Hauv kev tswj cov dej hauv kev lag luam, kev xaiv cov khoom siv valve ncaj qha txiav txim siab txog kev ua haujlwm ntawm lub neej, kev ua haujlwm ruaj khov thiab kev nyab xeeb ntawm cov cuab yeej, thiab yog qhov sib txuas tseem ceeb ntawm kev ua haujlwm thiab tus nqi. Lub hauv paus ntsiab lus tseem ceeb ntawm kev xaiv cov khoom siv yog kom phim cov ntaub ntawv nrog cov yam ntxwv nruab nrab thiab kev ua haujlwm tsis zoo, zam kev tsis ua haujlwm los ntawm corrosion, hnav, kub thiab kub siab thiab lwm yam.
Valve xaiv cov khoom siv yuav tsum pib los ntawm ob qhov loj me: cov khoom siv lub cev thiab cov khoom siv trim. Cov khoom siv lub cev feem ntau dais nruab nrab siab thiab ib puag ncig cuam tshuam, thiab ntau hom tau muab faib ua cov ntaub ntawv hlau thiab tsis yog- cov ntaub ntawv hlau. Ntawm cov khoom siv hlau, cam khwb cia hlau yog tsawg- nqi thiab muaj kev ua haujlwm zoo. Nws yog qhov tsim nyog rau kev ua haujlwm tsis muaj zog siab nrog cov xov xwm tsis muaj zog xws li dej thiab huab cua, thiab yog ib qho kev xaiv rau cov dej thiab cov kav dej thiab HVAC. Cam khwb cia hlau muaj lub zog zoo dua qub thiab kub ua haujlwm dua li cov hlau cam khwb cia, tuaj yeem ua haujlwm nruab nrab thiab siab -siab chav, roj thiab lwm yam xov xwm, thiab tau dav siv hauv cov pa ua haujlwm ntawm petrochemical thiab fais fab kev lag luam. Stainless hlau (xws li 304, 316) muaj kev tiv thaiv corrosion zoo heev, ua rau nws yog thawj qhov kev xaiv rau corrosive media xws li cov kua qaub-cov kev daws teeb meem thiab dej hiav txwv. 316 stainless hlau muaj zog pitting corrosion kuj vim qhov sib ntxiv ntawm molybdenum, haum rau siab -corrosion ib puag ncig xws li cov ntug dej hiav txwv thiab cov nroj tsuag tshuaj. Cov ntaub ntawv tshwj xeeb alloy (xws li Hastelloy, Monel alloy) yog siv rau kev ua hauj lwm huab cua nrog corrosion muaj zog, siab kub thiab siab siab, xws li muaj zog acid thiab siab - kub molten ntsev, tab sis tus nqi siab thiab yuav tsum tau xaiv raws li xav tau. Tsis yog- cov khoom siv hlau xws li yas thiab ceramics: yas li qub (PVC, PP) muaj zog corrosion kuj thiab lub teeb yuag, haum rau tsawg-siab corrosive media nyob rau hauv pej xeem los yog lub teeb kev lag luam scenarios, thaum ceramic li qub muaj zoo heev hnav tsis kam thiab yuav siv tau rau abrasive xov xwm uas muaj cov khoom hais.
Valve trim cov ntaub ntawv yog nyob rau hauv kev sib cuag ncaj qha nrog nruab nrab, txiav txim siab sealing kev ua tau zoo thiab hnav tsis kam, thiab yuav tsum tau teem rau raws li hnav thiab corrosion ntawm nruab nrab. Cov khoom siv sib khi zoo sib xws muaj xws li tooj liab alloys, haum rau qis - siab thiab qis - dej kub thiab dej tawm; stainless hlau alloy sealing nto muaj siab hardness thiab zoo corrosion kuj, haum rau nruab nrab thiab siab -siab corrosive media; cemented carbide (xws li surfacing Stellite alloy) muaj qhov nyuaj siab heev, zoo heev hnav thiab yaig tsis kam, haum rau kev tshaj tawm uas muaj cov khoom siv los yog kev ua haujlwm siab sib txawv. Valve qia cov ntaub ntawv yuav tsum sib npaug zog thiab corrosion kuj: carbon steel quenched thiab tempered yuav siv tau rau cov pa ua hauj lwm tej yam kev mob, thiab stainless hlau yog nyiam rau corrosive ua hauj lwm tej yam kev mob.
