Forged Steel Flanged Kawg Globe Valve

RF kawg forged steel ntiaj teb valve: qhib thiab kaw qhov chaw ntawm lub valve yog ntsaws-puab discs, lub sealing nto yog tiaj tus los yog conical, thiab lub disc txav mus rau hauv ib txoj kab ncaj nraim ntawm cov kab nruab nrab ntawm cov kua. Qhov kev txav ntawm lub qia valve yog nqa qws hom, thiab lub ntiaj teb valve tsuas yog haum rau qhib thiab kaw tag nrho, thiab tsis tso cai rau kho thiab throttle.

Tus qauv tsim raws li: API 602

Lub ntsej muag rau lub ntsej muag: ASME B16.10

Flanged kev twb kev txuas: ASME B16.5

Butt welded kawg: ASME B16.25

Qhov (socket) vuam xaus: ASME B16.11

Screwed xaus: ASME B1.20.1

Kev kuaj thiab tshuaj xyuas: API 598

Feem ntau, nqa tsuas yog 1/4 ntawm qhov chaw nres nkoj valve, ua kom lub sijhawm qhib / kaw luv.
Tsuas yog ib lub ntsej muag sealing muaj nyob rau ntawm lub valve lub cev thiab disc.

Lub valve yog tsim los ua lub rooj zaum rov qab sealing qauv.

Siv tau yooj yim thiab woven graphite kev sib koom tes hom ntim.

Cov khoom siv lub cev: stainless hlau, forged hlau, hlau alloy

Nominal txoj kab uas hla: 1/2" -2 1/2"

Siab ntau: Chav kawm 150-2500(PN10 ~ PN420)

Xaus kev sib txuas: RF

Ua haujlwm kub: -29 degree -560 degree

Kev Ua Haujlwm: Handwheel, Iav Box, Electric Actuator, thiab lwm yam.

Rau qhov yuav tsum tau ua ntawm lub valve sealing kev ua tau zoo, nws yog ib qho tsim nyog los tiv thaiv kom tsis txhob tawm. Raws li qhov sib txawv ntawm qhov sib txawv thiab qib ntawm qhov to, qhov sib txawv ntawm lub valve yog qhov sib txawv. Yog li ntawd, qhov sib txawv ntawm kev tiv thaiv kev tiv thaiv yuav tsum tau muab tso rau pem hauv ntej.

Valve Sealing Txoj Cai

Kev sib khi yog los tiv thaiv kom tsis txhob tawm, yog li lub hauv paus ntsiab lus ntawm kev sib khi valve kuj tau kawm los ntawm kev tiv thaiv cov pa tawm. Muaj ob yam tseem ceeb uas ua rau cov dej xau, ib qho yog qhov tseem ceeb tshaj plaws uas cuam tshuam rau kev ua haujlwm sealing, uas yog, muaj qhov sib txawv ntawm cov khub sealing, thiab lwm yam yog qhov sib txawv ntawm ob sab ntawm lub sealing khub. Valve sealing txoj cai tseem raug tshuaj xyuas los ntawm plaub yam: kua sealing, gas sealing, to channel sealing txoj cai thiab valve sealing khub.

Sealability ntawm cov kua

Lub sealing khoom ntawm cov kua yog tiav los ntawm viscosity thiab nto nro ntawm cov kua. Thaum lub capillary xau los ntawm lub valve yog ntim nrog roj, qhov nro ntawm qhov chaw tuaj yeem rub cov kua los yog qhia cov kua rau hauv capillary. Yog li ntawd lub kaum sab xis yog tsim. Thaum lub kaum sab xis qis dua 90 degrees, cov kua yuav raug txhaj rau hauv lub raj capillary, uas yuav ua rau kom tawg. Cov dej ntws tawm tshwm sim vim muaj cov khoom sib txawv ntawm qhov nruab nrab. Kev ntsuam xyuas nrog cov xov xwm sib txawv yuav ua rau cov txiaj ntsig sib txawv raws li tib lub sijhawm. Koj tuaj yeem siv dej, cua lossis kerosene. Cov dej ntws kuj tshwm sim thaum lub kaum sab xis siab dua 90 degrees. Vim hais tias nws muaj feem xyuam rau roj los yog waxy zaj duab xis ntawm hlau nto. Thaum cov zaj duab xis ntawm cov chaw no yog yaj, cov yam ntxwv ntawm cov hlau nto hloov. Cov kua dej yav dhau los tsis suav nrog yuav nkag mus rau qhov chaw ntub dej thiab xau. Raws li cov xwm txheej saum toj no, raws li Poisson cov qauv, lub hom phiaj ntawm kev tiv thaiv cov dej xau los yog txo qis tuaj yeem ua tiav los ntawm kev txo qis capillary txoj kab uas hla thiab nruab nrab viscosity.

