Sab hauv thiab sab nraud to
Muaj peb qhov kev sib khi ntawm lub valve: (1) Kev sib cuag ntawm qhov qhib thiab kaw qhov chaw thiab ob qhov sib khi ntawm lub rooj zaum valve; (2) Qhov haum ntawm cov ntim khoom, lub qia valve thiab lub thawv ntim khoom; (3) Kev sib txuas ntawm lub valve lub cev thiab lub valve npog. Thawj leakage yog hu ua internal to, uas feem ntau hu ua lax sealing. Nws yuav cuam tshuam rau lub valve lub peev xwm txiav tawm qhov nruab nrab. Rau kev txiav tawm li qub, tsis tso cai rau sab hauv. Ob qho kev xau tom kawg yog hu ua sab nraud to, uas yog, qhov nruab nrab ntws los ntawm sab hauv lub valve mus rau sab nraud lub valve. Cov dej xau yuav ua rau cov khoom poob, ua paug rau ib puag ncig, thiab tseem ua rau muaj xwm txheej hnyav. 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.
- Dynamic foob
Valve dynamic foob feem ntau yog hais txog valve qia foob. Tiv thaiv qhov nruab nrab hauv lub valve los ntawm kev xau nrog kev txav ntawm lub valve qia yog qhov teeb meem tseem ceeb ntawm valve dynamic sealing.
- Sau daim ntawv
Lub dynamic foob ntawm lub valve feem ntau yog lub thawv ntim khoom. Daim ntawv tseem ceeb ntawm tsab ntawv sau yog:
(1) Hom kab mob
Nov yog daim ntawv siv ntau tshaj plaws. Muaj ntau cov ncauj lus kom ntxaws sib txawv hauv daim ntawv sib koom ua ke. Piv txwv li, los ntawm qhov kev xav ntawm compression bolts, lawv tuaj yeem muab faib ua T-shaped bolts (rau cov valve uas tsis tshua muaj siab nrog lub siab tsawg dua lossis sib npaug li 16 kg / cm²), stud bolts, thiab articulated bolts. Los ntawm qhov kev xav ntawm caj pas, nws tuaj yeem muab faib ua ib hom thiab hom sib xyaw.
(2) Compression txiv ntoo hom
Hom valve no muaj qhov me me tab sis txwv tsis pub muaj zog, yog li nws tsuas yog siv rau cov li qub me me xwb.
- Sau
Nyob rau hauv lub thawv ntim khoom, lub thawv ntim khoom yog nyob rau hauv kev sib cuag ncaj qha nrog lub valve qia thiab ntim nrog lub thawv ntim khoom kom tiv thaiv qhov nruab nrab los ntawm kev xau tawm. Muaj cov kev xav tau hauv qab no rau fillers:
(1) Zoo sealing;
(2) Corrosion kuj;
(3) Kev sib txhuam me me;
(4) Ua raws li qhov nruab nrab kub thiab siab.
- Feem ntau siv cov fillers muaj xws li:
(1) Asbestos packing: Asbestos packing muaj kub zoo thiab corrosion kuj, tab sis thaum siv ib leeg, cov nyhuv sealing tsis zoo, thiab nws yog ib txwm impregnated los yog txuas nrog lwm cov ntaub ntawv. Roj-impregnated asbestos packing: Nws muaj ob hom qauv qauv, ib qho yog twisted thiab lwm yam yog braided. Nws tuaj yeem muab faib ua puag ncig thiab square.
(2) PTFE braided packing: PTFE nyias strips yog woven rau hauv packing, uas muaj zoo corrosion kuj thiab yuav siv tau nyob rau hauv cryogenic media.
(3) Roj Hmab O-ring: Cov nyhuv sealing zoo nyob rau hauv qis qis. Kev siv kub yog txwv, piv txwv li, cov roj hmab ntuj tsuas yog siv tau ntawm 60 degree.
(4) Yas molding muab tub lim: Feem ntau ua rau peb daim, nws tuaj yeem ua rau lwm yam duab. Feem ntau ntawm cov yas siv yog polytetrafluoroethylene.
Tsis tas li ntawd, piv txwv li, nyob rau hauv 250 degree chav valve, asbestos packing thiab lead rings yog alternated superimposed, thiab cov pa xau yuav raug txo; nrog li qub, qhov nruab nrab feem ntau hloov pauv, xws li siv asbestos packing thiab polytetrafluoroethylene raw khoom daim kab xev ua ke. , cov nyhuv sealing yuav zoo dua. Txhawm rau txo kev sib txhuam ntawm lub qia valve, molybdenum disulfide (MoS2) lossis lwm yam roj nplua nyeem tuaj yeem muab ntxiv rau qee qhov chaw.
Qee qhov tshiab fillers kuj tau tshawb nrhiav tas li. Piv txwv li, polyacrylonitrile fiber yog impregnated nrog polytetrafluoroethylene emulsion thiab pre-oxidized ua ntej sintered thiab nias rau hauv pwm kom tau ib tug molded muab tub lim nrog zoo sealing kev kawm; Lwm qhov piv txwv yog corrugated muab tub lim ua los ntawm stainless hlau los xij thiab asbestos, uas tuaj yeem tiv taus qhov kub thiab txias. thiab yaig.
- Bellows foob
Kev loj hlob sai ntawm kev lag luam tshuaj thiab kev lag luam atomic zog, thiab kev nce hauv cov nplaim taws, tawg, muaj kuab lom thiab cov khoom siv hluav taws xob ntau, muaj cov kev cai nruj dua rau cov ntsaws ruaj ruaj valve. Cov ntsaws ruaj ruaj tsis tuaj yeem siv rau hauv qee qhov chaw, thiab daim ntawv sealing tshiab - lub foob foob tau tshwm sim. Hom foob no tsis xav tau cov khoom ntim, tseem hu ua cov ntsaws ruaj ruaj-dawb.
Qhov nruab nrab kawg ntawm cov yeeb nkab corrugated yog welded rau lwm qhov chaw. Thaum lub valve qia nce thiab ntog, lub hauv caug nthuav dav thiab sib cog lus. Yog tias lub hauv paus nws tus kheej tsis xau, qhov nruab nrab tsis tuaj yeem xau. Rau kev nyab xeeb vim li cas, muab ob npaug rau sealing nrog rau hauv qab thiab ntim khoom feem ntau siv.