Ntxiv nrog rau cov yam ntxwv nruab nrab, kev ua haujlwm tsis zoo kuj tseem ceeb rau kev xaiv cov khoom siv. Nyob rau hauv siab - kub ua hauj lwm tej yam kev mob, lub thermal stability thiab oxidation kuj ntawm cov ntaub ntawv yuav tsum tau xav txog. Piv txwv li, chrome-molybdenum steel yog nyiam rau siab-kub chav tshuab; rau qis- qhov kub thiab txias ua haujlwm, qhov qis- qhov kub thiab txias ntawm cov ntaub ntawv yuav tsum tau ua tib zoo saib kom tsis txhob qis- qhov kub thiab txias tawg, thiab qis- kub steel feem ntau yog siv. High{10}}siab ua hauj lwm tej yam kev mob yuav tsum nruj me ntsis rau cov neeg kho tshuab lub zog ntawm cov ntaub ntawv, thiab siab -lub zog cam khwb cia hlau los yog forged steel yuav tsum tau xaiv. Tsis tas li ntawd, cov khoom siv hauv nruab nrab yuav ua rau hnyav dua qhov hnav ntawm lub valve, yog li hnav- cov ntaub ntawv tiv thaiv lossis cov txheej tiv thaiv yuav tsum tau xaiv.
Hauv cov txheej txheem xaiv tiag tiag, nws tseem yuav tsum sib npaug ntawm tus nqi thiab kev ua haujlwm. Tus nqi - zoo cam khwb cia hlau thiab cam khwb cia hlau yuav tsum nyiam rau cov pa ua hauj lwm tej yam kev mob; stainless hlau thiab tshwj xeeb alloy cov ntaub ntawv yuav tsum tau xaiv rau corrosive los yog huab cua ua hauj lwm tej yam kev mob kom tsis txhob nquag tu los ntawm kev xaiv cov khoom tsis tsim nyog, uas yuav ua rau kom tus nqi tag nrho. Nyob rau tib lub sijhawm, cov qauv kev lag luam cuam tshuam yuav tsum tau ua raws, nrog rau kev tsim cov kev cai ntawm kev ua haujlwm tshwj xeeb kom ua raws li kev xaiv.
Hauv kev xaus, kev xaiv cov khoom siv valve yog qhov kev txiav txim siab zoo- cov txheej txheem ua, uas yuav tsum tau ua tib zoo xav txog peb lub ntsiab lus: cov yam ntxwv nruab nrab, kev ua haujlwm tsis zoo thiab cov nqi siv nyiaj, thiab ua kom raug cov khoom ua tau zoo nrog cov kev xav tau tiag tiag kom ntseeg tau tias lub sijhawm ntev - kev ua haujlwm ruaj khov ntawm li qub.
Khoom Parameters
| Qeb khoom | Cov khoom siv tshwj xeeb | Siv tau nruab nrab | Siv tau cov xwm txheej ua haujlwm | Tus Nqi Theem | Core Zoo | Sau ntawv | ||||||||||||
| Cov khoom siv hlau lub cev | Cast Iron | Dej, cua, dej nruab nrab | Tsis tshua muaj siab (tsawg dua los yog sib npaug rau 1.6MPa), qhov kub thiab txias | Tsawg | Tus nqi qis, zoo heev casting kev ua tau zoo | Tsis yog-corrosion-resistant, tsis yog-siab-kub-resistant; zam kev siv cov kua qaub- hauv paus media | ||||||||||||
| Cam khwb cia hlau (WCB) | Chav tsev, cov khoom siv roj, cov roj ntsha ntuj | Nruab nrab thiab siab siab (tsawg dua los yog sib npaug rau 10MPa), nruab nrab kub (tsawg dua los yog sib npaug rau 425 degree) | Tsawg- Nruab nrab | High mechanical zog, kub kuj zoo dua cam khwb cia hlau | Tsis muaj zog corrosion kuj; tsis haum rau corrosive media | |||||||||||||
| 304 Stainless hlau | Cov kua qaub/alkali tsis muaj zog, dej tshiab, zaub mov- qib xov xwm | Nruab nrab thiab tsis tshua muaj siab, ib txwm mus rau nruab nrab kub | Nruab nrab | Zoo corrosion kuj, sib xws nrog kev tu cev | Tsis tiv taus chloride ion corrosion; tsis txhob siv nrog dej hiav txwv | |||||||||||||