Sealability ntawm gases

Raws li Poisson tus qauv, cov roj sealing muaj feem xyuam rau cov roj molecule thiab roj viscosity. Lub to yog inversely proportional rau qhov ntev ntawm lub capillary thiab viscosity ntawm cov roj, thiab ncaj qha proportional rau txoj kab uas hla thiab tsav lub zog ntawm lub capillary. Thaum lub cheeb ntawm lub capillary yog tib yam li qhov nruab nrab ntawm kev ywj pheej ntawm cov roj molecule, cov roj molecule yuav ntws mus rau hauv lub capillary nrog dawb thermal motion. Yog li ntawd, thaum peb ua qhov kev ntsuam xyuas valve sealing, qhov nruab nrab yuav tsum tau siv dej los ua lub luag haujlwm ntawm kev sib khi, siv cua lossis roj tsis tuaj yeem ua lub luag haujlwm ntawm sealing. Txawm hais tias peb txo txoj kab uas hla ntawm lub capillary kom qis dua cov roj molecule los ntawm cov yas deformation, cov roj ntws tsis tuaj yeem nres. Yog vim li cas yog tias cov pa roj tseem tuaj yeem cuam tshuam los ntawm cov phab ntsa hlau. Yog li thaum peb ua qhov ntsuas roj, peb yuav tsum nruj dua li qhov ntsuas kua.

Sealing Principple of Leakage Channel

Lub valve foob muaj ob qhov chaw: qhov tsis sib xws ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov yoj thiab qhov waviness ntawm qhov kev ncua deb ntawm cov peaks. Nyob rau hauv cov xwm txheej uas lub zog elastic zog ntawm cov ntaub ntawv hlau feem ntau yog tsawg, yog tias peb xav kom ua tiav lub xeev kaw, peb yuav tsum tau muab cov kev xav tau siab dua rau cov khoom siv hlau compressive, uas yog, lub zog compressive ntawm cov ntaub ntawv yuav tsum tshaj nws. elasticity. Yog li ntawd, thaum tsim lub valve, lub sealing khub yog txuam nrog ib tug tej yam hardness txawv. Nyob rau hauv qhov kev txiav txim ntawm lub siab, nws yuav tsim ib tug tej yam degree ntawm yas deformation sealing nyhuv. Yog hais tias tag nrho cov sealing nto yog cov ntaub ntawv hlau, cov khoom tsis sib xws yuav tshwm sim ntxov tshaj plaws, thiab cov yas deformation ntawm cov khoom tsis sib xws tuaj yeem tsim tau pib nrog tsuas yog ib qho me me xwb. Thaum qhov kev sib cuag saum npoo nce, qhov roughness ntawm qhov chaw yuav dhau los ua cov yas-elastic deformation. Lub sijhawm no, qhov roughness ntawm ob sab hauv lub concave yuav tshwm sim. Nws yog ib qho tsim nyog yuav tsum tau siv lub nra hnyav uas tuaj yeem ua rau cov yas deformation loj ntawm cov khoom siv hauv qab thiab ua rau ob qhov chaw sib cuag. Tsuas yog raws txoj kab txuas mus ntxiv thiab cov kev taw qhia ib puag ncig tuaj yeem kaw cov kev txuas ntxiv no.

