Nā sila Valve: Pehea e hoʻokaʻawale ai a koho i nā noho valve PTFE, EPDM, a me PFA?

1: He aha ka ʻokoʻa koʻikoʻi ma waena o nā mea PTFE, EPDM a me PFA?

PTFE (Polytetrafluoroethylene):ʻIke nui ʻia ʻo ia ke aliʻi o nā palakiko, he mea paʻa keʻokeʻo me ka inertness kemika maikaʻi loa a me ke kūpaʻa wela (-196℃~+200℃). He haʻahaʻa loa kona coefficient friction, akā palupalu kona ʻano a ʻaʻole kūpaʻa i ka ʻaʻahu a me ke kaomi kiʻekiʻe.

ʻO ka EPDM (ethylene propylene diene monomer):ʻEleʻele elastic rubber. ʻO ka pono nui ka pale maikaʻi loa i ka wai wela, ka mahu, ka waikawa a me ka alkali (ka waikawa nāwaliwali a me ka alkali nāwaliwali) a me ke kūpaʻa ʻana i ka wā. ʻO ka hemahema, ʻaʻole ia e kūpaʻa i ka ʻaila mineral a me nā mea hoʻoheheʻe hydrocarbon.

PFA (perfluoroalkoxy resin):PTFE i hoʻololi ʻia hiki ke hoʻoheheʻe ʻia. Ua like kona hana me PTFE, akā ʻoi aku ke kiʻekiʻe o kona kūpaʻa ʻana i nā mahana kiʻekiʻe (+260°C), a hiki ke hana ʻia i kahi noho valve ʻoi aku ka mānoanoa me kahi ʻili laumania ma o ka hoʻoheheʻe ʻana i ka injection. ʻOi aku ka maikaʻi o kona kūpaʻa kolo a me ke kūpaʻa nahā ma mua o PTFE.

2: Ma ke ʻano o ka launa pū ʻana me nā pāpāho, he aha nā wai kūpono iā lākou?

PTFE: Pili i ka aneane o nā waikawa ikaika a pau, nā kumu ikaika, a me nā mea hoʻoheheʻe organik, akā ʻaʻole kūpono no nā metala alkali i hoʻoheheʻe ʻia a me ke kinoea fluorine wela kiʻekiʻe.

EPDM:He kūpono loa no ka wai wela, ka mahu, ka ʻaila hydraulic phosphate ester, ka wai hoʻōki, nā waikawa nāwaliwali a me nā kumu. Ua kapu loa ʻia ka hoʻohana ʻana i nā ʻaila petroleum (gasoline, diesel), toluene, a me nā waikawa i hoʻohuihui ʻia.

PFA:Loaʻa iā ia nā pale ʻino a pau o ka PTFE a ʻoi aku ka paʻa ma lalo o ke kiʻekiʻe o ka mahana a me ke kaomi. He kūpono loa ia no nā kemika ultra-pure (e like me ka waikawa sulfuric kiʻekiʻe a me ka waikawa nitric i hoʻohana ʻia i ka ʻoihana semiconductor).

3: Pehea e koho ai ma waena o nā mea ʻekolu e pili ana i nā waiwai kino?

Sila ʻana:EPDM > PTFE ≈ PFA. Loaʻa i ka laholio ka hiki ke hoʻololi elastic ikaika a me ke ahonui kiʻekiʻe no nā ʻōpala ma ka ʻili noho valve; Pono ka PTFE/PFA i kahi kaomi kikoʻī sila mua nui aʻe.

Ke kū'ē ʻana i ka mahana: PFA (+260℃) > PTFE (+200℃) > EPDM (maʻamau +120℃, ʻano kūikawā +150℃).

Ke kū'ē ʻana i ke komo ʻana:PFA > PTFE > EPDM. E hoʻopau koke nā mea i loaʻa nā ʻāpana i ka noho kiwikā EPDM, e hoʻopaʻa ai i ke kuapo.

Nā koi Torque:He haʻahaʻa ka coefficient friction o ka PTFE/PFA a he liʻiliʻi ka torque switching. He nui ka coefficient friction o ka EPDM, e ʻoi aku ka paʻakikī o ka wehe ʻana a me ka pani ʻana i ka valve.

4: Pehea e hana koke ai i nā hoʻoholo koho e pili ana i nā kūlana hana?

KaʻAnuʻu Hana 1:E nānā inā loaʻa ka ʻaila i loko o ka mea hana. Inā he ʻaila mineral a he ʻaila wahie paha, e kāpae i ka EPDM a koho i ka PTFE a i ʻole PFA.

KaʻAnuʻu Hana 2:E nānā i ka mahana waena a me ka maʻemaʻe. No nā mahana kiʻekiʻe (>150°C) a i ʻole nā ​​​​kinoea permeable kiʻekiʻe (e like me ka chlorine), makemake ʻia ka PFA. Inā ʻaʻole kiʻekiʻe ka mahana (<120℃) a he wai, mahu a ea paha, ʻo EPDM ke koho kūpono loa.

KaʻAnuʻu Hana 3:E nānā inā he mau ʻāpana a i ʻole ke kuapo pinepine ʻana. Inā hoʻoponopono pinepine ʻia a i ʻole he mau ʻāpana paʻakikī, koho i ka PFA. ʻOki hoʻokahi manawa a ʻaʻohe ʻāpana, koho PTFE.

5: Aia kekahi mea "ao holoʻokoʻa"?

ʻAʻole. Inā pono ʻoe e kūpaʻa i nā mahana kiʻekiʻe, ka pala ikaika a me ka ʻaila i ka manawa like, ʻo PFA ke koho mua, akā he pipiʻi ia (ma kahi o 3-5 mau manawa o ka PTFE) a ʻaʻole maikaʻi kāna hana sila e like me ka laholio. Inā ʻaʻole hoʻokomo ka medium i ka ʻaila a ʻaʻole kiʻekiʻe ka mahana, ʻo EPDM ka mea hoʻokele waiwai loa. ʻO ke koho conservative maʻamau ʻo PTFE.

6: Hōʻuluʻulu Manaʻo

ʻO ke koho ʻana i ka mea sila kūpono hiki ke pāpālua i ke ola o ka valve.ʻO Tianjin Tanggu Wai-Seal Valve Co., Ltd- loea i ka hana ʻana onā kiwikā pepeke, nā kiwikā puka, a menā kiwikā nānā, a he akamai i ka hoʻololi ʻana i ke kūlana hana o nā mea sila e like me PTFE, EPDM, a me PFA. ʻAʻole mākou e hana i nā valves "honua", akā ua kūpaʻa mākou i ka hāʻawi ʻana i ke ʻano sila paʻa loa a me ka hoʻokele waiwai no kēlā me kēia o kāu mau pipeline. Inā he mau nīnau kāu e pili ana i ke koho ʻana,TWSUa mākaukau ka hui loea e nānā pololei i kou pulse.