Dab tsi yog qhov tshwj xeeb uas yuav tsum tau ua rau lub valve qia xaiv

Cov khoom siv rau kev tsim cov khoom siv valve yuav tsum raug xaiv raws li cov hauv qab no:

1. Lub siab, kub thiab cov yam ntxwv ntawm qhov nruab nrab ua haujlwm.

2. Lub zog ntawm qhov thiab nws txoj haujlwm hauv lubvalveqauv.

3. Nws muaj zoo manufacturability.

4. Yog tias cov xwm txheej saum toj no tau ua tiav, yuav tsum muaj tus nqi qis dua.

Cov khoom siv qia

Thaum lub sij hawm qhib thiab kaw ntawm lub valve, lub valve qia bears lub zog ntawm nro, siab thiab torsion, thiab yog nyob rau hauv ncaj qha kev sib cuag nrog nruab nrab.Nyob rau tib lub sijhawm, muaj kev sib txhuam kev sib txhuam nrog kev ntim khoom.Yog li ntawd, cov khoom siv valve yuav tsum txaus ntawm qhov ntsuas kub.Lub zog thiab kev cuam tshuam toughness, ib qho degree ntawm corrosion kuj thiab khawb kuj, thiab zoo manufacturability.

Feem ntau siv valve qia cov ntaub ntawv yog raws li nram no.

1. Carbon hlau

Thaum siv hauv dej thiab chav nruab nrab uas tsis tshua muaj siab thiab nruab nrab kub tsis tshaj 300 ℃, A5 zoo tib yam carbon steel feem ntau yog siv.

Thaum siv nyob rau hauv dej thiab chav nruab nrab nrog nruab nrab siab thiab nruab nrab kub tsis tshaj 450 ℃, 35 zoo carbon steel feem ntau yog siv.

2. Alloy hlau

40Cr (chrome steel) feem ntau yog siv thaum nws siv rau nruab nrab siab thiab siab siab, thiab qhov nruab nrab kub tsis tshaj 450 ℃ hauv dej, chav dej, roj av thiab lwm yam xov xwm.

38CrMoALA nitriding hlau tuaj yeem siv tau thaum nws siv hauv dej, chav dej thiab lwm yam xov xwm nrog kev kub siab thiab nruab nrab kub tsis tshaj 540 ℃.

25Cr2MoVA chromium molybdenum vanadium hlau feem ntau yog siv thaum siv nyob rau hauv siab siab chav nruab nrab nrog nruab nrab kub tsis tshaj 570 ℃.

Peb, stainless acid-resistant steel

Nws yog siv rau cov xov xwm tsis muaj corrosive thiab tsis muaj zog corrosive nrog nruab nrab siab thiab siab siab, thiab qhov nruab nrab kub tsis tshaj 450 ° C.1Cr13, 2Cr13, 3Cr13 chromium stainless hlau tuaj yeem xaiv.

Thaum siv hauv corrosive media, stainless acid-resistant steel xws li Cr17Ni2, 1Cr18Ni9Ti, Cr18Ni12Mo2Ti, Cr18Ni12Mo3Ti, thiab PH15-7Mo nag lossis daus hardening hlau tuaj yeem xaiv.

Plaub, kub-resistant steel

Thaum siv rau qhov kub thiab txias li qub uas nws qhov nruab nrab kub tsis tshaj 600 ℃, 4Cr10Si2Mo martensitic tshav kub-resistant steel thiab 4Cr14Ni14W2Mo austenitic tshav kub-resistant steel tuaj yeem xaiv.