Valve Sealing Pair

Valve foob khub yog ib feem ntawm lub rooj zaum thiab kaw uas kaw nyob rau hauv kev sib cuag nrog ib leeg. Cov hlau sealing nto yog qhov yooj yim rau kev puas tsuaj ntawm clamping nruab nrab, nruab nrab corrosion, hnav hais, cavitation thiab yaig nyob rau hauv cov txheej txheem siv. Piv txwv li, hnav cov khoom. Yog tias qhov tsis sib xws ntawm cov khoom siv me me dua li ntawm qhov chaw, qhov tseeb ntawm qhov chaw yuav raug txhim kho yam tsis muaj kev puas tsuaj thaum lub sealing nto khiav hauv qhov tsis sib xws, qhov tseeb ntawm qhov chaw yuav raug deteriorated. Yog li ntawd, thaum xaiv cov khoom hnav, cov khoom siv, kev ua haujlwm, lubricity thiab corrosion ntawm sealing nto yuav tsum raug txiav txim siab. Zoo li hnav cov khoom, thaum peb xaiv cov ntsaws ruaj ruaj, peb yuav tsum xav txog txhua yam uas cuam tshuam rau lawv cov kev ua tau zoo, thiaj li ua si lub luag haujlwm tsis muaj pov thawj. Yog li ntawd, nws yog ib qho tsim nyog los xaiv cov khoom uas muaj corrosion resistant, khawb resistant thiab yaig resistant. Txwv tsis pub, yam tsis muaj qhov yuav tsum tau ua, lub sealing kev ua tau zoo yuav raug txo kom tsawg.

Muaj ntau ntau yam cuam tshuam rau valve sealing, feem ntau yog cov hauv qab no:

1.Sealing khub qauv

Nyob rau hauv qhov kev hloov ntawm qhov kub thiab txias los yog sealing quab yuam, tus qauv ntawm lub sealing khub yuav hloov. Thiab qhov kev hloov pauv no yuav cuam tshuam thiab hloov kev sib cuam tshuam ntawm kev sib khi ua ke, kom qhov kev ua haujlwm ntawm lub valve foob raug txo. Yog li ntawd, thaum xaiv cov ntsaws ruaj ruaj, nws yog ib qhov tsim nyog los xaiv cov ntsaws ruaj ruaj nrog elastic deformation. Nyob rau tib lub sijhawm, kev saib xyuas yuav tsum tau them rau qhov dav ntawm qhov sealing nto. Yog vim li cas yog qhov kev sib cuag ntawm lub sealing khub tsis tuaj yeem phim kiag li. Thaum qhov dav ntawm qhov sealing nto nce, lub zog xav tau rau kev sib khi yuav tsum tau nce ntxiv.

2.Specific siab ntawm sealing nto

Lub siab tshwj xeeb ntawm qhov sealing nto cuam tshuam rau kev ua haujlwm sealing thiab kev pabcuam lub neej ntawm lub valve. Yog li ntawd, qhov tshwj xeeb siab ntawm sealing nto kuj yog ib qho tseem ceeb heev. Nyob rau hauv tib yam kev mob, siab heev tshwj xeeb yuav ua rau lub valve puas, tab sis tsis tshua muaj siab wine yuav ua rau valve to. Yog li ntawd, peb yuav tsum tau xav txog qhov tsim nyog tshwj xeeb hauv kev tsim.

3. Lub cev muaj zog ntawm nruab nrab

Lub cev lub cev ntawm qhov nruab nrab kuj cuam tshuam rau kev sib khi ua haujlwm ntawm lub valve. Cov khoom ntawm lub cev muaj xws li kub, viscosity thiab hydrophilicity saum npoo. Kev hloov pauv kub tsis tsuas yog cuam tshuam rau kev so ntawm lub foob pob thiab kev hloov pauv ntawm qhov loj ntawm cov khoom, tab sis kuj muaj kev sib raug zoo nrog cov viscosity ntawm cov roj. Cov roj viscosity nce lossis txo nrog qhov nce lossis txo qhov kub. Yog li ntawd, txhawm rau txo qhov cuam tshuam ntawm qhov kub thiab txias ntawm qhov kev sib khi ntawm lub valve, peb yuav tsum tsim lub sealing khub ua lub rooj zaum elastic valve nrog thermal them nyiaj. Viscosity yog txuam nrog permeability ntawm cov kua. Nyob rau tib lub sijhawm, qhov ntau dua qhov viscosity, qhov me dua qhov permeability ntawm cov kua. Deg hydrophilicity yog hais txog kev tshem tawm ntawm ib zaj duab xis nyias ntawm cov hlau nto. Vim yog cov roj nyias zaj duab xis, qhov hydrophilicity ntawm qhov chaw yuav raug puas tsuaj, uas ua rau thaiv cov dej nkag.

