1. General
Hom valve no yog tsim los ua ib qho kev qhib-thiab-kaw kev teeb tsa kom ua haujlwm kom zoo siv hauv cov kav dej hauv kev lag luam.
2. Cov khoom piav qhia
2.1 Technical yuav tsum tau
2.1.1 Tsim thiab Tsim Qauv: API 600, API 602
2.1.2 Connection Dimension Standard: ASME B16.5 thiab lwm yam
2.1.3 Lub ntsej muag rau ntsej muag Dimension Standard: ASME B16.10
2.1.4 Kev Tshawb Fawb thiab Kev Ntsuas: API 598 thiab lwm yam
2.1.5 Loj: DN10 ~ 1200, Siab: 1.0 ~ 42MPa
2.2 Lub valve no yog nruab nrog flange kev twb kev txuas, BW kev twb kev txuas phau ntawv ua haujlwm casting rooj vag li qub. Lub qia txav mus rau hauv txoj kab ntsug. Lub rooj vag disc kaw lub raj xa dej thaum lub sijhawm clockwise ncig ntawm tes log. Lub rooj vag disc qhib lub raj xa dej thaum lub sijhawm rov ua haujlwm ntawm lub log ntawm tes.
2.3 Thov siv tus qauv ntawm cov duab hauv qab no
2.4 Cov khoom tseem ceeb thiab cov khoom siv
| NPE | KHOOM |
| Lub cev / Bonnet | WCB, LCB, WC6, WC9, CF3, CF3M CF8, CF8M |
| Rooj vag | WCB, LCB, WC6, WC9, CF3, CF3M CF8, CF8M |
| Rooj | A105, LF2, F11, F22, F304 (304L), F316 (316L) |
| Qe | F304 (304L), F316 (316L), 2Cr13, 1Cr13 |
| Ntim | Braided graphite & Flexible graphite & PTFE thiab lwm yam |
| Bolt/Nut | 35/25, 35CrMoA/45 |
| Gasket | 304 (316) + Graphite / 304 (316) + Gasket |
| RoojNplhaib/Disc/Kev sib khi | 13Cr, 18Cr-8Ni, 18Cr-8Ni-Mo, PP, PTFE, STL thiab lwm yam |
3. Cia & Kho & Txhim Kho & Ua Haujlwm
3.1 Cia & Kho
3.1.1 Valves yuav tsum muab cia rau hauv qhov chaw sab hauv. Cov kab noj hniav kawg yuav tsum tau them nrog plug.
3.1.2 Kev tshuaj xyuas ib ntus thiab tshem tawm yuav tsum tau khaws cia ntev li qub, tshwj xeeb tshaj yog rau kev sib khi ntawm qhov chaw tu. Tsis pub muaj kev puas tsuaj. Roj txheej yog thov kom tsis txhob xeb rau machining nto.
3.1.3 Hais txog lub valve cia ntau tshaj 18 lub hlis, kev ntsuam xyuas yuav tsum tau ua ua ntej valve installation thiab sau cov txiaj ntsig.
3.1.4 Valves yuav tsum tau kuaj xyuas ib ntus thiab tswj xyuas tom qab kev teeb tsa. Cov ntsiab lus tseem ceeb yog raws li hauv qab no:
1) Sealing nto
2) Qe thiab qia txiv ntoo
3) Ntim
4) Sab hauv qhov chaw tu lub cev thiab lub kaus mom.
3.2 Kev teeb tsa
3.2.1 Recheck lub valve markings (Hom, DN, Rating, Material) uas ua raws li cov cim tau thov los ntawm cov kav dej.
3.2.2 Ua kom tiav kev tu cov kab noj hniav thiab qhov chaw sib khi yog thov ua ntej kev teeb tsa valve.
3.2.3 Xyuas kom cov bolts nruj ua ntej kev teeb tsa.
3.2.4 Xyuas kom cov ntim khoom nruj ua ntej kev teeb tsa. Txawm li cas los xij, nws yuav tsum tsis txhob cuam tshuam qia txav.
3.2.5 Valve qhov chaw yuav tsum yooj yim rau kev tshuaj xyuas thiab ua haujlwm. Kab rov tav rau pipeline yog nyiam. Khaws tes log nce thiab kav ntsug.
