Yog vim li cas rau xauv cov fasteners, muab tub lim thiab gaskets ntawm valve fittings thiab txoj kev los tiv thaiv kev xauv
Gasket tuaj yeem muab faib ua ob hom ntawm cov yas mos thiab tawv, cov yas mos feem ntau yog cov khoom siv tsis yog xim hlau, xws li cov ntawv tuab, yas, asbestos roj hmab board, PTFE thiab lwm yam. Hard feem ntau yog cov khoom siv hlau sib xyaw lossis cov ntaub ntawv hlau npog nrog pob zeb wool, alloy thiab pob zeb wool coiled. Gaskets tuaj nyob rau hauv ntau yam duab, nrog rau lub tiaj, puag ncig, oval, toothed, lens, thiab lwm yam tshwj xeeb duab. Kev tsim thiab tsim khoom ntawm lub rooj vag valve qhov chaw ntawm ntau cov ntaub ntawv raw, nrog rau ntau hom sib txawv ntawm lub teeb hlau thiab cov hlau zoo nkauj thiab aluminium alloy, ntau yam khoom tsis yog xim hlau.
1. Raw khoom rau fasteners
Fasteners feem ntau muaj xws li thauj tog rau nkoj bolts, ntau lub taub hau bolts thiab ceev. Fasteners ncaj qha dais quab yuam nyob rau hauv lub rooj vag li qub, uas yog qhov tseem ceeb heev kom tsis txhob poob ntawm kev tshaj tawm. Yog li, cov khoom siv raw xaiv yuav tsum ua kom muaj zog txaus thiab tawg toughness ntawm daim ntawv thov kub. Xaiv cov ntaub ntawv fastener raws li nruab nrab siab thiab kub.
Kev kho cua sov yuav tsum tau ua thaum siv cov khoom siv carbon steel. Thaum cov khoom nruj nruj muaj cov qauv tshwj xeeb corrosion kuj, Cr17Ni2, 2Cr13, 1Cr18Ni9 thiab lwm yam stainless acid resistant steel tuaj yeem xaiv.
Thib ob, muab cov khoom siv raw
Ntawm lub valve lub cev, cov ntim khoom yog siv los sau qhov chaw sab hauv tsev ntawm ib qho dej ntws valve packing chamber kom tsis txhob muaj xov xwm tawm los ntawm lub rooj zaum valve thiab ib leeg ntws valve packing chamber sab hauv tsev.
1. Qhov kev thov rau fillers
1) Zoo corrosion kuj, packing thiab nruab nrab kev sib cuag, yuav tsum muaj peev xwm tiv thaiv corrosion ntawm nruab nrab.
2) Compact qauv, packing tsis xau raws li qhov nruab nrab thiab ua haujlwm kub.
3) Tsis tshua muaj kev sib txhuam los txo qhov kev sib txhuam torque ntawm lub rooj zaum thiab ntim khoom.
2, hom kev ntim khoom
Kev ntim khoom tuaj yeem muab faib ua cov ntim yas mos thiab cov ntim nyuaj ob hom:
1) Cov hnab yas mos: nws yog ua los ntawm cov khoom cog ntsuab, uas yog, linen, paj rwb, linen, thiab lwm yam, los yog cov ntxhia, uas yog iav fiber ntau paj rwb, los yog iav fiber ntau paj rwb nrog hlau hlau thiab sab nraud coated flake graphite hlua woven, thiab hauv av rau hauv txoj kev muab tub lim, thiab cov cib fim tshiab ntawm cov khoom siv graphite hloov tau yooj yim hauv xyoo tas los no. Cov khoom cog ntsuab ntim cov khoom siv tau zoo dua, feem ntau yog siv rau qhov tsis tshua muaj siab li qub hauv 100 ℃; Mineral packing yog tsim rau 450-500 ℃ rooj vag valve. Nyob rau hauv xyoo tas los no, kev tsim cov yas O-ring raws li muab tub lim yog maj mam nrov, tab sis qhov nruab nrab kub yog feem ntau tswj nyob rau hauv 60 ℃. Kev ntim khoom nyob rau hauv qhov kub thiab txias siab valve kuj yog ua los ntawm cov ntshiab asbestos thiab flake graphite hmoov.
