Cov khoom siv ntawm qhov tseem ceeb ntawm lub valve yuav tsum xub xav txog cov khoom siv lub cev (kub, siab) thiab tshuaj lom neeg (corrosivity) ntawm qhov nruab nrab ua haujlwm.Nyob rau tib lub sijhawm, nws kuj tseem yuav tsum paub qhov kev huv ntawm qhov nruab nrab (txawm tias muaj cov khoom sib xyaw).Tsis tas li ntawd, cov kev cai thiab cov kev cai ntawm lub xeev thiab cov neeg siv department yuav tsum raug xa mus rau.
Ntau yam khoom siv tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov khoom siv li qub nyob rau hauv ntau yam kev ua haujlwm.Txawm li cas los xij, qhov kev pabcuam nyiaj txiag tshaj plaws thiab kev ua haujlwm zoo tshaj plaws ntawm lub valve tuaj yeem tau txais los ntawm kev xaiv kom raug thiab tsim nyog ntawm cov khoom siv valve.
Cov khoom siv ntawm lub cev valve
1. Grey cam khwb cia hlau li qub tau siv dav hauv ntau qhov chaw ntawm kev lag luam vim tias lawv cov nqi qis thiab kev siv dav dav.Lawv feem ntau yog siv nyob rau hauv cov ntaub ntawv ntawm dej, chav, roj thiab roj raws li qhov nruab nrab, thiab yog dav siv nyob rau hauv tshuaj lom neeg kev lag luam, luam ntawv thiab dyeing, oiling, textile thiab ntau lwm yam khoom lag luam uas muaj me me los yog tsis muaj kev cuam tshuam rau hlau muaj kuab paug.
Nws muaj feem xyuam rau qhov tsis tshua muaj siab li qub nrog kev ua haujlwm kub ntawm - 15 ~ 200 ℃ thiab nominal siab ntawm PN ≤ 1.6MPa.
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2. Dub core malleable hlau yog siv tau rau nruab nrab thiab tsis tshua muaj siab li qub nrog kev ua haujlwm kub ntawm - 15 ~ 300 ℃ thiab nominal siab PN ≤ 2.5MPa.
Cov xov xwm siv tau yog dej, dej hiav txwv, roj, ammonia, thiab lwm yam.
3. Nodular cam khwb cia hlau Nodular cam khwb cia hlau yog ib hom cam khwb cia hlau, uas yog ib hom cam khwb cia hlau.Lub flake graphite nyob rau hauv grey cam khwb cia hlau yog hloov los ntawm nodular graphite los yog globular graphite.Kev hloov ntawm cov qauv sab hauv ntawm cov hlau no ua rau nws cov khoom siv kho tshuab zoo dua li cov grey cam khwb cia hlau zoo tib yam, thiab tsis ua rau lwm yam khoom puas tsuaj.Yog li ntawd, li qub ua los ntawm cov hlau nplaum muaj kev pabcuam siab dua li cov uas ua los ntawm cov hlau grey.Nws muaj feem xyuam rau nruab nrab thiab tsis tshua muaj siab li qub nrog kev ua haujlwm kub ntawm - 30 ~ 350 ℃ thiab nominal siab ntawm PN ≤ 4.0MPa.
Qhov nruab nrab siv tau yog dej, dej hiav txwv, chav, cua, roj, roj, thiab lwm yam.
4. Carbon steel (WCA, WCB, WCC) pib tsim cam khwb cia hlau kom tau raws li cov kev xav tau ntawm cov uas dhau lub peev xwm ntawm cam khwb cia hlau li qub thiab bronze li qub.Txawm li cas los xij, vim qhov kev pabcuam zoo ntawm cov pa roj carbon steel li qub thiab lawv cov kev tiv thaiv muaj zog rau kev ntxhov siab los ntawm thermal expansion, cuam tshuam kev thauj khoom thiab cov kav dej deformation, lawv qhov kev siv tau nthuav dav, feem ntau suav nrog kev ua haujlwm ntawm cam khwb cia hlau li qub thiab bronze li qub.
Nws muaj feem xyuam rau nruab nrab thiab siab siab li qub nrog kev ua haujlwm kub ntawm - 29 ~ 425 ℃.Qhov kub ntawm 16Mn thiab 30Mn yog nyob nruab nrab ntawm - 40 ~ 400 ℃, uas feem ntau siv los hloov ASTM A105.Qhov nruab nrab siv tau yog saturated chav thiab superheated chav.Cov khoom siv roj kub thiab tsis kub, cov roj liquefied, compressed cua, dej, roj av, thiab lwm yam.
5. Tsawg kub carbon steel (LCB) Tsawg kub carbon steel thiab tsis tshua muaj nickel alloy hlau tuaj yeem siv rau hauv qhov kub thiab txias hauv qab xoom, tab sis tsis tuaj yeem txuas mus rau thaj tsam cryogenic.Valves ua los ntawm cov ntaub ntawv no tsim nyog rau cov xov xwm hauv qab no, xws li dej hiav txwv, carbon dioxide, acetylene, propylene thiab ethylene.
