Kev nyab xeeb valve installation cov lus qhia thiab ceev faj tsom xam Kev nyab xeeb valve qhov tseem ceeb siab piv txoj kev kawm - Lecco li qub

Kev nyab xeeb valve installation cov lus qhia thiab ceev faj tsom xam Kev nyab xeeb valve qhov tseem ceeb siab piv txoj kev kawm - Lecco li qub

Kev nyab xeeb valve installation cov lus qhia
Hauv kev tsim cov nroj tsuag petrochemical, raws li tus naj npawb ntawm nruab nrab thiab siab siab theem ntawm cov cuab yeej thiab cov kav dej muaj feem cuam tshuam rau qhov nce, kev siv cov kev nyab xeeb li qub tau nce raws li. Yog li ntawd, kev ruaj ntseg valve raug, tsim nyog layout yog ib qho tseem ceeb tshwj xeeb.
1. Lub valve kev nyab xeeb ntawm cov khoom siv lossis cov kav dej yuav tsum tau muab tso rau ntsug thiab ze li sai tau rau cov khoom tiv thaiv lossis cov kav dej. Txawm li cas los xij, kev ruaj ntseg valve ntawm cov kua kav dej, cov khoom siv hluav taws xob los yog lub thawv, thaum lub valve raug kaw, lub siab yuav nce siab vim thermal expansion, tuaj yeem ntsia tau kab rov tav.
2, lub valve kev nyab xeeb feem ntau yuav tsum tau nruab rau hauv qhov chaw uas nws yooj yim los kho thiab kho, thiab yuav tsum muaj chaw ua haujlwm txaus nyob ib puag ncig nws. Xws li: ntsug thawv kev ruaj ntseg valve, DN80 hauv qab no, tuaj yeem ntsia tau rau sab nraud ntawm lub platform; DN100 yog ntsia sab nraum lub platform ze ntawm lub platform, nrog kev pab ntawm lub platform tuaj yeem siv los kho thiab kho lub valve. Thiab yuav tsum tsis txhob muab ntsia rau ntawm qhov kawg ntawm cov kav ntev kab rov tav kom tsis txhob muaj cov khib nyiab los yog kua.
3. Qhov kev ruaj ntseg valve ntsia rau ntawm lub raj xa dej yuav tsum nyob rau hauv qhov chaw uas lub siab ruaj khov thiab muaj qee qhov kev ncua deb ntawm qhov hloov pauv.
4, kev nyab xeeb valve rau qhov chaw, rau qhov nruab nrab tsis muaj teeb meem (xws li huab cua, thiab lwm yam) tso tawm cov yeeb nkab lub qhov ncauj yog siab tshaj qhov chaw nres nkoj tawm raws li qhov nruab nrab ntawm 715m vojvoog ntawm kev khiav hauj lwm platform, khoom siv lossis hauv av 2.5m saum toj no. Rau corrosive, flammable lossis toxic media, qhov tawm qhov hluav taws xob yuav tsum siab tshaj 3m siab tshaj qhov kev khiav hauj lwm platform, khoom siv los yog hauv av nyob rau hauv 15m vojvoog.
5, lub qhov hluav taws xob kev nyab xeeb yog txuas nrog lub siab nyem cov yeeb nkab, yuav tsum tau muab tso rau hauv cov yeeb nkab los ntawm sab saud mus rau 45 Lub kaum ntse ntse, kom tsis txhob nchuav cov condensate rau hauv ceg yeeb nkab, thiab tuaj yeem txo qhov siab ntawm kev nyab xeeb. valve. Thaum lub siab tsis tu ncua ntawm qhov kev nyab xeeb valve siab dua 710MPa, ntxig 45 yuav tsum tau siv.