| 316 Stainless hlau | Cov dej hiav txwv, chloride- muaj cov tshuaj, cov kua qaub qis thiab alkalis | Nruab nrab thiab siab siab, nruab nrab kub | Nruab nrab-High | Muaj zog pitting corrosion kuj, zoo corrosion kuj tshaj 304 | Tus nqi siab dua 304; tsis pom zoo rau tsis tu ncua tsis yog -corrosive ua hauj lwm tej yam kev mob | |||||||||||||
| Hastelloy | Muaj zog acids (hydrochloric acid, sulfuric acid), muaj zog oxidants | Kev ua haujlwm siab heev nrog kev kub siab, kev kub siab thiab muaj zog corrosion | Siab | Zoo heev tiv thaiv kom muaj zog corrosion | kim; tsuas yog tsim nyog rau kev ua haujlwm hnyav tshwj xeeb | |||||||||||||
| Tsis yog - Cov Khoom Siv Lub Cev Hlau | PVC / PP yas | Acid-cov kev daws teeb meem hauv qab, qis- cov tshuaj lom neeg ntxiv | Tsis tshua muaj siab (tsawg dua los yog sib npaug rau 1.0MPa), qhov kub thiab txias | Tsawg | Lub teeb yuag, muaj zog corrosion kuj, yooj yim installation | Tsis yog-siab-kub-resistant, tsis tshua muaj zog txhua yam; tsis haum rau siab -siab ua hauj lwm tej yam kev mob | ||||||||||||
| Ceramic | Slurry muaj cov khoom siv, cov khoom siv abrasive | Tsawg mus rau nruab nrab siab, qhov kub thiab txias | Nruab nrab | Tsis tshua muaj siab hnav tsis kam thiab corrosion kuj | Siab brittleness, tsis muaj zog tiv thaiv; zam kev vibration hnyav | |||||||||||||
| Trim Sealing Surface Materials | Tooj Alloy | Dej, qis -siab chav | Tsis tshua muaj siab, qis kub (tsawg dua lossis sib npaug li 200 degree) | Tsawg | Kev ua haujlwm zoo sealing, ua haujlwm yooj yim | Tsis yog-corrosion-resistant, tsis yog-siab- kub thiab siab-siab-resistant | ||||||||||||
| Stainless hlau Alloy | Nruab nrab corrosive media, cov khoom siv roj | Nruab nrab thiab siab siab, nruab nrab kub | Nruab nrab | High hardness, corrosion kuj, dav applicability | Tsis haum rau abrasive ua hauj lwm tej yam kev mob nrog nyuaj hais | |||||||||||||
| Stellite Alloy (Overlay Vuam) | Slurry uas muaj cov khoom, siab sib txawv media | Kev kub siab, kev kub siab thiab siab hnav ua haujlwm | Nruab nrab-High | Zoo hnav thiab erosion kuj | Cov nqi ua haujlwm siab; yuav tsum muaj kev tshaj lij welding tshuab | |||||||||||||
| Cemented Carbide | High abrasive ntxhia slurry, thee hmoov | Kev ua haujlwm hnyav hnyav heev | Siab | Tsis tshua muaj siab hardness, ntev kev pab cuam lub neej | High brittleness; zam kev ua haujlwm qhuav | |||||||||||||
| Valve Stem Materials | Quenched thiab Tempered Carbon Steel | Tsis yog -corrosive media, roj khoom | Tsis tu ncua -siab thiab nruab nrab- qhov kub thiab txias ua haujlwm | Tsawg | Mechanical zog ua tau raws li qhov yuav tsum tau ua, tus nqi qis | Yooj yim rau xeb; tsis haum rau huab cua los yog corrosive ib puag ncig | ||||||||||||
| 2Cr13 Stainless hlau | Me ntsis corrosive media, dej vapor | Nruab nrab-siab thiab nruab nrab- qhov kub thiab txias ua haujlwm | Nruab nrab | Zoo corrosion kuj, siab zog | Kev saib xyuas tsis tu ncua rau kev tiv thaiv xeb yuav tsum tau ua | |||||||||||||
| 316 Stainless hlau | Muaj zog corrosive media, dej hiav txwv | Corrosive ua hauj lwm tej yam kev mob | Nruab nrab-High | Zoo heev corrosion kuj thiab pitting kuj | Tus nqi siab dua carbon steel; tsis tsim nyog rau kev ua haujlwm tsis tu ncua | |||||||||||||
Yog tias koj muaj lus nug txog kev hais lus lossis kev koom tes, thov koj xa email tuaj rau peb ntawmgaoxiaoxinlang@sina.cn