4.Quality ntawm Sealing Pair

Foob khub zoo feem ntau yog hais txog kev xaiv cov khoom siv, kev sib txuam, kev tsim khoom raug kuaj xyuas. Piv txwv li, lub disc thiab lub rooj ntsaws ruaj ruaj yog nyob rau hauv kev pom zoo, uas tuaj yeem txhim kho lub sealability. Tus yam ntxwv ntawm ntau lub voj voog ncig yog nws txoj kev ua haujlwm zoo labyrinth sealing.

Valve leakage feem ntau tshwm sim hauv lub neej thiab kev tsim khoom, uas tuaj yeem ua rau khib nyiab lossis ua rau muaj kev phom sij rau lub neej, xws li kais dej valve to, uas tuaj yeem ua rau muaj qhov tshwm sim loj heev, xws li tshuaj lom, teeb meem, flammable, explosive thiab corrosive intermediary to to hauv tshuaj lom neeg kev lag luam. , thiab cov xwm txheej loj uas ua rau muaj kev nyab xeeb ntawm tus kheej, kev nyab xeeb ntawm vaj tse thiab ib puag ncig muaj kuab lom. Lub valve qhib thiab kaw los ntawm sab nraud rotating kis tau tus mob muaj ib tug sealing ntaus ntawv uas yog siv rau nruab ib tug tej yam xov tooj ntawm packing rings nyob rau hauv lub packing culvert kom tiav sealing nyhuv, tab sis yuav ua li cas txog lub sealing mob? Cov dej xau ntawm cov khoom ntim ntawm lub valve yog ib qho ntawm qhov tsis zoo tshaj plaws ntawm lub valve, tab sis muaj kwv yees li ob qho laj thawj.

Cov ntsaws ruaj ruaj kuj tseem yog cov khoom tseem ceeb hauv cov li qub. Lub sealing kev ua tau zoo ntawm lub valve yog hais txog lub peev xwm ntawm lub sealing qhov chaw ntawm lub valve los tiv thaiv qhov nruab nrab to. Nws yog qhov tseem ceeb tshaj plaws kev ua haujlwm Performance index ntawm lub valve.

Muaj peb qhov kev sib khi ntawm lub valve:

Kev sib cuag ntawm qhov qhib thiab kaw qhov chaw thiab ob qhov chaw sib khi ntawm lub rooj zaum valve; qhov haum ntawm qhov muab tub lim thiab qia thiab lub thawv ntim khoom; thiab kev sib txuas ntawm lub cev valve thiab lub valve npog. Cov dej xau yav dhau los yog hu ua internal leakage, uas feem ntau hu ua lax kaw. Nws yuav cuam tshuam rau lub peev xwm ntawm lub valve kom txiav tawm qhov nruab nrab. Internal to tsis tso cai rau truncation li qub. Leakage ntawm ob qhov chaw kawg yog hu ua to, piv txwv li nruab nrab los ntawm sab hauv mus rau sab nraud ntawm lub valve.

Cov dej xau tuaj yeem ua rau cov khoom poob, kev ua qias tuaj ib puag ncig, thiab muaj xwm txheej loj. Rau flammable, explosive, tshuaj lom los yog radioactive xov xwm, tsis tso cai, yog li lub valve yuav tsum muaj kev ruaj ntseg sealing kev ua tau zoo.

Yuav ua li cas los daws qhov teeb meem sealing tsis yog negligent, valve khiav, nce, drips, leaks, ntau npaum li tshwm sim ntawm no. Tom ntej no peb yuav tham txog qhov dynamic thiab zoo li qub sealing ntawm lub valve.

1.Dynamic foob

Valve dynamic foob, feem ntau yog hais txog qia foob. Khaws qhov nruab nrab hauv lub valve los ntawm kev xau nrog kev txav ntawm lub valve qia yog lub hauv paus ntsiab lus ntawm lub zog foob ntawm lub valve.

1) Packing daim ntawv

Valve dynamic foob, feem ntau ntim lub thawv. Daim ntawv tseem ceeb ntawm cov ntawv sau yog:

caj pas

Qhov no yog nyob rau hauv feem ntau.

Daim ntawv sib koom ua ke tuaj yeem paub qhov txawv ntau yam. Piv txwv li, nyob rau hauv cov nqe lus ntawm compression bolts, lawv tuaj yeem muab faib ua T-shaped bolts (rau cov valve uas muaj qhov siab tsawg dua 16 kg / square centimeter), ob-kawg bolts thiab nyob bolts, thiab lwm yam. muaj kev txhawj xeeb, nws tuaj yeem muab faib ua hom sib xyaw thiab sib xyaw ua ke.

