Ngakhale zitha kuwoneka ngati zazing'ono, zida za O-ring ya valve ndizofunikira kwambiri. Zinthuzi zimatha kudziwa kutentha kwa chisindikizocho. Imaperekanso chisindikizo kukana mankhwala, ndipo mitundu ina ya mphira imagwirizana ndi madzi osiyanasiyana. Zida ziwiri zodziwika bwino zama valve ogwirizana ndi Viton ndi EPDM.

Viton (chithunzi kumanja) ndi mphira wopangidwa ndi mankhwala komanso kutentha kwambiri. EPDM imayimira Ethylene Propylene Diene Monomer ndipo ili ndi zida zake zomwe zimapangitsa kuti ikhale yotchuka kwambiri ya O-ring material. Poyerekeza Viton ndi EPDM, zifukwa zingapo ziyenera kuganiziridwa: kulekerera kutentha, kugwirizanitsa mankhwala, ndi mtengo. Werengani kuti mufananize kwathunthu.

Zisindikizo za mphira za EPDM
EPDM rabara (Mtengo wa EPDM) ndi rabara yovuta komanso yotsika mtengo yomwe imagwiritsidwa ntchito mosiyanasiyana. Nthawi zambiri amagwiritsidwa ntchito poletsa madzi padenga chifukwa EPDM imasindikiza bwino. Ndichinthu chodziwika bwino pazisindikizo zafiriji chifukwa ndi insulator ndipo imakhala ndi kukana kutentha kwambiri. Mwachindunji, EPDM imagwira ntchito bwino pa kutentha kwa -49F mpaka 293F (-45C mpaka 145C), ndikupangitsa kuti ikhale yabwino kwa mapulogalamu pa kutentha kulikonse.

Ngakhale ma rubber ambiri ndi otsika kwambiri kutentha, owerengeka okha ndi omwe amatha kutentha kwambiri monga EPDM. Izi zimapangitsa kukhala chisankho choyamba kwa aliyense amene akuyesera kusindikiza kumalo ozizira kapena ndi zipangizo zozizira. True Union Ball Valves yokhala ndiEPDM Yosindikizidwa O-RingsZomwe zimagwiritsidwa ntchito pa EPDM zimaphatikizapo kutchinjiriza kwa magetsi, zomangira dziwe, mapaipi, otolera ma solar panel, mphete za O, ndi zina zambiri.

Kuphatikiza pa kulekerera kwakukulu kwa kutentha, EPDM ili ndi kukana kwakukulu kwa mankhwala. Izi zikuphatikizapo madzi otentha, nthunzi, zotsukira, potashi potashi solutions, sodium hydroxide solutions, silicone mafuta/mafuta, ndi zina zambiri kuchepetsedwa zidulo ndi mankhwala. Sikoyenera kugwiritsidwa ntchito ndi zinthu zamafuta amchere monga mafuta opaka, mafuta kapena mafuta. Kuti mufanane ndi mankhwala a EPDM, dinani apa. Zinthu zochititsa chidwizi, kuphatikizapo mtengo wake wotsika, zimapangitsa EPDM kukhala chinthu chosindikizira chodziwika kwambiri.

Zisindikizo za Viton
Viton ndi mphira wopangidwa ndi fluoropolymer elastomer. "Fluoropolymer" amatanthauza kuti zinthu zimenezi ali mkulu kukana zosungunulira, zidulo ndi zapansi. Mawu oti "elastomer" amatha kusinthika ndi "rabala". Sitikambirana za kusiyana pakati pa elastomer ndi rabara pano, koma tikambirana zomwe zimapangitsa Viton kukhala wapadera kwambiri. Nkhaniyi nthawi zambiri imadziwika ndi mtundu wobiriwira kapena bulauni, koma chomwe chimasiyanitsa ndi kuchuluka kwake. Kuchulukana kwa Viton ndikokwera kwambiri kuposa mitundu yambiri ya mphira, zomwe zimapangitsa kuti Viton asindikize kukhala amphamvu kwambiri.

Viton ili ndi kulekerera kutentha kwakukulu kuchokera ku -4F mpaka 410F (-20C mpaka 210C). Kutentha kwakukulu komwe Viton amatha kupirira kumapangitsa kuti ikhale yabwino kwa ntchito zotentha kwambiri. Viton amagwiritsidwa ntchito kwambiri mu O-mphete, magolovesi osamva mankhwala ndi zinthu zina zoumbidwa kapena zotulutsidwa. O-mphete opangidwa kuchokera ku Viton ndi abwino kwa scuba diving, injini zamagalimoto ndi ma valve osiyanasiyana.

Pankhani ya kukana kwa mankhwala, Viton ndi yosayerekezeka. Imalimbana ndi dzimbiri kuchokera kumadzi ndi mankhwala osiyanasiyana kuposa elastomer iliyonse yopanda fulorojeni. Mosiyana ndi EPDM, Viton imagwirizana ndi mafuta, mafuta, mafuta odzola ndi ma inorganic acid. Imalimbananso kwambiri ndi kuponderezedwa, kutsekemera kwa mpweya, kuwala kwa dzuwa, nyengo, mafuta agalimoto okhala ndi okosijeni, zonunkhira, bowa, nkhungu, ndi zina zambiri. Komanso mwachibadwa sichimva kupsa kuposa ma raba ena ambiri. Werengani zambiri za zomwe muyenera kuchita ndi zomwe musachite za mankhwala a Viton.

Vuto lalikulu ndi Viton ndi mtengo wake. Popanga, zimawononga pafupifupi 8 kuwirikiza kawiri kuti apange zinthu zomwezo monga EPDM. Pogula mankhwala omwe ali ndi zinthu zochepa za labala, mtengo sungakhale wosiyana kwambiri. Koma poyitanitsa zambiri, mutha kuyembekezera kuti magawo a Viton akhale okwera mtengo kwambiri kuposa EPDM.

Viton ndi EPDM zisindikizo
Viton vs EPDM Kusindikiza Rubber Tchati

Ndiye ndi zinthu ziti zomwe zili zabwino kwambiri? Mafunso amenewa si abwino kwenikweni. Zida zonsezi zili ndi ntchito zomwe zili zabwino kwambiri, chifukwa chake zimatengera ntchito yomwe azigwira. C wathuPVC Mpira Onani Mavavundi CPVC Swing Check Valves zilipo ndi Viton zisindikizo kapena EPDM zisindikizo. Zisindikizo izi zimapangidwa ndi mphete za O zomwe zimayikidwa muzowonjezera. Ma valve onsewa amapangidwa kuti azitha kupasuka mosavuta kuti asamalidwe mosavuta, motero amakhala ndi matupi ochotsedwa.

Ngati mukufuna valavu yamadzimadzi, mosasamala kanthu za kutentha, valve yokhala ndi chisindikizo cha EPDM nthawi zambiri ndiyo yabwino kwambiri. Kupatula kulekerera kutentha kosiyana pang'ono, kusiyana kwakukulu pakati pa zida ziwirizi ndikukana kwawo kwamankhwala. Viton ndi yabwino kugwiritsidwa ntchito ndi mafuta ndi zinthu zina zowononga, koma pochita ndi chinthu chopanda vuto ngati madzi, kulimba kwambiri kumeneku sikofunikira.