6. Yuav tsum tsis muaj lub hnab zoo li cov kua hauv cov yeeb nkab tawm ntawm cov roj ntub dej siab nyem qhov system, thiab qhov siab ntawm qhov kev nyab xeeb ntawm lub valve yuav tsum siab dua li ntawm lub siab nyem. Yog tias lub qhov hluav taws xob ntawm lub qhov hluav taws xob qis qis dua lub siab nyem lub ntsiab kab lossis cov yeeb nkab tso tawm yuav tsum tau tsa kom nkag mus rau cov kab tseem ceeb, lub tank tso kua dej thiab qib ntsuas los yog phau ntawv ua kua tso tawm valve yuav tsum tau teeb tsa ntawm qhov qis thiab yooj yim. nkag mus rau qhov chaw, thiab tsis tu ncua tso tawm mus rau lub kaw lus kaw kom tsis txhob muaj cov kua hauv lub hnab ntim cov yeeb nkab seem. Tsis tas li ntawd, nyob rau hauv cov cheeb tsam txias, lub hnab yeeb nkab seem xav tau cov cua sov kom tsis txhob khov. Lub chav tracing tube kuj tuaj yeem vaporize cov condensate hauv lub hnab ntim kom tsis txhob muaj cov kua sib xyaw. Tab sis txawm hais tias siv cov cua kub tracing tube, phau ntawv ntws valve tseem tsim nyog.
7, kev ruaj ntseg valve qhov hluav taws xob cov yeeb nkab tsim yuav tsum xav txog qhov rov qab siab tsis tshaj ib qho nqi ntawm qhov kev ruaj ntseg valve. Rau lub caij nplooj ntoos hlav hom kev nyab xeeb valve, hom dav dav ntawm lub nraub qaum yuav tsum tsis pub tshaj 10% ntawm qhov ntsuas siab ntawm lub valve, hom twj tso kua mis (hom sib npaug) lub nraub qaum siab yuav tsum tsis pub tshaj 30% ntawm lub siab ntawm lub valve, rau kev tsav tsheb. hom kev ruaj ntseg valve, lub siab rov qab tsis tshaj 60% ntawm qhov kev ruaj ntseg valve. Tus nqi tshwj xeeb yuav tsum xa mus rau cov chaw tsim khoom tus qauv thiab txiav txim siab los ntawm cov txheej txheem suav.
8, vim hais tias cov pa roj los yog cov pa tawm mus rau hauv qhov chaw los ntawm lub qhov hluav taws xob kev nyab xeeb, lub zog tawm tsam yog tsim los ntawm cov kab nruab nrab ntawm lub qhov hluav taws xob cov yeeb nkab, uas yog hu ua cov tshuaj tiv thaiv kev nyab xeeb valve. Kev cuam tshuam ntawm qhov quab yuam no yuav tsum tau xav txog hauv kev tsim cov kab hluav taws xob ntawm lub valve nyem. Xws li: kev ruaj ntseg valve qhov hluav taws xob yeeb nkab yuav tsum tau muab kev txhawb nqa ruaj khov; Thaum lub inlet yeeb nkab seem ntawm nyem valve yog ntev, lub siab hlab ntsha phab ntsa yuav tsum tau ntxiv dag zog.
Kev ruaj ntseg valve ua haujlwm ceev faj
1. Kev ruaj ntseg valve siv lub tuam tsev yuav tsum tau qhia meej txog cov kev cai hauv qab no rau kev ruaj ntseg valve hauv cov txheej txheem thiab cov kev cai tom qab ua haujlwm:
1. Cov txheej txheem kev ua haujlwm (nrog rau kev ua haujlwm siab, ua haujlwm kub lossis ua haujlwm qis, teeb tsa siab);
2. Kev ceev faj txog kev ruaj ntseg valve thiab txoj kev ua haujlwm (rau kev ruaj ntseg valve nrog cov ciaj ntswj);
3. Cov khoom uas yuav tsum tau kuaj xyuas hauv kev ua haujlwm ntawm kev ruaj ntseg valve, tuaj yeem tshwm sim txawv txav thiab kev tiv thaiv kev tiv thaiv, nrog rau kev pov tseg thaum muaj xwm txheej ceev thiab kev tshaj tawm cov txheej txheem.
