ʻOiai e like paha ia me kahi kikoʻī liʻiliʻi, he mea koʻikoʻi ka mea O-ring o ka valve. Hiki i ka mea ke hoʻoholo i ka hoʻomanawanui wela o ka sila. Hāʻawi pū ia i ke sila i ke kūpaʻa kemika, a ua kūpono kekahi ʻano o ka lāʻau me nā wai like ʻole. ʻElua mau mea maʻamau no nā kiwi pōpō hui maoli ʻo Viton a me EPDM.

ʻO Viton (kiʻi ʻia ma ka ʻaoʻao ʻākau) he lāʻau synthetic me ke kiʻekiʻe kemika a me ka pale wela. ʻO EPDM ke kū nei no ka Ethylene Propylene Diene Monomer a loaʻa iā ia kāna mau waiwai ponoʻī e lilo ia i mea kaulana loa O-ring. I ka hoʻohālikelike ʻana iā Viton me EPDM, pono e noʻonoʻo ʻia kekahi mau mea: ka ʻae ʻana i ka mahana, ka hoʻohālikelike ʻana i nā kemika, a me ke kumukūʻai. E heluhelu no ka hoʻohālikelike piha.

EPDM sila hili
EPDM rubber (EPDM lāʻau) he lāʻau paʻakikī a kūʻai ʻole me ka nui o ka hoʻohana ʻana. Hoʻohana maʻamau ia no ka pale ʻana i ka hale no ka mea e hoʻopaʻa maikaʻi ʻia ʻo EPDM. He mea maʻamau nō hoʻi ia no nā sila paʻukū no ka mea he insulator a maikaʻi loa ke kūpaʻa haʻahaʻa haʻahaʻa. Ma ke ʻano kikoʻī, hana maikaʻi ʻo EPDM i ka pae wela o -49F a 293F (-45C a i 145C), i mea kūpono no nā noi i kēlā me kēia wela.

ʻOiai ʻo ka nui o nā lāʻau lapaʻau he pale wela kiʻekiʻe, he kakaikahi wale nō ka mea hiki ke mālama i nā wela haʻahaʻa e like me EPDM. ʻO ia ka mea i koho mua ʻia no ka poʻe e hoʻāʻo nei e sila i nā wahi anu a i ʻole me nā mea anuanu. ʻOiaʻiʻo Union Ball Valves meEPDM i hoʻopaʻa ʻia i nā O-RingsʻO nā noi maʻamau no ka EPDM e pili ana i ka hoʻokaʻawale uila, nā linings pool, plumbing, nā mea hōʻiliʻili solar panels, O-rings, a me nā mea hou aku.

Ma waho aʻe o ka hoʻomanawanui ʻana o ka wela, loaʻa i ka EPDM kahi pale kemika ākea. Hoʻopili kēia i ka wai wela, ka mahu, nā mea hoʻomaʻemaʻe, nā mea hoʻonā potash caustic, sodium hydroxide solutions, silicone oil/grease, a me nā ʻakika a me nā kemika ʻē aʻe. ʻAʻole kūpono ia no ka hoʻohana ʻana me nā huahana aila mineral e like me nā aila lubricating, nā aila a i ʻole nā ​​​​huahana. No ka hoʻohālikelike kemika kūikawā o EPDM, kaomi ma aneʻi. ʻO kēia mau waiwai kupanaha, i hui pū ʻia me kāna kumu kūʻai haʻahaʻa, e hana ʻo EPDM i mea hoʻopaʻa inoa kaulana loa.

Sila Viton
ʻO ka Viton kahi lāʻau synthetic a me ka elastomer fluoropolymer. 'O ka "Fluoropolymer" 'o ia ho'i ke kū'ē ki'eki'e o kēia mea i nā solvents, acids a me nā kumu. Hiki ke hoʻololi ʻia ka huaʻōlelo "elastomer" me ka "rubber". ʻAʻole mākou e kūkākūkā i ka ʻokoʻa ma waena o ka elastomer a me ka rubber ma aneʻi, akā e kūkākūkā mākou i ke ʻano o Viton. Hōʻike pinepine ʻia ka mea i ka ʻōmaʻomaʻo a ʻeleʻele paha, akā ʻo ka mea e hoʻokaʻawale maoli ai ʻo ia ka nui. ʻOi aku ka kiʻekiʻe o Viton ma mua o ka hapa nui o nā ʻano lāʻau lapaʻau, e hana ana i ka sila Viton kekahi o nā mea ikaika loa.

