Nangona kubonakala ngathi yinkcukacha encinci, i-valve's O-ring material ibaluleke kakhulu. Izinto eziphathekayo zinokumisela ukunyamezela kweqondo lokushisa kwesitywina. Ikwanika itywina ukuxhathisa kwikhemikhali, kwaye ezinye iindidi zerabha ziyahambelana nolwelo olwahlukileyo. Izixhobo ezimbini eziqhelekileyo zeevalvu zebhola yomanyano yiViton kunye ne-EPDM.

I-Viton (echazwe ngakwesokudla) yirabha yokwenziwa enekhemikhali ephezulu kunye nokumelana nobushushu. I-EPDM imele i-Ethylene Propylene Diene Monomer kwaye inesethi yayo yeempawu ezenza ukuba ibe yinto eyaziwayo kakhulu ye-O-ring. Xa uthelekisa iViton kunye ne-EPDM, izinto ezininzi kufuneka ziqwalaselwe: ukunyamezela ubushushu, ukuhambelana kweekhemikhali, kunye neendleko. Funda uthelekiso olupheleleyo.

Iimpawu zerabha ze-EPDM
Irabha ye-EPDM (Irabha ye-EPDM) yirabha entsonkothileyo kwaye engabizi kakhulu enoluhlu olubanzi losetyenziso. Ngokuqhelekileyo isetyenziselwa ukuvala amanzi ophahleni ngenxa yokuba i-EPDM itywina kakuhle. Ikwayimathiriyeli eqhelekileyo yokutywinwa kwesikhenkcisi kuba sisigqumatheli kwaye inokumelana nobushushu obuphantsi. Ngokukodwa, i-EPDM isebenza ngokufanelekileyo kwiqondo lokushisa -49F ukuya kwi-293F (-45C ukuya kwi-145C), okwenza kube yinto efanelekileyo kwizicelo nakweyiphi na iqondo lokushisa.

Ngelixa iirubha ezininzi zinokumelana nobushushu obuphezulu, bambalwa kuphela abanokuphatha amaqondo obushushu asezantsi njenge-EPDM. Oku kwenza kube lukhetho lokuqala kuye nabani na ozama ukutywina kwiindawo ezibandayo okanye ngezinto ezibandayo. IiValufa zeBhola yoNyaniso ngeI-EPDM itywinwe i-O-RingsUsetyenziso oluqhelekileyo lwe-EPDM lubandakanya ukugqunywa kombane, iileyile zamachibi, imibhobho yamanzi, abaqokeleli bephaneli yelanga, amakhonkco e-O, nokunye.

Ngaphandle kokunyamezela okukhulu kweqondo lokushisa, i-EPDM inokumelana neekhemikhali ezibanzi. Ezi ziquka amanzi ashushu, umphunga, izinto zokucoca, i-caustic potash solutions, i-sodium hydroxide solutions, ioli ye-silicone / igrisi, kunye nezinye ezininzi i-acids diluted kunye neekhemikhali. Ayifanelekanga ukusetyenziswa kunye neemveliso zeoli yeeminerali ezifana neoli yokuthambisa, ioli okanye i-fuel. Ukuhambelana kweekhemikhali ezithile ze-EPDM, cofa apha. Ezi zakhiwo ezikhangayo, zidibaniswe nexabiso eliphantsi, zenza i-EPDM ibe yinto ethandwa kakhulu yokutywina.

Viton amatywina
IViton yirabha eyenziweyo kunye ne-fluoropolymer elastomer. "I-Fluoropolymer" ithetha ukuba le nto inokumelana okuphezulu kwi-solvents, i-acids kunye neziseko. Igama elithi "elastomer" liguqulelwa ngokusisiseko kunye ne "rabha". Asiyi kuxoxa ngomahluko phakathi kwe-elastomer kunye nerabha apha, kodwa siza kuxubusha ukuba yintoni eyenza iViton ibe yokhethekileyo. Izinto eziphathekayo zihlala zibonakaliswe ngombala ohlaza okanye omdaka, kodwa eyona nto iyahlula kubuninzi bayo. Ubuninzi beViton buphezulu kakhulu kuneentlobo ezininzi zerabha, nto leyo eyenza iViton itywine ibe yenye yezona zinamandla.

I-Viton inoluhlu olubanzi lokunyamezela ubushushu ukusuka kwi -4F ukuya kwi-410F (-20C ukuya kwi-210C). Amaqondo obushushu aphezulu anokumelana neViton yenza ukuba ilungele izicelo zobushushu obuphezulu. IViton isetyenziswa ngokuqhelekileyo kwi-O-rings, iiglavu ezixhathisa iikhemikhali kunye nezinye iimveliso ezibunjiweyo okanye ezikhutshiweyo. I-O-izangqa ezenziwe kwiViton zilungile kwi-scuba diving, ii-injini zemoto kunye neevalvu ezahlukeneyo.

Xa kuziwa ekuxhathiseni imichiza, iViton ayifani. Ixhathisa ukubola ukusuka kwiindidi ezibanzi zolwelo kunye neekhemikhali kunayo nayiphi na i-elastomer engeyiyo i-fluorinated. Ngokungafaniyo ne-EPDM, i-Viton iyahambelana namafutha, i-fuel, i-lubricants kunye ne-inorganic acids ezininzi. Ikwamelana kakhulu noxinzelelo, i-atmospheric oxidation, ukukhanya kwelanga, imozulu, amafutha emoto eneoksijini, iaromatics, umngundo, ukungunda, nokunye. Kananjalo ngokwendalo iyakwazi ukumelana nokutshiswa kunezinye iirabha ezininzi. Funda ngakumbi malunga nokwenziwa kunye nokungamele kwenziwe kwimichiza yeViton.

Ingxaki ephambili yeViton lixabiso layo. Kwimveliso, kubiza malunga namaxesha e-8 ukuvelisa inani elifanayo lezinto eziphathekayo njenge-EPDM. Xa kuthengwa imveliso equlethe kuphela inani elincinci lezinto zerabha, ixabiso alinakuhluka kakhulu. Kodwa xa uodola ngobuninzi, unokulindela ukuba iinxalenye zeViton zibize kakhulu kune-EPDM.

Iimpawu zeViton kunye ne-EPDM
Itshathi ye-Viton vs EPDM yokutywina irabha

Ngoko yeyiphi imathiriyeli eyona ilungileyo? Le mibuzo ayilunganga ngokupheleleyo. Zombini izixhobo zinezicelo ezithile apho zilungele khona, ke konke kuxhomekeke kumsebenzi abaza kuwenza. UC wethuI-PVC Ball Check Valveskunye ne-CPVC Swing Check Valves ziyafumaneka kunye ne-Viton seals okanye i-EPDM seals. Ezi zitywina zenziwe ngee-O-rings ezifakwe kwi-fittings. Ezi zivalo zonke ziyilelwe ukuba ziqhawuke ngokulula ukuze zigcinwe lula, ngoko zinemizimba ekhutshwayo.

Ukuba ufuna i-valve yesistim samanzi, kungakhathaliseki ukuba yiqondo lokushisa, i-valve ene-EPDM seal idla ngokuba yinto ekhethekileyo. Ngaphandle kokunyamezelana kobushushu okwahlukileyo, umahluko omkhulu phakathi kwezi zinto zimbini kukuxhathisa kwazo ngemichiza. IViton ilungile ukuba isetyenziswe ngamafutha kunye nezinye izinto ezidlekayo, kodwa xa ujongana nento engenabungozi njengamanzi, oku kuhlala kugqithise akuyomfuneko.