2. Kev tshuaj xyuas tsis tu ncua yuav tsum tau ua thaum lub sijhawm ua haujlwm ntawm kev ruaj ntseg valve. Lub sijhawm tshuaj xyuas yog tsim los ntawm txhua tus neeg siv raws li qhov xwm txheej tshwj xeeb, thiab qhov ntev yuav tsum tsis pub tshaj ib hlis ib zaug. Cov khoom hauv qab no yuav tsum tau tshuaj xyuas tshwj xeeb:
1. Txawm tias daim ntawv teev npe ua tiav;
2. Kev ruaj ntseg valve foob tsis zoo;
3. Txawm hais tias qhov kev txiav tawm valve siv nrog kev ruaj ntseg valve yog qhib tag nrho thiab lub foob tsis zoo;
4. Txheeb xyuas seb puas muaj qhov tshwj xeeb tshwm sim thaum lub sijhawm ua haujlwm.
5. Txawm hais tias nws tuaj yeem tshem tawm yooj yim thaum lub teeb tsa siab tshaj hauv kev ua haujlwm.
Peb, lub valve kev nyab xeeb nyob rau hauv tus txheej txheem ntawm kev siv, thaum muaj teeb meem nram qab no tshwm sim, tus neeg teb xov tooj yuav tsum tau ceeb toom rau lub tuam tsev nyob rau hauv lub sij hawm raws li cov txheej txheem:
1. Kev kub siab tsis dhau;
2. Tsis txhob rov qab mus rau lub rooj zaum tom qab tshem tawm;
3. Qhov tshwm sim tshwm sim;
4. Ua ntej kev ruaj ntseg valve txiav tawm valve thiab kev ruaj ntseg valve foob poob.
Plaub, lub nkoj siab hauv cov txheej txheem ntawm kev ua haujlwm, kev ruaj ntseg valve ua ntej txiav tawm valve yuav tsum nyob rau hauv ib qho chaw qhib tag nrho thiab foob. Nws yog nruj me ntsis txwv tsis pub jack lub valve kev nyab xeeb kom tuag, tshem tawm lossis kaw qhov txiav tawm. Txhua qhov kev hloov pauv hauv kev ruaj ntseg valve yuav tsum tau pom zoo los ntawm tus saib xyuas.
Tsib, qhov kev nyab xeeb valve nrog kev ua haujlwm siab, yog nruj me ntsis txwv tsis pub ua ib qho kev kho thiab ua haujlwm nrawm. Yuav tsum tau ua cov kev kho thiab lwm yam kev ua haujlwm, cov neeg siv khoom yuav tsum tsim kom muaj kev ua haujlwm zoo thiab kev tiv thaiv kev tiv thaiv, thiab tus kws tshaj lij ntawm kev pom zoo, hauv kev ua haujlwm tiag tiag ntawm lub qhov rooj yuav tsum xa cov neeg los saib xyuas qhov chaw.
Rau, tus neeg teb xov tooj raug txwv tsis pub qhib thiab tshem tawm cov hlau lead los yog kho qhov kev ruaj ntseg valve qhov ntsia hlau.
7. Spare kev nyab xeeb valve yuav tsum tau muab khaws cia kom zoo.
Kawm txog qhov tseem ceeb ntawm Kev Ruaj Ntseg Ntawm Kev Nyab Xeeb Valve - Kawm txog qhov tseem ceeb ntawm Kev Nyab Xeeb Kev Nyab Xeeb Valve - Lyco Valve Abstract: Ib qho qauv rau kev xam qhov tseem ceeb ntawm qhov kev nyab xeeb valve tau nthuav tawm.
Cov txiaj ntsig kev sim qhia tau tias qhov tseem ceeb tshaj plaws ntawm qhov kev nyab xeeb VALVE yog qhov cuam tshuam los ntawm qhov tseem ceeb tshaj plaws ntawm lub nozzle thiab DISC flow resistance coefficient, thiab vim hais tias lub disc ntws tsis kam coefficient loj heev, qhov kev nyab xeeb valve feem ntau critical nyob rau hauv lub valve. flow xeev.
Gb50-89 "Steel Pressure Vessel", raws li lub xeev ntws ntawm qhov kev nyab xeeb valve yog qhov sib txawv, muab tso rau pem hauv ntej ob hom kev hloov pauv hloov pauv, yog li, los txiav txim seb qhov kev nyab xeeb valve puas nyob rau hauv lub xeev tseem ceeb txaus los yog subcritical flow xeev, yog qhov chaw ntawm kev xaiv kom raug ntawm cov qauv kev hloov pauv hloov pauv.
Tam sim no, muaj ob qhov kev xav txog tus nqi ntawm qhov tseem ceeb ntawm qhov sib piv ntawm kev nyab xeeb valve: ① nws tau txiav txim siab tias qhov tseem ceeb ntawm qhov kev ruaj ntseg valve yog tib yam li qhov tseem ceeb ntawm qhov sib piv ntawm lub nozzle hauv cov ntsiab lus ntawm ntau lub teb chaws. , thiab nws tus nqi yog 0.528 [1,2].