Loaʻa i ka Viton kahi ākea ākea wela mai -4F a 410F (-20C a 210C). ʻO nā wela kiʻekiʻe i hiki iā Viton ke kū i mea kūpono no nā noi wela kiʻekiʻe. Hoʻohana pinepine ʻia ʻo Viton i nā apo-O, nā mīkina lima kūpaʻa kemika a me nā huahana ʻē aʻe i hoʻoheheʻe ʻia a extruded paha. ʻO nā apo i hana ʻia mai Viton he mea maikaʻi loa ia no ka luʻu scuba, nā ʻenekini kaʻa a me nā kiwi like ʻole.

I ka hiki ʻana mai i ke kūʻē kemika, ʻaʻole kūlike ʻo Viton. Ke pale nei ia i ka ʻino mai nā ʻano wai like ʻole a me nā kemika ma mua o nā elastomer non-fluorinated. ʻAʻole like me EPDM, kūpono ʻo Viton me nā aila, nā wahie, nā lubricants a me ka hapa nui o nā waikawa inorganic. He kūpaʻa loa ia i ka hoʻopaʻa ʻana, ka hoʻoheheʻe ʻana i ka lewa, ka lā, ka wā, nā wahie kaʻa oxygenated, nā mea ʻala, nā fungi, ka ʻōpala, a me nā mea hou aku. ʻOi aku ka ʻoi aku o ke kūpaʻa ʻana i ke ahi ma mua o ka nui o nā rubbers ʻē aʻe. E heluhelu hou aʻe e pili ana i nā mea pono a me nā pono o nā kemika Viton.

ʻO ka pilikia nui me ka Viton kona kumukūʻai. I ka hana ʻana, ʻoi aku ka nui o 8 mau manawa no ka hana ʻana i ka nui o nā mea like me EPDM. Ke kūʻai ʻana i kahi huahana i loaʻa i kahi mea liʻiliʻi wale nō o kēia mau mea lāʻau lapaʻau, ʻaʻole paha e loli nui ke kumukūʻai. Akā i ke kauoha ʻana i nā mea nui, hiki iā ʻoe ke manaʻo e ʻoi aku ke kumukūʻai o nā ʻāpana Viton ma mua o ka EPDM.

Viton a me EPDM sila
Viton vs EPDM Sealing Rubber Chart

No laila ʻo wai ka mea ʻoi aku ka maikaʻi? ʻAʻole pololei kēia mau nīnau. Loaʻa i nā mea ʻelua nā noi kikoʻī kahi e maikaʻi ai lākou, no laila pili ia i ka hana a lākou e hana ai. ʻO kā mākou CʻO nā pahu hoʻopaʻa kinipōpō PVCa me CPVC Swing Check Valves me nā sila Viton a i ʻole nā ​​sila EPDM. Hana ʻia kēia mau sila i nā O-rings i hoʻokomo ʻia i nā mea pono. Hoʻolālā ʻia kēia mau valves e wehe maʻalahi no ka mālama maʻalahi, no laila he mau kino hiki ke wehe ʻia.

Inā makemake ʻoe i ka valve no kahi ʻōnaehana wai, me ka nānā ʻole i ka mahana, ʻo ka valve me kahi sila EPDM ka mea maʻamau ke koho maikaʻi loa. Ma waho aʻe o nā ʻokoʻa wela ʻokoʻa, ʻo ka ʻokoʻa nui ma waena o nā mea ʻelua ʻo ko lākou kūpaʻa kemika. He mea maikaʻi ʻo Viton no ka hoʻohana ʻana me ka wahie a me nā mea corrosive ʻē aʻe, akā i ka wā e pili ana i kahi mea ʻino ʻole e like me ka wai, ʻaʻole pono kēia paʻa loa.