Muaj ntau yam khoom siv rau lub cev valve, haum rau ntau yam kev ua haujlwm
Cov khoom siv feem ntau siv rau lub cev valve yog raws li hauv qab no:
1. Grey cam khwb cia hlau, haum rau cov qis-siab li qub nrog kev ua haujlwm kub ntawm -15 ~ +200 degree thiab nominal siab PN Tsawg dua lossis sib npaug rau 1.6MPa.
2. Lub plawv dub malleable cam khwb cia hlau yog tsim rau nruab nrab thiab tsis tshua muaj siab li qub nrog kev ua haujlwm kub ntawm -15 ~ +250 degree thiab nominal siab PN Tsawg dua lossis sib npaug li 2.5MPa.
3. Cov khoom siv hlau, haum rau nruab nrab thiab tsis tshua muaj siab li qub nrog kev ua haujlwm kub ntawm -30 ~ +350 degree thiab nominal siab PN Tsawg dua lossis sib npaug rau 4.0MPa.
4. Carbon steel (WCA, WCB, WCC) yog tsim rau nruab nrab thiab siab siab li qub nrog kev ua haujlwm kub ntawm -29 thiab +425 degree, ntawm 16Mn thiab 30Mn muaj qhov ua haujlwm kub ntawm -40 thiab +450 degree thiab feem ntau siv rau Hloov ASTM A105.
5. Tsawg-kub carbon steel (LCB), haum rau qis-kub li qub nrog kev khiav hauj lwm kub ntawm -46 thiab +345 degree .
6. Alloy steel (WC6, WC9), haum rau qhov kub thiab txias li qub uas tsis yog-corrosive nruab nrab nrog kev ua haujlwm kub ntawm -29 ~ +595 degree ; WC5 thiab WC12 yog tsim rau li qub nrog kev ua haujlwm kub ntawm -29 ~ +650 degree Siab kub thiab siab siab li qub rau cov xov xwm corrosive.
7. Austenitic stainless hlau, haum rau li qub nrog corrosive media uas nws ua haujlwm kub ntawm -196 ~ +600 degree .
8. Monel alloy feem ntau haum rau cov li qub uas muaj hydrofluoric nruab nrab.
9. Cam khwb cia tooj liab alloy, feem ntau haum rau li qub rau cov kav dej pa oxygen nrog kev ua haujlwm kub ntawm -273 ~ +200 degree . tus
Cov npe saum toj no yog cov pawg loj ntawm cov khoom siv feem ntau rau lub cev valve. Tshwj xeeb, txhua hom khoom muaj ntau qib sib txawv, thiab ntau qib yog haum rau ntau qib siab. Yog li ntawd, thaum xaiv lub valve lub cev cov khoom ntawm lub valve, lub valve lub cev cov khoom tsim nyog rau kev ua hauj lwm tej yam kev mob yuav tsum tau txiav txim siab raws li kev siv sib txawv thiab txawv theem.
Tsis tas li ntawd, cov khoom siv lub cev muaj xws li titanium alloy (titanium valve), aluminium alloy (aluminium valve); yas (plastic valve); ceramics (ceramic valve) thiab lwm yam.
Cov txheej txheem kev kho cua sov ntawm lub valve lub cev yog raws li nram no raws li cov ntaub ntawv sib txawv
1. Kev kho cua sov ntawm grey cam khwb cia hlau.
Txhawm rau kom ua tiav cov hom phiaj sib txawv, cov hlau cam grey tuaj yeem raug kev kho cua sov sib txawv tom qab casting. Hauv kev tsim cov li qub, cov txheej txheem kev kho cua sov feem ntau siv rau qhov chaw xws li grey cam khwb cia hlau valve lub cev tom qab casting muaj xws li: thermal aging kom tshem tawm cov kev ntxhov siab casting thiab kub annealing kom tshem tawm cov cementite dawb. Thermal aging yog ib txoj kev tsim nyog. Kub kub annealing tsuas yog siv los hloov thermal aging thaum muaj thawj cementite nyob rau hauv cov qauv tom qab casting vim kev tswj tsis raug ntawm cov tshuaj muaj pes tsawg leeg thiab casting txias npaum li cas thaum lub sij hawm casting.
2. Kev kho cua sov ntawm carbon cam khwb cia hlau.
Cov hlau castings muaj kev ntxhov siab loj loj tom qab casting, thiab qee zaum cov qauv ntawm cov hlau castings yog ntxhib, thiab txawm tias cov qauv overheated tshwm. Tag nrho cov no cuam tshuam rau qhov kev ruaj ntseg ntawm cov hlau castings, txo cov khoom siv hluav taws xob ntawm cov hlau thiab tsis ua rau cov txheej txheem txiav. Txhawm rau tshem tawm kev ntxhov siab, ua kom zoo dua qub, txhim kho cov khoom siv thiab txhim kho kev ua haujlwm, thiab lwm yam, carbon steel valve lub cev thiab lwm yam feem ntau yog annealed lossis normalized + tempered tom qab casting hauv valve ntau lawm.
3. Kev kho cua sov ntawm austenitic stainless thiab acid-resistant steel.
Lub ntsiab tsis xws luag ntawm austenitic stainless thiab acid-resistant steel yog hais tias nws yog nquag mus rau intergranular corrosion. Feem ntau, qee qhov kev tiv thaiv tuaj yeem ua tau los ntawm kev siv qee yam kev kho cua sov rau cov hlau. Hauv kev tsim cov li qub, cov txheej txheem kho cua sov feem ntau siv rau qhov chaw xws li austenitic stainless acid-resistant steel valve lub cev yog: kev kho tshuaj (quenching), stabilization kev kho mob thiab kev kho cryogenic.
4. Kev kho cua sov ntawm martensitic tshav kub-resistant steel.
Lub martensitic tshav kub-resistant steel yuav tsum tau annealed nyob rau hauv lub sij hawm tom qab casting los tiv thaiv kab nrib pleb, thiab lub annealing thiab tuav lub sij hawm yuav tsum txaus (feem ntau 4 mus rau 8 teev). Lub hom phiaj ntawm annealing martensitic tshav kub-resistant steel yog tshem tawm kev ntxhov siab, recrystallize, refine nplej, txo hardness, txhim kho kev ua tau zoo, thiab npaj rau kev kho cua sov zaum kawg.
Kev kho cua sov kawg ntawm martensitic tshav kub-resistant steel txais yuav normalizing + tempering kho.
5. Kev kho cua sov ntawm carbon steel.
Kev kho cua sov ntawm carbon steel siv No. 35 forged steel valve lub cev ua piv txwv. Tom qab forging, No. 35 steel valve lub cev yuav tsum tau normalized, thiab nws qhov kawg kev kho cua sov yuav tsum tau ua raws li cov kev cai ntawm lub valve manufacturing cov ntaub ntawv, thiab feem ntau nws yuav tsum tau quenched thiab tempered.