② Ntau tus kws tshaj lij thiab cov kws tshawb fawb ntseeg tias qhov sib piv tseem ceeb ntawm qhov kev nyab xeeb valve yog tsawg dua li qhov tseem ceeb ntawm qhov sib piv ntawm lub nozzle, thiab nws cov nqi yog li ntawm 0.2 ~ 0.3 [3] Txog tam sim no, tsis muaj kev sib xyaw theoretical thiab qhov tseeb ntawm qhov tseem ceeb. siab piv ntawm qhov kev nyab xeeb valve tau txais.
Yog li ntawd, kev txiav txim siab qhov tseem ceeb ntawm kev ruaj ntseg valve thiab raug txiav txim siab txog kev nyab xeeb ntawm lub xeev tseem yog ib qho teeb meem ceev uas yuav tsum tau daws hauv engineering, uas tsis tau tshaj tawm hauv cov ntaub ntawv tam sim no.
Los ntawm kev soj ntsuam theoretical thiab kev sim kawm, tus sau tham txog lub xeev ntws ntawm kev nyab xeeb valve thiab muab tso rau pem hauv ntej lub theoretical xam cov mis ntawm qhov tseem ceeb ntawm qhov sib piv ntawm kev nyab xeeb valve.
1 Kev nyab xeeb valve qhov tseem ceeb siab piv qhov tseem ceeb siab piv RCR hais txog qhov sib piv ntawm qhov nkag thiab qhov hluav taws xob siab thaum lub cua ntws tawm mus txog qhov ceev ntawm lub suab ntawm qhov chaw me me.
Qhov sib piv tseem ceeb ntawm lub nozzle tuaj yeem xam los ntawm cov qauv hauv kev xav.
Thaum lub nozzle inlet siab piv yog qis dua los yog sib npaug rau qhov tseem ceeb ntawm qhov sib piv ntawm lub nozzle, qhov cuam tshuam ntawm lub qhov hluav taws xob qhov hluav taws xob tsis tuaj yeem tshaj lub dav hlau sonic vim lub sonic ntws ntawm qhov hluav taws xob seem, yog li qhov cuam tshuam tsis tuaj yeem cuam tshuam qhov ntws. hauv lub nozzle.
Lub airflow siab ntawm lub qhov hluav taws xob seem tseem tsis hloov pauv ntawm P2 / P1 = Cr, cov cua ntws ntawm qhov hluav taws xob yog tseem sonic txaus, thiab cov txheeb ze hloov pauv tsis hloov, xws li W / Wmax = 1. Lub sij hawm no, lub nozzle yog nyob rau hauv ib qho tseem ceeb los yog supercritical flow xeev [4].
Ntxiv rau qhov nozzle, qhov sib piv tseem ceeb ntawm lwm cov qauv feem ntau yuav tsum tau txiav txim siab los ntawm kev sim, thiab qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas yog hu ua qhov ntsuas qhov ntsuas thib ob rau qhov sib txawv.
Vim yog qhov nyuaj ntawm cov qauv kev ruaj ntseg valve, nws yog ib qho nyuaj rau txiav txim siab qhov khiav ceev ntawm qhov me me ntws hla ntu ntu ntawm qhov kev nyab xeeb valve, yog li nws tsis tuaj yeem txiav txim siab qhov tseem ceeb ntawm qhov kev nyab xeeb valve kom raug raws li seb qhov me me ntws hla qhov chaw kaw mus txog qhov nrawm ntawm lub suab.
Tam sim no, txoj hauv kev los txiav txim siab seb qhov kev nyab xeeb valve tau mus txog qhov tseem ceeb ntawm lub xeev yog los ntsuas qhov hloov pauv ntawm qhov kev nyab xeeb valve. Nws ntseeg tau tias qhov kev nyab xeeb valve yuav ncav cuag qhov tseem ceeb ntawm lub xeev ntev npaum li qhov kev hloov pauv tsis hloov nrog lub siab piv [3].
