Zisindikizo za mavavu: Kodi mungasiyanitse bwanji ndikusankha mipando ya mavavu ya PTFE, EPDM, ndi PFA?

1: Kodi kusiyana kwakukulu pakati pa zipangizo za PTFE, EPDM ndi PFA ndi kotani?

PTFE (Polytetrafluoroethylene):Yodziwika bwino kuti ndi mfumu ya pulasitiki, ndi yoyera yolimba yokhala ndi mankhwala osagwira ntchito bwino komanso yolimba kutentha (-196℃ ~ + 200℃). Ili ndi mphamvu yochepa kwambiri yolimbana ndi kukangana, koma kapangidwe kake ndi kofewa ndipo sikovuta kuwononga komanso kupanikizika kwambiri.

EPDM (ethylene propylene diene monomer):Rabala yakuda yosalala. Ubwino waukulu ndi kukana bwino madzi otentha, nthunzi, asidi ndi alkali (asidi wofooka ndi alkali wofooka) komanso kukana nyengo. Vuto lake ndilakuti sililimbana ndi mafuta amchere ndi zosungunulira za hydrocarbon.

PFA (utomoni wa perfluoroalkoxy):PTFE yosinthidwa yosinthika yomwe imatha kusungunuka. Kagwiridwe kake ka ntchito kamafanana ndi PTFE, koma kukana kwake kutentha kwambiri ndi kwakukulu (+260°C), ndipo imatha kupangidwa kukhala mpando wokhuthala wa valavu wokhala ndi malo osalala kudzera mu jekeseni. Kukana kwake kukwera ndi kukana kusweka ndikwabwino kuposa PTFE.

2: Ponena za kugwirizana kwa zinthu zoulutsira mawu, ndi madzi ati omwe ali oyenera?

PTFE: Imagwiritsidwa ntchito pafupifupi pa asidi onse amphamvu, maziko olimba, ndi zosungunulira zachilengedwe, koma si yoyenera pa zitsulo zosungunuka za alkali ndi mpweya wa fluorine wotentha kwambiri.

EPDM:Ndi yoyenera kwambiri pamadzi otentha, nthunzi, mafuta a hydraulic a phosphate ester, brake fluid, ma asidi ofooka ndi ma bases. Ndikoletsedwa kugwiritsa ntchito mafuta opangidwa ndi mafuta (mafuta, dizilo), toluene, ndi ma acid okhuthala.

PFA:Ili ndi kukana dzimbiri kwa PTFE ndipo imakhala yolimba kwambiri ikatentha kwambiri komanso ikapanikizika. Ndi yoyenera kwambiri mankhwala oyera kwambiri (monga sulfuric acid yoyera kwambiri ndi nitric acid yomwe imagwiritsidwa ntchito mumakampani opanga ma semiconductor).

3: Kodi mungasankhe bwanji pakati pa zinthu zitatuzi pankhani ya makhalidwe enieni?

Kusindikiza:EPDM > PTFE ≈ PFA. Rabala ili ndi mphamvu yolimba yosinthasintha komanso yolekerera kwambiri mikwingwirima pamwamba pa mpando wa valavu; PTFE/PFA imafuna mphamvu yayikulu yotsekera koyamba.

Kukana kutentha: PFA (+260℃) > PTFE (+200℃) > EPDM (nthawi zambiri +120℃, fomula yapadera +150℃).

Kukana kuvala:PFA > PTFE > EPDM. Zipangizo zokhala ndi tinthu tating'onoting'ono zidzavala mpando wa valavu ya EPDM mwachangu, zomwe zimapangitsa kuti chosinthiracho chizimitse.

Zofunikira pa torque:PTFE/PFA ili ndi mphamvu yochepa yolimbana ndi mpweya komanso mphamvu yaying'ono yosinthira mpweya. EPDM ili ndi mphamvu yayikulu yolimbana ndi mpweya, zomwe zimapangitsa kuti kutsegula ndi kutseka valavu kukhale kovuta kwambiri.

4: Kodi mungapange bwanji zisankho mwachangu potengera momwe ntchito ikuyendera?

Gawo 1:Onani ngati chosungiracho chili ndi mafuta. Ngati ndi mafuta amchere kapena mafuta amafuta, sankhani EPDM ndikusankha PTFE kapena PFA.

Gawo 2:Yang'anani kutentha kwapakati ndi ukhondo. Pa kutentha kwambiri (>150°C) kapena mpweya wolowa madzi kwambiri (monga chlorine), PFA ndi yabwino kwambiri. Ngati kutentha sikuli kokwera (<120℃) ndipo ndi madzi, nthunzi kapena mpweya, EPDM ndiye chisankho chotsika mtengo kwambiri.

Gawo 3:Yang'anani ngati pali tinthu tating'onoting'ono kapena kusinthana pafupipafupi. Ngati imasinthidwa pafupipafupi kapena ili ndi tinthu tating'onoting'ono tolimba, sankhani PFA. Kudula kamodzi kokha ndipo palibe tinthu tating'onoting'ono, PTFE yosankha.

5: Kodi pali zinthu "zonse"?

Ayi. Ngati mukufuna kupirira kutentha kwambiri, dzimbiri lamphamvu komanso mafuta nthawi imodzi, PFA ndiye chisankho choyamba, koma ndi yokwera mtengo (pafupifupi nthawi 3-5 kuposa PTFE) ndipo magwiridwe ake otsekera si abwino ngati rabara. Ngati sing'angayo sigwiritsa ntchito mafuta ndipo kutentha sikuli kokwera, EPDM ndiye yotsika mtengo kwambiri. Chosankha chachikulu chosungira ndi PTFE.

6: Chidule

Kusankha zinthu zoyenera zotsekera kungapangitse kuti nthawi yogwira ntchito ya valavu iwonjezere kawiri.Malingaliro a kampani Tianjin Tanggu Water-Seal Valve Co., Ltd- imagwira ntchito yopangira zinthumavavu a gulugufe, mavavu a chipatandima valve owunikirandipo ali ndi luso lotha kusintha zinthu zotsekera monga PTFE, EPDM, ndi PFA. Sitipanga ma valve "onse", koma tadzipereka kupereka njira yolimba komanso yotsika mtengo yotsekera mapaipi anu onse. Ngati muli ndi mafunso okhudza kusankha,TWSGulu la akatswiri lakonzeka kufufuza bwino kugunda kwa mtima wanu.