2) Hard packing: packing ua los ntawm cov ntaub ntawv hlau los yog hlau tov nrog asbestos, siab purity graphite thiab polytetrafluoroethylene nias calcination thiab tsim packing, hlau packing daim ntawv thov tsawg dua.
3, kev xaiv cov khoom ntim
Kev xaiv cov muab tub lim yuav tsum yog nyob ntawm qhov nruab nrab, qhov kub thiab txias los xaiv, cov khoom siv raw muaj cov ntsiab lus hauv qab no:
1) Roj rau daim ntaub asbestos, tuaj yeem xaiv raws li Table 5-2.
2) Cov ntaub yas asbestos: tuaj yeem xaiv raws li Table 5-3.
3) High purity graphite asbestos daim ntaub: asbestos daim ntaub coated rau hauv flake graphite, qhov kub thiab txias yuav siv tau saum toj no 450 ℃, lub siab ua hauj lwm yuav ncav cuag 16Mpa, feem ntau haum rau siab zog chav. Tsis ntev los no thiab maj mam siv lub siab tus neeg laus font muab tub lim, lap speed placement, compact structure.
4) polytetrafluoroethylene: Qhov no yog ib qho kev siv ntau dua nyob rau theem no. Tshwj xeeb tshaj yog muaj nyob rau ntawm qhov nruab nrab corrosive, tab sis qhov kub tsis tuaj yeem siab tshaj 200 ℃. Feem ntau, nws yog ua los ntawm cov neeg tua hluav taws lossis cov pas nrig, raws li pom hauv daim duab 5-1 hauv qab no.
Faj seeb: Tus naj npawb F qhia tias square, dhau-core los yog ib qho rau ob txoj hlua khi; Y qhia hais tias nws yog puag ncig, nrog ib tug twisted mandrel nyob rau hauv nruab nrab thiab ib mus rau ob txheej ntawm braid sab nraum; N txhais tau tias twisted.
Peb, cov khoom siv gasket
Lub gasket yog siv los sau 2 qhov chaw sib koom ua ke (xws li qhov chaw nruab nrab ntawm cov roj hluav taws xob phaj thiab lub valve ib leeg) ntawm txhua qhov tsis sib xws, txhawm rau kom tsis txhob muaj xov xwm tawm ntawm qhov sib koom ua ke.
1. Qhov kev thov rau sealing gaskets
Gasket cov ntaub ntawv muaj qee yam elasticity thiab plasticity thiab txaus compressive zog ntawm kev khiav hauj lwm kub los xyuas kom meej nruj. Nyob rau tib lub sijhawm, nws yuav tsum muaj kev tiv thaiv corrosion zoo dua.
2, gasket khoom hom thiab kev txiav txim
Gasket tuaj yeem muab faib ua ob hom ntawm cov yas mos thiab tawv, cov yas mos feem ntau yog cov khoom siv tsis yog xim hlau, xws li cov ntawv tuab, yas, asbestos roj hmab board, PTFE thiab lwm yam. Hard feem ntau yog cov khoom siv hlau sib xyaw lossis cov ntaub ntawv hlau npog nrog pob zeb wool, alloy thiab pob zeb wool coiled. Gaskets tuaj nyob rau hauv ntau yam duab, nrog rau lub tiaj, puag ncig, oval, toothed, lens, thiab lwm yam tshwj xeeb duab.
Cov khoom siv raw ntawm sealing gasket feem ntau yog 08, 10, 20 zoo carbon steel thiab 1Cr13, 1Cr18Ni9 stainless hlau phaj, qhov tseeb qhov tseeb thiab qhov xav tau ntawm qhov chaw smoothness yog siab heev, haum rau qhov kub thiab txias li qub. Cov khoom siv tsis yog xim hlau gasket cov khoom siv dav dav yog qhov zoo, nrog kev ua haujlwm me me tuaj yeem ua tiav sealing. Haum rau ultra-low kub thiab tsis tshua muaj siab valve. Gasket cov ntaub ntawv tuaj yeem xaiv raws li Table 5-4.
Table 5-4
Kev tsim thiab tsim khoom ntawm lub rooj vag valve qhov chaw ntawm ntau cov ntaub ntawv raw, nrog rau ntau hom sib txawv ntawm lub teeb hlau thiab cov hlau zoo nkauj thiab aluminium alloy, ntau yam khoom tsis yog xim hlau.