Compression txiv ntoo hom

Hom valve no muaj qhov me me, tab sis nws lub zog compression yog txwv, yog li nws tsuas yog siv tau rau hauv cov li qub me me xwb.

2) packing

Nyob rau hauv lub thawv ntim khoom, cov khoom ntim tau raug hu ncaj qha nrog lub valve qia thiab ntim nrog lub thawv ntim kom tiv thaiv kom tsis txhob cuam tshuam ntawm qhov nruab nrab. Cov nram qab no yuav tsum tau rau fillers:

(1) Zoo sealing;

(2) corrosion kuj;

(3) Kev sib txhuam me me;

(4) Ua raws li qhov nruab nrab kub thiab siab.

2.Frequently siv fillers yog:

(1) Asbestos packing: Asbestos packing muaj cua sov zoo thiab corrosion kuj, tab sis thaum siv me me, cov nyhuv sealing tsis zoo thiab nws ib txwm impregnated los yog ntxiv nrog lwm cov ntaub ntawv. Roj-immersed asbestos packing: Muaj ob hom qauv qauv, ib qho yog twisting, lwm yam yog knitting. Nws tuaj yeem muab faib ua lub voj voog thiab square.

(2) Polytetrafluoroethylene braided packing: Lub braided PTFE ribbon muaj corrosion kuj zoo heev thiab yuav siv tau nyob rau hauv cryogenic media.

(3) Roj Hmab O-ring: Nyob rau hauv qis qis, cov nyhuv sealing zoo heev. Kev siv kub yog txwv, xws li cov roj hmab ntuj tsuas yog siv tau ntawm 60 C.

(4) Yas molding fillers: feem ntau ua rau peb-daim hom, tab sis kuj tuaj yeem ua rau lwm yam duab. Polytetrafluoroethylene (PTFE) yog cov yas siv ntau tshaj plaws.

Tsis tas li ntawd, piv txwv li, hauv 250 C chav li qub, thaum cov lauj kaub asbestos thiab cov hlau lead sib txuas ua ke, cov xau yuav raug txo; nrog li qub, qhov nruab nrab feem ntau hloov pauv. Yog tias asbestos pans thiab PTFE raw khoom siv siv ua ke, cov nyhuv sealing yuav zoo dua. Molybdenum disulfide (M0S2) los yog lwm yam lubricants tuaj yeem muab ntxiv rau hauv qhov chaw kom txo qis kev sib txhuam ntawm qia.

Cov neeg lim dej tshiab tab tom nrhiav. Piv txwv li, polyacrylonitrile fibers yog impregnated nrog polytetrafluoroethylene emulsion, thiab tom qab ntawd ua ntej oxidized, thiab sintered thiab nias rau hauv pwm, kom cov khoom ntim tuaj yeem tsim nrog kev sib khi zoo. Yog hais tias lub corrugated packing yog ua los ntawm stainless hlau ntawv thiab asbestos, nws muaj peev xwm tiv taus kub, siab kub thiab yaig.

3.Bllows foob

Nrog kev loj hlob sai ntawm kev lag luam tshuaj lom neeg thiab kev lag luam atomic zog thiab qhov nce ntawm qhov kub hnyiab, tawg, muaj kuab lom thiab cov khoom siv hluav taws xob ntau, cov kev xav tau nruj dua tau muab tso rau ntawm lub valve sealing. Hauv qee qhov chaw, kev siv lub tshuab nqus tsev tsis tuaj yeem siv tau, thiab daim ntawv sealing tshiab, lub tshuab sealing, tau tshwm sim. Hom foob no tsis xav tau muab tub lim, tseem hu ua non-filler seal.

Ob qhov kawg ntawm lub hauv siab yog welded rau lwm qhov chaw. Thaum lub valve qia nce thiab ntog, lub tshuab nqus tsev cog lus thiab lub tshuab nqus dej tsis xau, yog li qhov nruab nrab tsis tuaj yeem tawm. Rau lub hom phiaj ntawm kev nyab xeeb, muab ob npaug rau cov ntsaws ruaj ruaj ntawm lub tshuab nqus tsev thiab cov muab tub lim feem ntau siv.

Static seal feem ntau yog hais txog lub foob ntawm ob qhov chaw nyob ruaj khov. Lub ntsiab sealing txoj kev yog siv gaskets.

