Nyob rau hauv cov kua dej conveying system, lub valve yog ib tug indispensable tswj tivthaiv, uas yog feem ntau muaj lub luag hauj lwm ntawm kev tswj, kev sib hloov, los tiv thaiv rov qab, txiav tawm, thiab shunt. Lub valve yog dav siv nyob rau hauv industrial thiab civil teb. Qhov kub thiab txias valve yog ib hom siv dav hauv li qub. Nws cov khoom tshwj xeeb yog raws li hauv qab no: kev ua haujlwm zoo quenching, sib sib zog nqus quenching tuaj yeem ua tau; zoo weldability; kev nqus zoo ntawm kev cuam tshuam, nws yog qhov nyuaj rau kev puas tsuaj los ntawm kev ua phem; Temper brittleness nyiam tsawg dua thiab lwm yam. Muaj kuj muaj ntau yam ntawm high-temperature li qub. Qhov ntau tshaj yog kub-kubnpauj npaim li qub, kub kub pob li qub, high-temperature filters, thiab high-temperature rooj vag li qub.

High-temperature li qub muaj xws li high-temperature gate valves, high-temperature shut-off li qub, high-temperature check li qub, high-temperature ball valves, high-temperature npauj npaim li qub, high-temperature needle valve, high-temperature throttle li qub, thiab high-temperature siab txo li qub. Ntawm lawv, feem ntau siv yog rooj vag li qub, lub ntiaj teb li qub, kos li qub, pob li qub thiab npauj npaim li qub.

Kev kub siab ua haujlwm feem ntau suav nrog kev kub siab, kub Ⅰ, kub Ⅱ, kub Ⅲ, kub Ⅳ, thiab kub Ⅴ, uas yuav tsum tau qhia nyias hauv qab no.

1. Sub-siab kub

Sub-high kub txhais tau hais tias qhov kub thiab txias ua haujlwm ntawm lub valve yog nyob rau hauv cheeb tsam ntawm 325 ～425 ℃. Yog tias qhov nruab nrab yog dej thiab chav, WCB, WCC, A105, WC6 thiab WC9 feem ntau yog siv. Yog tias qhov nruab nrab yog cov roj uas muaj leej faj, C5, CF8, CF3, CF8M, CF3M, thiab lwm yam, uas tiv taus sulfide corrosion, feem ntau yog siv. Lawv feem ntau yog siv nyob rau hauv atmospheric thiab siab txo cov cuab yeej thiab ncua coking li hauv refineries. Lub sijhawm no, li qub ua los ntawm CF8, CF8M, CF3 thiab CF3M tsis yog siv rau kev tiv thaiv corrosion ntawm cov kua qaub, tab sis yog siv rau cov khoom siv roj ntsha thiab cov roj thiab cov kav dej. Hauv qhov xwm txheej no, qhov siab tshaj plaws ua haujlwm kub ntawm CF8, CF8M, CF3 thiab CF3M yog 450 ° C.

2. Kub kub Ⅰ

Thaum ua haujlwm kub ntawm lub valve yog 425 ～550 ℃, nws yog chav kawm kub siab I (hu ua PI chav kawm). Cov khoom tseem ceeb ntawm PI qib valve yog "siab kub Ⅰ qib nruab nrab carbon chromium npib tsib xee tsis tshua muaj ntiaj teb titanium zoo kub-resistant steel" nrog CF8 raws li cov qauv hauv ASTMA351 tus qauv. Vim tias qib PI yog lub npe tshwj xeeb, lub tswv yim ntawm high-temperature stainless hlau (P) tau suav nrog ntawm no. Yog li, yog tias qhov nruab nrab ua haujlwm yog dej lossis chav dej, txawm hais tias qhov kub kub steel WC6 (t≤540 ℃) lossis WC9 (t≤570 ℃) kuj tuaj yeem siv, thaum cov khoom siv roj sulfur kuj tuaj yeem siv cov hlau kub kub. C5 (ZG1Cr5Mo), tab sis Lawv tsis tuaj yeem hu ua PI-chav kawm ntawm no.