Cov khoom siv raw rau kev tsim thiab tsim cov khoom siv ntawm lub qhov rooj valve yuav tsum raug xaiv raws li cov hauv qab no:
1, ua hauj lwm nruab nrab siab, kub thiab yam ntxwv.
2, cov kabmob muaj peev xwm ntawm cov khoom thiab feem ntau ua lub luag haujlwm hauv cov qauv valve.
3. Cov txheej txheem ua tau zoo.
4. Raws li qhov ua tau raws li cov xwm txheej saum toj no, tus nqi qis yuav tsum tau ua.
Cov hlau fasteners hauv fasteners yeej ib txwm xeb rau ntau yam laj thawj. Thaum xeb tshwm sim, qee qhov fasteners yuav kaw tag nrho, ua rau poob ntawm kev ua haujlwm hauv kev ua haujlwm ntawm cov fasteners lawv tus kheej. Qhov tseeb, nws yog tsis yooj yim sua kom disassemble los yog xauv fasteners tsis tu ncua. Kev ua kom tiav ntawm cov fasteners tsuas yog tshwm sim hauv ob peb feeb xwb, yog li nws yuav tsum muaj kev nkag siab zoo dua thiab siv cov fasteners los tiv thaiv kev xauv. Fastener locking yog feem ntau nyob rau hauv stainless hlau phaj los yog aluminium alloy khoom ua los ntawm cov khoom ...
Hlau fasteners yeej ib txwm xeb rau ntau yam laj thawj. Thaum xeb tshwm sim, qee qhov fasteners yuav kaw tag nrho, ua rau poob ntawm kev ua haujlwm ntawm kev ua haujlwm ntawm fasteners lawv tus kheej. Qhov tseeb, nws yog tsis yooj yim sua kom disassemble los yog xauv fasteners tsis tu ncua. Kev ua kom tiav ntawm cov fasteners tsuas yog tshwm sim hauv ob peb feeb xwb, yog li nws yuav tsum muaj kev nkag siab zoo dua thiab siv cov fasteners los tiv thaiv kev xauv.
1. Lub ntsiab yog vim li cas rau fastener xauv
Kev xauv cov fasteners feem ntau tshwm sim ntawm cov khoom lag luam uas ua los ntawm cov hlau tsis muaj steel phaj lossis cov khoom siv aluminium alloy, feem ntau vim tias cov khoom siv hlau sib xyaw nws tus kheej muaj peev xwm los tiv thaiv xeb, ib zaug hlau nto ntawm fasteners puas lawm, nws yog ib qho yooj yim los tshwm oxide txheej los muab. txij nkawm thiab tiv thaiv lub aggravation ntawm xeb, tab sis thaum lub fasteners yog nruj, lub siab kub generated los ntawm cov tshuaj tiv thaiv quab yuam yuav ua puas lub oxide txheej thiab txhawb lub plugging los yog txiav ntawm cov ntaub ntawv hlau, uas ua rau adhesion, uas yog tiag tiag locking.
2, fastener los tiv thaiv txoj kev xauv:
★ Kev kaw cov fasteners tsis tuaj yeem zam tau kiag li, tab sis peb tuaj yeem txo qhov tshwm sim ntawm kev kaw haujlwm los ntawm kev ua tib zoo mloog rau txhua lub ntsiab lus, xws li ua kom lub zog ntawm cov fasteners, xaiv cov txiv ntseej thiab bolts nrog ntau lub zog compressive, thiab lwm yam.
★ Fastener ntsia hlau tu tsis tu kuj muaj qee yam cuam tshuam rau kev xauv, thaum lub ntsia hlau tsis du los yog tsis tu, xauv ntau zaus, yog li ua ntej siv los xyuas kom meej lub fastener tu ua hauj lwm, hlau pin los yog khib nyiab.
★ Tom qab tsim nyog thiab nruab nrab wetting ua ntawm fasteners, lub tshav kub generated los ntawm cov khoom hlau txoj hauj lwm yuav txo tau zoo vim lub bearing quab yuam, uas yuav txo tau qhov tshwm sim ntawm fastener locking.
★ Cov fasteners yuav tsum tau muab kaw thiab muab tso rau hauv txoj kev kom raug, kev kaw ntom nti tsawg dua.
Post lub sij hawm: Feb-21-2023
