Tepi yosindikizira ulusi

Thread seal tepi (yomwe imadziwikanso kuti PTFE tepi kapena plumber's tepi) ndi filimu ya polytetrafluoroethylene (PTFE) yogwiritsidwa ntchito posindikiza ulusi wa mapaipi. Tepiyo imagulitsidwa yodulidwa kuti ikhale m'lifupi mwake ndikumangirira pa spool, zomwe zimapangitsa kuti zikhale zosavuta kupota ulusi wa chitoliro. Amadziwikanso ndi tepi ya Teflon yopangidwa ndi genericized; pamene Teflon ndi yofanana ndi PTFE, Chemours (omwe ali ndi zizindikiro) amawona kuti kugwiritsa ntchito uku sikulakwa, makamaka chifukwa sakupanganso Teflon mu mawonekedwe a tepi. ulusi kuti asagwire pamene akumasulidwa.Tepiyo imagwiranso ntchito ngati chodzaza chopunduka ndi mafuta a ulusi, kuthandiza kusindikiza mgwirizano popanda kuumitsa kapena. zimapangitsa kuti zikhale zovuta kumangitsa, ndipo m'malo mwake zimakhala zosavuta kumangitsa.

Nthawi zambiri tepiyo imakulungidwa mozungulira ulusi wa chitoliro katatu isanayambe kukulungidwa. Amagwiritsidwa ntchito kwambiri pazamalonda kuphatikiza makina oponderezedwa amadzi, makina otenthetsera apakati, ndi zida zopondereza mpweya.

Mitundu

Tepi yosindikizira ulusi nthawi zambiri imagulitsidwa m'matumba ang'onoang'ono.
Pali miyeso iwiri yaku US yodziwira mtundu wa tepi iliyonse ya PTFE. MIL-T-27730A (zolemba zankhondo zakale zomwe zimagwiritsidwabe ntchito m'makampani ku US) zimafunikira makulidwe osachepera 3.5 mils komanso chiyero cha PTFE chochepera 99%. makulidwe ofunikira a MIL-T-27730A ndipo amawonjezera kachulukidwe kakang'ono ka 1.2 g/cm3. Miyezo yoyenera ingasiyane pakati pa mafakitale; tepi yopangira gasi (ku malamulo a gasi aku UK) imayenera kukhala yokulirapo kuposa yamadzi. Ngakhale PTFE yokha ndiyoyenera kugwiritsidwa ntchito ndi mpweya wothamanga kwambiri, kalasi ya tepi iyeneranso kudziwika kuti ilibe mafuta.

Tepi yosindikizira ya Thread yomwe imagwiritsidwa ntchito popanga mapaipi nthawi zambiri imakhala yoyera, koma imapezekanso mumitundu yosiyanasiyana. Nthawi zambiri amagwiritsidwa ntchito kuti agwirizane ndi mapaipi amtundu (US, Canada, Australia ndi New Zealand: chikasu cha gasi wachilengedwe, wobiriwira wa okosijeni, etc.). Mitundu yamitundu iyi ya tepi yosindikiza ulusi idayambitsidwa ndi Bill Bentley wa Unasco Pty Ltd mu 1970s. Ku UK, tepi imagwiritsidwa ntchito kuchokera ku ma reel achikuda, mwachitsanzo ma reel achikasu a gasi, obiriwira ngati madzi amchere.

Choyera - chogwiritsidwa ntchito pa ulusi wa NPT mpaka 3/8 inchi
Yellow - amagwiritsidwa ntchito pa ulusi wa NPT 1/2 inchi mpaka 2 inchi, nthawi zambiri amatchedwa "tepi ya gasi"
Pinki - yogwiritsidwa ntchito pa ulusi wa NPT 1/2 inchi mpaka 2 inchi, yotetezeka ku propane ndi mafuta ena a hydrocarbon
Green - yopanda mafuta PTFE yogwiritsidwa ntchito pamizere ya okosijeni ndi mpweya wina wamankhwala
Gray - ili ndi faifi tambala, anti-seizing, anti-gailling ndi anti-corrosion, yomwe imagwiritsidwa ntchito popanga mapaipi osapanga dzimbiri.
Copper - imakhala ndi ma granules amkuwa ndipo imatsimikiziridwa ngati mafuta opangira ulusi koma osati osindikiza
Ku Ulaya muyezo wa BSI BS-7786:2006 umatchula magiredi osiyanasiyana ndi miyezo yapamwamba ya tepi yosindikiza ulusi wa PTFE.