3.2.6 Rau lub kaw-off valve, nws tsis tsim nyog yuav tsum tau ntsia nyob rau hauv lub siab ua hauj lwm mob. Cov qia yuav tsum zam kom tsis txhob puas.
3.2.7 Rau qhov (socket) vuam valve, yuav tsum tau saib xyuas thaum lub sij hawm sib txuas valve raws li hauv qab no:
1) Welder yuav tsum tau ntawv pov thawj.
2) Vuam txheej txheem parameter yuav tsum ua raws li cov txheeb ze vuam cov ntaub ntawv pov thawj zoo.
3) Cov khoom siv ntawm cov vuam kab, cov tshuaj lom neeg thiab kev ua haujlwm ua ke nrog kev tiv thaiv corrosion yuav tsum zoo ib yam li cov khoom niam txiv lub cev.
3.2.8 Valve installation yuav tsum tsis txhob muaj kev kub siab los ntawm kev txuas lossis cov kav dej.
3.2.9 Tom qab kev teeb tsa, cov li qub yuav tsum qhib thaum lub sij hawm ntsuas cov kav dej.
3.2.10 Support Point: yog tias cov yeeb nkab muaj zog txaus los txhawb lub qhov hnyav thiab lub zog ua haujlwm, qhov kev txhawb nqa tsis tau thov. Txwv tsis pub nws yuav tsum tau.
3.2.11 Lifting: Tes log lifting tsis pub rau li qub.
3.3 Kev ua haujlwm thiab kev siv
3.3.1 Lub rooj vag li qub yuav tsum qhib tag nrho lossis kaw thaum siv kom tsis txhob muaj lub nplhaib sib khi thiab disc nto tshwm sim los ntawm kev kub ceev nruab nrab. Lawv tsis tuaj yeem raug foob rau kev khiav dej num.
3.3.2 Tes log yuav tsum tau siv los hloov lwm yam twj paj nruag los qhib lossis kaw li qub
3.3.3 Thaum lub sij hawm tso cai rau qhov kev pab cuam kub, instantaneous siab yuav tsum qis tshaj qhov ntsuas siab raws li ASME B16.34
3.3.4 Tsis muaj kev puas tsuaj lossis kev tawm tsam raug tso cai thaum lub caij tsheb thauj mus los, kev teeb tsa thiab kev ua haujlwm.
3.3.5 Kev ntsuas ntsuas los xyuas qhov tsis ruaj khov yog thov los tswj thiab tshem tawm qhov decomposition yam kom tsis txhob muaj kev puas tsuaj valve thiab to.
3.3.6 Cov kua dej txias yuav cuam tshuam rau kev ua haujlwm ntawm lub valve, thiab ntsuas cov cuab yeej yuav tsum tau siv los txo qhov kub thiab txias los yog hloov lub valve.
3.3.7 Rau nws tus kheej-inflammable kua, siv cov cuab yeej ntsuas tsim nyog los lav ambient thiab ua hauj lwm siab tsis tshaj nws pib-ignition point (tshwj xeeb tshaj yog ceeb toom tshav ntuj los yog sab nraud hluav taws).
3.3.8 Nyob rau hauv cov ntaub ntawv ntawm cov dej txaus ntshai, xws li tawg, o, toxicity, oxidation khoom, nws yog txwv tsis pub hloov packing nyob rau hauv siab. Txawm li cas los xij, thaum muaj xwm txheej ceev, nws tsis pom zoo kom hloov cov ntim hauv qab siab (txawm tias lub valve muaj qhov ua haujlwm zoo li no).
3.3.9 Xyuas kom cov kua dej tsis qias neeg, uas cuam tshuam rau kev ua haujlwm ntawm lub valve, tsis suav nrog cov khib nyiab nyuaj, txwv tsis pub cov cuab yeej ntsuas tsim nyog yuav tsum tau siv los tshem tawm cov av thiab cov khib nyiab nyuaj, lossis hloov nrog lwm hom valve.
