Nakuba kungase kubonakale njengento encane, izinto ze-O-ring ze-valve zibaluleke kakhulu. Izinto zinganquma ukubekezelela izinga lokushisa kwe-seal. Futhi zinikeza i-seal ukumelana namakhemikhali, kanti ezinye izinhlobo zerabha ziyahambisana noketshezi oluhlukene. Izinto ezimbili ezivamile zama-valve ebhola e-union yangempela yi-Viton ne-EPDM.

I-Viton (esithombeni ngakwesokudla) iyirabha yokwenziwa enokumelana okuphezulu kwamakhemikhali kanye nokushisa. I-EPDM imele i-Ethylene Propylene Diene Monomer futhi inezakhiwo zayo ezenza ibe yinto ethandwa kakhulu ye-O-ring. Uma uqhathanisa i-Viton ne-EPDM, izici eziningana kumele zicatshangelwe: ukubekezelela izinga lokushisa, ukuhambisana kwamakhemikhali, kanye nezindleko. Qhubeka ufunda ukuze uthole ukuqhathanisa okugcwele.

Izimpawu zerabha ze-EPDM
Irabha ye-EPDM (Irabha ye-EPDM) iyirabha eyinkimbinkimbi futhi engabizi kakhulu enezinhlobo eziningi zokusetshenziswa. Ngokuvamile isetshenziselwa ukuvikela uphahla ngoba i-EPDM iyavala kahle. Futhi iyinto evamile yokuvala amafriji ngoba iyisivikelo futhi inokumelana okuhle kakhulu nokushisa okuphansi. Ngokukhethekile, i-EPDM isebenza kahle ebangeni lokushisa eliphakathi kuka--49F no-293F (-45C kuya ku-145C), okwenza ifaneleke ukusetshenziswa kunoma yiliphi izinga lokushisa.

Nakuba amarabha amaningi emelana nokushisa okuphezulu, ambalwa kuphela angamelana nokushisa okuphansi njenge-EPDM. Lokhu kwenza kube ukukhetha kokuqala kunoma ubani ozama ukuvala ezindaweni ezibandayo noma ngezinto ezibandayo. Ama-True Union Ball Valve ane-Ama-O-Rings avaliwe e-EPDMIzicelo ezijwayelekile ze-EPDM zifaka phakathi ukufakelwa kokushisa ngogesi, ulwelwesi lwamachibi, amapayipi, abaqoqi bamaphaneli elanga, ama-O-rings, nokuningi.

Ngaphezu kokubekezelela amazinga okushisa aphezulu, i-EPDM inokumelana okukhulu kwamakhemikhali. Lokhu kufaka phakathi amanzi ashisayo, umusi, insipho, izixazululo ze-caustic potash, izixazululo ze-sodium hydroxide, uwoyela/amafutha e-silicone, kanye namanye ama-asidi namakhemikhali amaningi axutshwe. Ayifanele ukusetshenziswa nemikhiqizo yamafutha amaminerali njengamafutha okugcoba, uwoyela noma amafutha. Ukuze uthole ukuhambisana kwamakhemikhali athile kwe-EPDM, chofoza lapha. Lezi zakhiwo ezihlaba umxhwele, zihlanganiswe nentengo yayo ephansi, zenza i-EPDM ibe yinto ethandwa kakhulu yokuvala.

Izimpawu ze-Viton
I-Viton iyirabha yokwenziwa kanye ne-fluoropolymer elastomer. Igama elithi “Fluoropolymer” lisho ukuthi le nto inokumelana okuphezulu nezinyibilikisi, ama-acid kanye nezisekelo. Igama elithi “elastomer” lingashintshaniswa ngokuyisisekelo nelithi “irabha”. Ngeke sixoxe ngomehluko phakathi kwe-elastomer nerabha lapha, kodwa sizoxoxa ngalokho okwenza i-Viton ibe ekhethekile kangaka. Le nto ivame ukubonakala ngombala oluhlaza noma onsundu, kodwa okuyenza ihluke ngempela ubuningi bayo. Ubuningi be-Viton buphakeme kakhulu kunezinhlobo eziningi zerabha, okwenza i-Viton seal ibe ngeyodwa enamandla kakhulu.

I-Viton inobubanzi bokubekezelela amazinga okushisa kusukela ku--4F kuya ku-410F (-20C kuya ku-210C). Amazinga okushisa aphezulu i-Viton engawamelana nawo enza kube kuhle kakhulu ekusetshenzisweni kwamazinga okushisa aphezulu. I-Viton ivame ukusetshenziswa kuma-O-rings, amagilavu ​​​​angangeni makhemikhali kanye neminye imikhiqizo ebunjiwe noma ekhishwe ngaphandle. Ama-O-rings enziwe nge-Viton alungele ukuntywila nge-scuba, izinjini zezimoto kanye nama-valve ahlukahlukene.

Uma kukhulunywa ngokumelana namakhemikhali, i-Viton ayinakuqhathaniswa. Imelana nokugqwala okuvela ezinhlobonhlobo eziningi zoketshezi namakhemikhali kunanoma iyiphi i-elastomer engena-fluorinated. Ngokungafani ne-EPDM, i-Viton iyahambisana namafutha, amafutha, izinto zokugcoba kanye nama-asidi amaningi angaphili. Imelana kakhulu nokucindezelwa, ukushiswa komoya, ukukhanya kwelanga, isimo sezulu, amafutha emoto ane-oxygen, ama-aromatics, isikhunta, isikhunta, nokunye. Imelana kakhulu nokushiswa ngokwemvelo kunezinye irabha eziningi. Funda kabanzi mayelana nezinto okufanele zenziwe kanye nezinto okufanele zenziwe ngamakhemikhali e-Viton.

Inkinga enkulu nge-Viton yintengo yayo. Ekukhiqizeni, kubiza cishe izikhathi eziphindwe kasishiyagalombili ukukhiqiza inani elifanayo lezinto ezibonakalayo njenge-EPDM. Uma uthenga umkhiqizo oqukethe inani elincane lalezi zinto zerabha, intengo ingase ingashintshi kakhulu. Kodwa uma u-oda ngobuningi, ungalindela ukuthi izingxenye ze-Viton zibize kakhulu kune-EPDM.

Izimpawu ze-Viton neze-EPDM
Ishadi Lerabha Lokuvala I-Viton vs EPDM

Ngakho-ke iyiphi into engcono kakhulu? Le mibuzo ayilungile ngokuphelele. Zombili izinto zinezinhlelo zokusebenza ezithile lapho zilungele khona, ngakho konke kuncike emsebenzini abazowenza. I-C yethuAmavalvu Okuhlola Amabhola e-PVCkanye nama-CPVC Swing Check Valve atholakala ngezimbobo ze-Viton noma izimbobo ze-EPDM. Lezi zimbobo zenziwe ngama-O-rings afakwe ezingxeni. Lawa ma-valve aklanyelwe ukuhlukaniswa kalula ukuze kube lula ukuwalungisa, ukuze abe nemizimba esuswayo.

Uma udinga ivalvu yesistimu yamanzi, kungakhathaliseki ukuthi izinga lokushisa lingakanani, ivalvu ene-EPDM seal ivame ukuba yisinqumo esingcono kakhulu. Ngaphandle kokubekezelela izinga lokushisa okuhlukile kancane, umehluko omkhulu phakathi kwezinto ezimbili ukumelana kwazo namakhemikhali. I-Viton ilungele ukusetshenziswa nophethiloli nezinye izinto ezigqwalisayo, kodwa uma ubhekene nento engenangozi njengamanzi, lokhu kuqina okukhulu akudingeki.