Nws muaj feem xyuam rau qhov ntsuas kub qis nrog kev ua haujlwm kub ntawm - 46 ~ 345 ℃.
6. Cov li qub ua los ntawm cov hlau tsis tshua muaj hlau (WC6, WC9) thiab cov hlau tsis tshua muaj hlau (xws li carbon molybdenum steel thiab chromium molybdenum steel) tuaj yeem siv rau ntau qhov chaw ua haujlwm, suav nrog saturated thiab superheated chav, txias thiab kub roj, roj ntuj. thiab huab cua.Kev ua haujlwm kub ntawm carbon steel valve tuaj yeem yog 500 ℃, thiab cov hlau tsis tshua muaj hlau valve tuaj yeem siab tshaj 600 ℃.Thaum qhov kub thiab txias, cov khoom siv hluav taws xob ntawm cov hlau tsis muaj hlau yog siab dua li cov pa roj carbon steel.
Kub kub thiab siab siab li qub muaj feem xyuam rau qhov nruab nrab tsis corrosive nrog kev khiav hauj lwm kub ntawm - 29 ~ 595 ℃;C5 thiab C12 muaj feem xyuam rau qhov kub thiab txias li qub rau corrosive media nrog kev ua haujlwm kub ntawm - 29 thiab 650 ℃.
7. Austenitic stainless hlau Austenitic stainless hlau muaj li ntawm 18% chromium thiab 8% npib tsib xee.18-8 austenitic stainless hlau feem ntau yog siv los ua lub cev lub cev thiab cov khoom siv lub kaus mom nyob rau hauv qhov kub thiab txias thiab muaj zog corrosion.Ntxiv molybdenum rau 18-8 stainless hlau matrix thiab me ntsis nce nickel cov ntsiab lus yuav ua rau nws cov corrosion kuj.Cov li qub ua los ntawm cov hlau no tuaj yeem siv dav hauv kev lag luam tshuaj, xws li xa cov acetic acid, nitric acid, alkali, tshuaj dawb, zaub mov, kua txiv hmab txiv ntoo, carbonic acid, tanning kua thiab ntau lwm yam khoom siv tshuaj.
Txhawm rau siv rau qhov kub thiab txias thiab hloov pauv cov khoom siv ntxiv, niobium ntxiv rau cov hlau tsis muaj steel, uas yog hu ua 18-10-Nb.Qhov kub tuaj yeem yog 800 ℃.
Austenitic stainless hlau feem ntau yog siv los ntawm qhov kub thiab txias thiab yuav tsis nkig, yog li li qub ua los ntawm cov khoom no (xws li 18-8 thiab 18-10-3Mo) yog qhov tsim nyog rau kev ua haujlwm ntawm qhov kub thiab txias.Piv txwv li, nws thauj cov roj ua kua, xws li cov nkev, biogas, oxygen thiab nitrogen.
Nws yog siv rau li qub nrog corrosive nruab nrab nrog kev khiav hauj lwm kub ntawm - 196 ~ 600 ℃.Austenitic stainless hlau kuj yog ib qho khoom siv zoo tshaj plaws uas tsis muaj qhov kub thiab txias.
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8. Plastics thiab ceramics yog ob qho tib si cov khoom tsis yog xim hlau.Qhov loj tshaj plaws ntawm cov khoom siv tsis yog xim hlau yog lawv qhov muaj zog corrosion kuj, thiab txawm tias muaj qhov zoo uas cov khoom siv hlau tsis tuaj yeem muaj.Nws yog feem ntau siv tau rau corrosive media nrog nominal siab PN ≤ 1.6MPa thiab ua haujlwm kub tsis tshaj 60 ℃, thiab tsis muaj tshuaj lom ib leeg UNION BALL VALVE kuj tseem siv tau rau kev lag luam dej.Cov khoom siv ntawm qhov tseem ceeb ntawm lub valve yuav tsum xub xav txog cov khoom siv lub cev (kub, siab) thiab tshuaj lom neeg (corrosivity) ntawm qhov nruab nrab ua haujlwm.Nyob rau tib lub sijhawm, nws kuj tseem yuav tsum paub qhov kev huv ntawm qhov nruab nrab (txawm tias muaj cov khoom sib xyaw).Tsis tas li ntawd, cov kev cai thiab cov kev cai ntawm lub xeev thiab cov neeg siv department yuav tsum raug xa mus rau.
Ntau yam khoom siv tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov khoom siv li qub nyob rau hauv ntau yam kev ua haujlwm.Txawm li cas los xij, qhov kev pabcuam nyiaj txiag tshaj plaws thiab kev ua haujlwm zoo tshaj plaws ntawm lub valve tuaj yeem tau txais los ntawm kev xaiv kom raug thiab tsim nyog ntawm cov khoom siv valve.
Post lub sij hawm: Feb-28-2023