Pob Valve Rooj Cov Khoom Siv: Yuav Xaiv Li Cas
Cov khoom siv pob valve lub rooj zaum feem ntau yog categorized lihlauthiabtsis yog-hlau. Kev xaiv yog ua raws li kev xav ntawm kev tshaj tawm cov yam ntxwv, kub, siab thiab corrosion kuj. Lub rooj zaum txiav txim siab kaw kev ua haujlwm, kev pabcuam lub neej thiab lub hnab ntawv ua haujlwm ntawm lub valve.
1. Cov khoom siv rooj zaum hlau
Stainless hlau (304/316L):
resistant rau me me corrosive media thiab kub txog li 400 degree; suits dej, chav dej thiab cov kua tshuaj lom neeg.
Nickel{0}}raws li alloys:
tiv taus corrosive media xws li hydrofluoric acid thiab siab -kub hydrogen fluoride.
Duplex stainless hlau (S31803, S32750):
austenitic-ferritic qauv tiv thaiv chloride kev nyuaj siab corrosion hauv acidic, chloride-muaj ib puag ncig.
Cemented carbide:
hardness Ntau tshaj los yog sib npaug rau 85 HRA, kub tsis kam siab tshaj 550 degree, siab -siab sealing stability (Ntau tshaj los yog sib npaug rau 42 MPa) - rau cov thee chemical thiab roj thiab roj kev pab cuam nrog cov khoom hais.
2. Tsis yog -Cov khoom siv hlau
| Khoom siv | Kub | Nta | Daim ntawv thov |
|---|---|---|---|
| PTFE | -196 rau 260 degree | Chemical inertness, tsis tshua muaj kev sib txhuam (0.02-0.04), ua rau txias txaus | Cov tshuaj corrosive, qis -kub media |
| Txhawb PTFE | -100 txog 100 degree | iav / graphite ntim rau compressive zog | Nruab nrab / qis - lub pob valve |
| PEB | -70 rau 260 degree | High zog tuav, chav thiab hydrocarbon kuj | Siab - siab roj av valve rooj zaum |
| EPDM | -28 rau 120 degree | Ozone thiab phosphate -ester resistant | HVAC, kev kho dej |
3. Qhov taw qhia xaiv qhov tseem ceeb
Kub:
hlau rooj> PEEK> PTFE> roj hmab (carbide rau 550 degree; PTFE txwv rau 260 degree).
Corrosion:
muaj zog acids/alkalis → PTFE los yog npib tsib xee alloys; chlorine media → duplex lossis npib tsib xee-raws li alloys.
Hnav:
carbide los yog polyurethane composites muab 3-5x lub neej ntev nrog slurry los yog catalyst hais.
Cov lus nug nquag
Dab tsi yog cov khoom siv lub rooj zaum zoo tshaj plaws rau kev kub siab?
Cov rooj zaum hlau - tshwj xeeb yog cemented carbide (siab dua 550 degree) thiab stainless hlau (txog 400℃).
Thaum twg PTFE lub rooj yuav tsum siv?
Rau cov tshuaj corrosive thiab qis - qhov kub thiab txias kev pab cuam qhov twg chemical inertness tseem ceeb tshaj li txhua yam muaj zog.
Dab tsi txwv PTFE rooj zaum?
Cold flow (creep) deformation nyob rau hauv load, uas tuaj yeem ua rau cov dej xau hauv siab - kev pabcuam siab.
Cov rooj zaum hlau puas zoo dua li cov rooj zaum mos?
Tsis tas li. Cov rooj zaum mos muab npuas- kaw nruj thiab txo tus nqi; hlau rooj yeej ntawm qhov kub thiab txias, yaig thiab kev nyab xeeb hluav taws.
Lub rooj zaum twg tiv taus slurry yaig?
Cemented carbide los yog polyurethane composites, uas xa 3-5x lub neej ntev nrog cov khoom siv.