(1) Cov khoom siv tsis yog hlau:xws li ntawv, linen, cowhide, asbestos khoom, yas, roj hmab, thiab lwm yam.

Daim ntawv, linen, Kraft thiab lwm yam, nrog capillary qhov, yooj yim rau nkag mus, siv yuav tsum tau impregnated nrog roj, siv quav ciab los yog lwm yam ntaub ntawv impermeable. Valves feem ntau tsis tshua siv.

Asbestos khoom, asbestos siv, hlua, board thiab asbestos roj hmab board. Ntawm lawv, asbestos roj hmab ntawv muaj cov qauv compact, zoo siab tsis kam thiab kub tsis kam. Nws yog dav siv nyob rau hauv kev sib txuas ntawm valve nws tus kheej thiab flange ntawm valve thiab yeeb nkab.

Cov khoom siv yas muaj qhov zoo corrosion kuj thiab tau siv dav. Ntau yam muaj xws li polyethylene, polypropylene, mos polyvinyl chloride, polytetrafluoroethylene, nylon 66, nylon 1010, thiab lwm yam.

Cov khoom siv roj hmab, cov khoom muag muag, txhua yam ntawm Rubber Division muaj qee cov kua qaub, alkali, roj, dej hiav txwv tsis kam. Ntau yam muaj xws li cov roj hmab ntuj, styrene-butadiene roj hmab, nitrile-butadiene roj hmab, chloroprene roj hmab, isobutadiene roj hmab, polyurethane roj hmab, fluorine roj hmab, thiab lwm yam.

(2) Cov khoom siv hlau:Feem ntau hais lus, cov khoom siv hlau muaj lub zog siab thiab kub ua haujlwm. Tab sis hmoov txhuas tsis zoo li qhov no, tsuas yog vim nws tiv taus dilute sulfuric acid. Feem ntau siv ntau yam yog tooj dag, tooj liab, txhuas, qis carbon steel, stainless hlau, Monel alloy, nyiaj, npib tsib xee thiab lwm yam.

(3) Cov khoom siv sib xyaw:xws li hlau qhwv (sab hauv asbestos) gaskets, ua ke waveform gaskets, qhwv gaskets, thiab lwm yam.

Thaum siv li qub, qhov qub gasket feem ntau hloov pauv hauv cov xwm txheej tshwj xeeb. Feem ntau muaj cov gaskets: roj hmab ca gasket, roj hmab O-ring, yas ca gasket, PTFE qhwv gasket, asbestos roj hmab gasket, hlau ca gasket, hlau tshwj xeeb zoo li tus gasket, hlau qhwv gasket, wavy gasket, qhwv gasket thiab hais txog.

(1) Roj Hmab Gasket:yooj yim rau deform, tsis nyuaj rau nias, tab sis tsis zoo siab thiab kub tsis kam, tsuas yog rau cov tsis tshua muaj siab, tsis kub. Cov roj hmab ntuj muaj qee cov kua qaub thiab alkali tsis kam, kev siv kub yuav tsum tsis pub tshaj 60 C; chloroprene roj hmab kuj tuaj yeem tiv taus qee cov kua qaub thiab alkali, kev siv kub yog 80 C; butadiene nitrile roj hmab kuj siv tau rau 80 C; fluorine roj hmab muaj qhov zoo corrosion kuj, kub kuj zoo dua li cov roj hmab zoo tib yam, tuaj yeem siv rau hauv 150 C nruab nrab.

(2) Roj Hmab O-washer:Tus ntoo khaub lig-sectional duab yog puag ncig, thiab muaj qee yam ntawm tus kheej-tightening nyhuv. Cov nyhuv sealing zoo dua li ntawm lub tshuab ntxhua khaub ncaws, thiab lub zog nruj me dua.

(3) Yas tiaj tus gasket:Cov yam ntxwv tseem ceeb tshaj plaws ntawm cov yas yog zoo corrosion kuj, thiab cov yas feem ntau muaj qhov kub tsis zoo. Polytetrafluoroethylene (PTFE) yog cov yas yas. Nws muaj zoo heev corrosion kuj thiab dav kub ntau yam. Nws tuaj yeem siv tau ntev hauv thaj tsam ntawm - 180 ~ 200 ~ C.