3. Kub kub II

Kev ua haujlwm kub ntawm lub valve yog 550 ～650 ℃, thiab nws raug cais raws li qhov kub thiab txias Ⅱ (hu ua P Ⅱ). PⅡ chav kawm kub kub valve yog tsuas yog siv nyob rau hauv hnyav roj catalytic cracking ntaus ntawv ntawm refinery. Nws muaj qhov kub thiab txias hauv ob sab phlu hnav-resistant rooj vag valve siv nyob rau hauv peb-tso nozzle thiab lwm yam. Cov khoom tseem ceeb ntawm PⅡ qib valve yog "siab kub Ⅱ qib nruab nrab carbon chromium npib tsib xee tsis tshua muaj ntiaj teb titanium tantalum reinforced heat-resistant steel" nrog CF8 raws li cov qauv hauv ASTMA351 tus qauv.

4. Kub kub III

Kev ua haujlwm kub ntawm lub valve yog 650 ～730 ℃, thiab nws raug cais raws li qhov kub thiab txias III (hu ua PⅢ). PⅢ chav kawm kub kub li qub feem ntau yog siv hauv cov roj hnyav hnyav catalytic cracking units hauv refineries. Cov khoom tseem ceeb ntawm PⅢ chav kawm kub siab valve yog CF8M raws li ASTMA351.

5. Kub kub Ⅳ

Kev ua haujlwm kub ntawm lub valve yog 730 ～816 ℃, thiab nws raug ntsuas raws li qhov kub siab IV (hu ua PIV luv luv). Lub sab sauv txwv ntawm kev ua hauj lwm kub ntawm PIV valve yog 816 ℃, vim hais tias qhov siab tshaj plaws kub yog muab los ntawm tus qauv ASMEB16134 siab-temperature qib xaiv rau valve tsim yog 816 ℃ (1500υ). Tsis tas li ntawd, tom qab ua haujlwm kub siab tshaj 816 ° C, cov hlau yog ze rau nkag mus rau thaj tsam forging kub. Lub sijhawm no, cov hlau yog nyob rau hauv cov yas deformation cheeb tsam, thiab cov hlau muaj cov yas zoo, thiab nws yog ib qho nyuaj rau kev tiv thaiv kev ua haujlwm siab thiab cuam tshuam lub zog thiab ua kom nws tsis txhob deforming. Cov khoom tseem ceeb ntawm P Ⅳ valve yog CF8M nyob rau hauv tus qauv ASTMA351 raws li cov qauv yooj yim "siab kub Ⅳ nruab nrab carbon chromium nickel molybdenum tsawg lub ntiaj teb titanium tantalum reinforced tshav kub-resistant steel". CK-20 thiab ASTMA182 tus qauv F310 (xws li C cov ntsiab lus ≥01050%) thiab F310H kub-resistant stainless hlau.

6, kub siab Ⅴ

Kev ua haujlwm kub ntawm lub valve yog siab dua 816 ℃, hu ua PⅤ, PⅤ kub siab valve (rau kaw-off li qub, tsis tswj cov npauj npaim li qub) yuav tsum tau txais cov qauv tsim tshwj xeeb, xws li cov ntaub ntawv rwb thaiv tsev hauv ob sab phlu lossis dej lossis roj cua txias. xyuas kom lub cev ua haujlwm ntawm lub valve. Yog li ntawd, qhov kev txwv sab saud ntawm kev ua haujlwm kub ntawm PⅤ chav kawm siab kub valve tsis tau teev tseg, vim tias qhov ntsuas kub ua haujlwm ntawm cov tswj valve tsis yog tsuas yog txiav txim siab los ntawm cov khoom, tab sis los ntawm cov qauv tsim tshwj xeeb, thiab lub hauv paus ntsiab lus ntawm kev tsim qauv. yog tib yam. PⅤ qib siab kub valve tuaj yeem xaiv cov khoom tsim nyog uas tuaj yeem ua tau raws li lub valve raws li nws qhov nruab nrab ua haujlwm thiab ua haujlwm siab thiab cov qauv tsim tshwj xeeb. Hauv PⅤ chav kawm kub kub, feem ntau yog lub flapper lossis npauj npaim valve ntawm flue flapper valve lossis npauj npaim valve feem ntau yog xaiv los ntawm HK-30 thiab HK-40 high-temperature alloys hauv ASTMA297 tus qauv. Corrosion resistant, tab sis tsis muaj peev xwm tiv taus kev poob siab thiab siab loads.