3.3.10 Siv tau ua haujlwm kub
| Khoom siv | Kub | Khoom siv | Kub |
| WCB | -29 ~ 425 ℃ | WC 6 | -29 ~ 538 ℃ |
| LCB | -46 ~ 343 ℃ | WC 9 | -29 ~ 570 ℃ |
| CF3 (CF3M) | -196 ~ 454 ℃ | CF8 (CF8M) | -196 ~ 454 ℃ |
3.3.11 Xyuas kom tseeb tias cov khoom ntawm lub cev valve yog tsim rau siv nyob rau hauv corrosion resistant thiab xeb tiv thaiv ib puag ncig kua.
3.3.12 Thaum lub sijhawm ua haujlwm, tshawb xyuas kev sib khi ua haujlwm raws li cov lus hauv qab no:
| Qhov chaw soj ntsuam | Leak |
| Kev sib txuas ntawm lub cev valve thiab lub valve bonnet | Zero |
| Packing foob | Zero |
| Valve lub rooj zaum | Raws li kev specifications |
3.3.13 Tsis tu ncua xyuas qhov hnav ntawm lub rooj zaum, ntim cov laus thiab kev puas tsuaj.
3.3.14 Tom qab kho, rov sib dhos thiab kho lub valve, tom qab ntawd sim ua kom nruj thiab ua cov ntaub ntawv.
4. Cov teeb meem tshwm sim, ua rau thiab kev ntsuas kho
| Teeb meem piav qhia | Ua tau | Kev ntsuas kho |
| Leak ntawm packing | Tsis txaus compressed packing | Re-tighten packing nut |
| Kev ntim khoom tsis txaus | Ntxiv cov khoom ntim ntxiv | |
| Kev ntim khoom puas vim yog kev pabcuam ntev lossis kev tiv thaiv tsis raug | Hloov ntim | |
| Leak ntawm lub rooj zaum lub ntsej muag | Lub ntsej muag qias neeg | Tshem tawm cov av |
| Hnav lub ntsej muag | Kho nws los yog hloov lub nplhaib lub rooj zaum lossis lub phaj valve | |
| Lub ntsej muag puas tsuaj vim yog cov khoom tawv tawv | Tshem tawm cov khoom tawv tawv hauv cov kua dej, hloov lub nplhaib lub nplhaib lossis lub phaj valve, lossis hloov nrog lwm hom valve | |
| Los ntawm kev sib txuas ntawm lub cev valve thiab lub valve bonnet | Bolts tsis zoo fastened | Uniformly fasten bolts |
| Kev puas tsuaj bonnet sealing lub ntsej muag ntawm lub cev valve thiab valve flange | Kho nws | |
| Gasket puas los yog tawg | Hloov gasket | |
| Kev sib hloov nyuaj ntawm tes log lossis valve phaj tsis tuaj yeem qhib lossis kaw. | Tightly fastened packing | Tsim nyog loosen packing txiv ntoo |
| Deformation los yog khoov ntawm lub caj pas sealing | Kho lub caj pas sealing | |
| Kev puas tsuaj valve qia txiv ntoo | Kho cov xov thiab tshem tawm cov qias neeg | |
| Hnav los yog tawg valve qia txiv ntoo xov | Hloov valve qia txiv ntoo | |
| Bent valve qia | Hloov valve qia | |
| Daim ntawv qhia qias neeg ntawm lub valve phaj lossis lub cev valve | Tshem tawm cov av ntawm qhov chaw qhia |
Nco tseg: Tus neeg pabcuam yuav tsum muaj kev paub txog thiab kev paub txog li qub Dej sealing gate valve
Lub kaus mom packing yog dej sealing qauv, nws yuav raug cais tawm ntawm huab cua thaum lub siab dej mus txog rau 0.6 ~ 1.0MP kom lav zoo huab cua sealing kev ua tau zoo.
5. Warranty:
Tom qab lub valve tau muab tso rau hauv kev siv, lub sijhawm lav ntawm lub valve yog 12 lub hlis, tab sis tsis pub tshaj 18 lub hlis tom qab hnub xa khoom. Thaum lub sijhawm lav, cov chaw tsim khoom yuav muab kev pabcuam kho lossis cov khoom seem dawb rau kev puas tsuaj vim yog cov khoom siv, kev ua haujlwm lossis kev puas tsuaj yog tias kev ua haujlwm raug raug.
Post lub sij hawm: Nov-10-2020