(4) Polytetrafluoroethylene (PTFE) qhwv gaskets:txhawm rau txhim kho thiab nthuav dav qhov zoo ntawm PTFE, thaum ua rau nws qhov tsis zoo elasticity yuam kev, ua PTFE qhwv roj hmab lossis asbestos roj hmab gaskets. Nyob rau hauv txoj kev no, nws tsis tsuas yog muaj tib lub corrosion kuj zoo li PTFE ca gasket, tab sis kuj muaj elasticity zoo heev, txhim khu kev sib khi nyhuv thiab txo cov compressive quab yuam.

(5) Asbestos roj hmab gasket:txiav los ntawm asbestos roj hmab ntawv. Nws cov khoom yog 60-80% asbestos thiab 10-20% roj hmab, nrog rau cov muab tub lim thiab vulcanizers. Nws muaj cov cua kub zoo, tiv thaiv txias, tshuaj lom neeg ruaj khov, khoom siv ntau, tus nqi qis. Thaum siv, lub zog compression tsis tas yuav loj heev. Nws tuaj yeem ua raws li cov hlau, nyiam dua coated nrog graphite hmoov, kom tsis txhob muaj qhov nyuaj ntawm disassembly.

(6) Hlau tiaj tiaj-kub nplhaib:txhuas, kub tsis kam 100 C; aluminium 430 C; tooj 315 C; qis carbon steel 550 C; nyiaj 650 C; npib tsib xee 810c; Monel (nickel-tooj ​​liab) alloy 810 C, stainless hlau 870 C. Ntawm lawv, cov hlau lead muaj qhov tsis zoo siab, aluminium tuaj yeem tiv taus 64 kg / cm², thiab lwm yam ntaub ntawv tuaj yeem tiv taus siab.

(7) Hlau heterosexual gaskets:

Lens washer: nws tus kheej nruj, siv nyob rau hauv high-pressure li qub.

Elliptical washer: kuj belongs rau high-pressure self-tightening washer.

Conical ob chav gaskets: Siv rau nws tus kheej ceev faj sealing hauv siab.

Tsis tas li ntawd, muaj cov square, pob zeb diamond, daim duab peb sab, hniav, nqos tail, B, C, thiab lwm yam., feem ntau tsuas yog siv rau hauv siab thiab nruab nrab siab li qub.

(8) Hlau wrapping gasket:Hlau muaj qhov kub thiab txias ua haujlwm, nrog rau elasticity zoo heev. Cov ntaub ntawv qhwv yog aluminium, tooj liab, qis carbon steel, stainless hlau, Monel alloy, thiab lwm yam. Nws yog ntim nrog asbestos, polytetrafluoroethylene, iav fiber ntau thiab lwm yam.

(9) Waveform gasket:Nws muaj cov yam ntxwv ntawm me me compaction quab yuam thiab zoo sealing nyhuv. Kev sib xyaw ntawm cov hlau thiab tsis yog hlau feem ntau yog siv.

(10) Lub tog raj kheej gasket:Nws yog ib txoj hlua hlau nyias nyias thiab tsis yog hlau siv ua ke, qhwv ib ncig ntawm ntau txheej ncig, wavy cross-section, muaj elasticity zoo thiab sealing. Cov hlau strips tuaj yeem tsim nrog 08 steel, 0Cr13, 1Cr13, 2Cr13, 1Cr18Ni9Ti, tooj liab, aluminium, titanium thiab Monel alloys. Cov ntaub ntawv tsis yog xim hlau muaj xws li asbestos, polytetrafluoroethylene thiab lwm yam.

Saum toj no, qee cov duab tau teev thaum piav qhia txog kev ua haujlwm ntawm sealing gaskets. Nws yuav tsum tau muab sau tseg tias cov nuj nqis no muaj feem xyuam nrog flange daim ntawv, nruab nrab mob thiab installation technology. Lawv tuaj yeem yog leapfrogging, tsis tuaj yeem ncav cuag, siab thiab kub tsis kam, thiab kuj tuaj yeem hloov mus rau ib leeg. Piv txwv li, thaum kub siab, lub siab tsis kam feem ntau txo. Cov teeb meem hloov maj mam tsuas tuaj yeem txaus siab rau hauv kev xyaum.

Valve sealing cov khoom yog ib feem tseem ceeb ntawm valve sealing, uas ua raws li kev sib cuag ncaj qha ntawm lub valve sealing. Dab tsi yog cov khoom sealing rau li qub? Peb paub tias muaj ob hom kev sib khi cov khoom siv rau cov li qub: hlau thiab tsis yog hlau.

