Ma valve a mpira mu PVC ndi CPVC amapangidwa ndi makampani angapo aku US ndi akunja kukula kwake 1/2 inchi kudzera mainchesi 6 okhala ndi socket, ulusi kapena flanged. Mapangidwe enieni a mgwirizano wamavavu ampira amakono amaphatikiza mtedza awiri omwe amamangirira pathupi, kukanikiza zisindikizo za elastomeric pakati pa thupi ndi zolumikizira mapeto. Opanga ena akhala ndi valavu yofanana ya mpira ndi ulusi wa mtedza kwa zaka zambiri kuti alole kusintha kosavuta kwa mavavu akale popanda kusinthidwa kwa mapaipi olumikizana.
Kuyika valavu ya gulugufe wa pulasitiki ndikosavuta chifukwa mavavuwa amapangidwa kuti akhale mawonekedwe opindika okhala ndi zisindikizo za elastomeric zomwe zimapangidwira m'thupi. Iwo safuna Kuwonjezera wa gasket. Pokhala pakati pa nthiti ziwiri zokwerera, kutsekereza kwa vavu ya gulugufe wa pulasitiki kuyenera kusamaliridwa mosamala pokwerera kokeki kovomerezeka m'magawo atatu. Izi zimachitidwa kuti zitsimikizire kuti chisindikizo chofanana pamtunda komanso kuti palibe kupanikizika kwa makina komwe kumagwiritsidwa ntchito pa valve.
Nthawi yotumiza: Dec-24-2019 