Rau cov ntsuas hluav taws xob electromagnetic flow meters, cov xwm txheej ua haujlwm twg yog qhov tsim nyog rau cov roj hmab hauv ob sab phlu, PTFE hauv ob sab phlu thiab PFA hauv ob sab phlu?

1. Roj Hmab (Ntuj/Neoprene/CR)
Qhov Zoo Tshaj Plaws rau: Lub hom phiaj dav dav, xeb tsawg mus rau nruab nrab, cov dej nruab nrab, thiab cov slurry nrog kev sib txhuam me me.
Kub: Feem ntau -10 ° C txog +80 ° C (kev mus ncig luv luv txog 90 ° C).
Kev xeb: Tiv taus dej tshiab, dej khib nyiab, dej hiav txwv, dej phwj tuaj, cov kua qaub/cov hauv paus tsis muaj zog (pH 4–10), thiab roj.
Kev puas tsuaj: Nruab nrab; tsim rau cov slurry me me, ntawv pulp, mine tailings (cov khoom khov tsawg).
Siab: Txog li PN16–PN25 (1.6–2.5 MPa).
Cov Kev Txwv: Tsis yog rau cov kua qaub muaj zog, cov hauv paus muaj zog, cov kuab tshuaj, lossis qhov kub siab; swells hauv hydrocarbons.
Kev Lag Luam: Dej/dej khib nyiab, hauv nroog, HVAC, txheej txheem dav dav, kev khawb av (kev puas tsuaj tsawg).
2. PTFE (Polytetrafluoroethylene, Teflon®)
Qhov Zoo Tshaj Plaws rau: Cov xov xwm corrosive heev, kub siab, thiab cov kua dej uas tsis abrasive.
Kub: -40 °C txog +130 °C (tus qauv); -200 °C txog +200 °C (qhov siab tshaj plaws, lub sijhawm txwv).
Kev xeb: Zoo heev—tiv taus cov kua qaub uas muaj concentrated (HCl, H₂SO₄, HNO₃), cov hauv paus muaj zog (NaOH, KOH), cov tshuaj oxidizers (NaClO, H₂O₂), thiab feem ntau cov kuab tshuaj organic.
Kev puas tsuaj: Tsis zoo - tsis txhob muaj cov khoom khov, xuab zeb, lossis cov khoom tawv.
Siab: Txog li PN25 (2.5 MPa); tsis yog rau lub tshuab nqus tsev/siab tsis zoo (kev pheej hmoo ntawm kev tawg).
Cov Kev Txwv: Brittle, tsis tshua muaj kev sib txhuam, tsis kam rau lub tshuab nqus tsev; tawm tsam los ntawm cov hlau alkali molten, roj fluorine, ClF₃.
Kev Lag Luam: Kev ua tshuaj lom neeg, petrochemical, tshuaj, plating, dej khib nyiab (corrosive heev).
3. PFA (Perfluoroalkoxy, "PTFE hloov kho")
Zoo tshaj plaws rau: Kev ua kom huv siab, kub siab, thiab cov ntawv thov corrosive heev (txhim kho dua PTFE).
Kub: -40 ° C txog +180 ° C (txuas ntxiv); luv luv mus txog 200 ° C.
Kev xeb: Sib npaug rau PTFE—tiv taus txhua yam xov xwm sib xws nrog PTFE; ultra-low metal ion leaching (<1 ppb).
Kev puas tsuaj: Zoo dua li PTFE (tseem nruab nrab); tsim nyog rau cov khoom khov qis mus rau nruab nrab.
Siab: Txog li PN40 (4.0 MPa); tiv taus lub tshuab nqus tsev / siab tsis zoo zoo heev.
Mechanical: Yoog tau yooj ywm, tawv, tiv taus kev nkag; tuaj yeem sib txuas nrog lub raj los ntawm cua sov (tsis muaj kev tawg); muaj kev xaiv pob tshab/pob tshab.
Kev Ua Raws Cai: FDA, 3‑A, EHEDG, ASME BPE (cov qauv kev huv/kev dawb huv siab).
Cov Kev Txwv: Tus nqi siab dua (3–5 × PTFE); tib yam kev zam tshuaj lom neeg li PTFE.
Kev Lag Luam: Semiconductor (dej ntshiab heev/tshuaj lom neeg), biotech/tshuaj (sterile/CIP/SIP), khoom noj/dej haus (sanitization kub heev), hnub ci, thiab cov txheej txheem tshuaj lom neeg siab heev.