Valve sealing cov khoom yog ib feem tseem ceeb ntawm valve sealing, uas ua raws li kev sib cuag ncaj qha ntawm lub valve sealing. Dab tsi yog cov khoom sealing rau li qub? Peb paub tias muaj ob hom kev sib khi cov khoom siv rau cov li qub: hlau thiab tsis yog hlau. Ntawm no yog ib qho kev qhia luv luv rau kev siv ntau yam khoom sib khi, nrog rau cov hom valve feem ntau siv.

1. Synthetic roj hmab

Cov khoom zoo ntawm cov roj hmab hluavtaws, xws li roj tsis kam, kub tsis kam thiab corrosion kuj, yog superior rau cov roj hmab ntuj. Feem ntau, kev siv kub ntawm cov roj hmab hluavtaws tsawg dua 150 C, thiab cov roj hmab ntuj yog tsawg dua 60 C. Roj hmab yog siv rau kev sib khi li qub xws li lub ntiaj teb li qub, lub rooj vag li qub, diaphragm li qub, npauj npaim li qub, kos li qub thiab pinch li qub. nrog nominal siab PN tsawg dua 1 MPa.

2. Nylon

Nylon muaj cov yam ntxwv ntawm kev sib txhuam coefficient thiab zoo corrosion kuj. Nylon feem ntau yog siv rau hauv pob li qub thiab lub ntiaj teb li qub nrog kub T < 90 C, nominal siab PN < 32 MPa, thiab lwm yam.

3.Teflon

Polytetrafluoroethylene (PTFE) feem ntau yog siv rau hauv lub ntiaj teb li qub, rooj vag li qub thiab pob li qub nrog kub T < 232 C thiab nominal siab PN < 6.4 MPa.

4. Cam khwb cia hlau

Cam khwb cia hlau yog siv rau lub rooj vag li qub, lub ntiaj teb li qub, ntsaws li qub rau roj thiab roj, thiab lwm yam nrog kub T <100 C, nominal siab PN <1.6MPa.

5.Babbitt alloy

Babbitt alloy yog siv rau ammonia shutoff li qub nrog kub t -70 ~ 150 C thiab nominal siab PN < 2.5 MPa.

6. Copper alloy

Cov khoom siv ntawm tooj liab alloys yog 6-6-3 tin bronze thiab 58-2-2 manganese tooj dag. Copper alloy muaj zoo hnav tsis kam. Nws yog haum rau dej thiab chav nrog kub T <200 C thiab nominal siab PN <1.6 MPa. Nws feem ntau yog siv rau hauv lub rooj vag li qub, lub ntiaj teb li qub, kos li qub, lub pob valve, thiab lwm yam.

7.Chromium stainless hlau

Feem ntau siv qib ntawm chromium stainless hlau yog 2Cr13 thiab 3Cr13, uas muaj corrosion kuj zoo tom qab quenching thiab tempering. Feem ntau siv rau hauv dej, chav thiab roj av li qub nrog kub T <450 C thiab nominal siab PN <32MPa.

8.Chromium-nickel-titanium stainless hlau

Chromium-nickel-titanium stainless hlau feem ntau siv hom yog 1Cr18Ni9ti, uas muaj corrosion kuj zoo, yaig tsis kam thiab kub tsis kam. Nws yog haum rau chav, nitric acid thiab lwm yam xov xwm nrog kub T < 600 C thiab nominal siab PN < 6.4 MPa. Nws yog siv rau lub ntiaj teb li qub, pob li qub, thiab lwm yam.

9.Nitriding hlau

Lub hom phiaj ntawm nitriding steel yog 38CrMoAlA, uas muaj kev tiv thaiv corrosion zoo thiab kev puas tsuaj tom qab kev kho mob carburizing. Nws yog feem ntau siv nyob rau hauv lub hwj chim chaw nres tsheb qhov rooj li qub nrog kub T <540 C thiab nominal siab PN <10MPa.

10.Boronizing

Boronizing yog ua tiav ncaj qha los ntawm lub cev lub cev lossis cov khoom siv hauv lub cev, thiab tom qab ntawd boronized nto kho. Lub sealing nto muaj qhov hnav tsis zoo. Siv rau dej phwj valve ntawm chaw nres tsheb fais fab.

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