Cov txiaj ntsig ntsuas tau pom tias qhov kev hloov pauv ntawm kev nyab xeeb valve ib txwm hloov pauv nrog kev hloov pauv ntawm lub siab piv, tab sis thaum lub siab piv ntawm qhov kev nyab xeeb valve qis dua 0.2 ~ 0.3, qhov kev hloov pauv ntawm qhov hloov pauv ntawm kev nyab xeeb valve nrog lub siab piv. yog me me, thiab tib neeg xav tias qhov kev hloov me me no yog tshwm sim los ntawm kev ntsuas qhov yuam kev, yog li nws tau txiav txim siab tias qhov sib piv tseem ceeb ntawm lub siab qhib kev ruaj ntseg valve yog li ntawm 0.2 ~ 0.3.
Lub hauv paus theoretical ntawm txoj kev sim no rau kev txiav txim siab qhov tseem ceeb ntawm qhov sib piv ntawm qhov nyem valve yog tias qhov sib piv siab cuam tshuam tsis tuaj yeem tshaj lub dav hlau sonic nyob rau hauv lub xeev tseem ceeb thiab supercritical txaus, yog li ntawd tus txheeb ze tus nqi ntawm lub nozzle tseem tsis hloov.
Txawm li cas los xij, nyob rau hauv lub xeev ntawm qhov tseem ceeb los yog supercritical txaus, qhov ntws ntawm lub qhov hluav taws xob nozzle yog sonic flow, uas ua rau cov txheeb ze hloov chaw.
Raws li qhov inlet siab P1 ntawm kev ruaj ntseg valve nce, lub disc tsis kam siab poob P nce, thiab lub qhov hluav taws xob siab P2 ntawm lub nozzle nyob rau hauv lub valve kuj nce. Raws li qhov tshwm sim, P2 thiab P1 tuaj yeem nce qib ib kauj ruam, ua rau lub siab piv ntawm lub nozzle hauv lub valve r = P2 / P1 maj mam mus rau tus nqi ruaj khov.
Raws li tuaj yeem pom los ntawm kev suav cov mis ntawm nozzle hloov chaw, lub nozzle hloov pauv maj mam dhau los ua tus nqi ruaj khov, thiab kev hloov pauv ntawm kev nyab xeeb valve hloov me ntsis lossis tsis hloov nrog lub siab piv.
Txawm li cas los xij, qhov no tsis tau txhais hais tias qhov khiav ceev ntawm qhov me me ntws hla ntawm qhov kev nyab xeeb valve mus txog qhov ceev ntawm lub suab. Pom tseeb, qhov sib piv siab nyob rau lub sijhawm no tsis tas yuav tsum yog qhov tseem ceeb ntawm qhov siab ntawm lub siab qhib kev nyab xeeb valve.
Ntxiv mus, thaum qhib qhov siab ntawm lub disc me me, qhov sib txawv ntawm qhov kev nyab xeeb valve tsis hloov nrog lub siab piv txawm tias thaum lub siab piv mus txog 0.67. Tau kawg, qhov sib piv siab tsis tuaj yeem suav tias yog qhov sib piv tseem ceeb ntawm qhov kev nyab xeeb valve, rau kev hais lus theoretical, qhov sib piv tseem ceeb ntawm kev ruaj ntseg valve tsis tuaj yeem loj dua qhov tseem ceeb ntawm qhov sib piv ntawm lub nozzle.
Daim duab 1 kev ruaj ntseg valve daim duab kos duab thiab cov theoretical xam qauv los ntawm daim duab 1 b qhia tau hais tias lub nyem valve thiab nws zoo tagnrho sib npaug nozzle yog reflected nyob rau hauv qhov sib txawv ntawm ib tug disc tsis kam siab poob p vim hais tias ntawm ntau yam specifications ntawm tsoos displacement xam txoj kev txais lub zoo tagnrho sib npaug. nozzle qauv xam, thiab tsis quav ntsej qhov cuam tshuam ntawm disc tsis kam siab poob, uas yuav yooj yim tsis meej pem lub nyem valve thiab lub nozzle, Qhov no yuav ua rau tib neeg ntseeg tias qhov tseem ceeb ntawm lub RELIEF VALVE yog tib yam li NOZZLE, 0.528, THAUM TIAG TIAG TIAG LI LAWM VALVE THIAB LUB nozzle yog sib txawv.
Qhov sib txawv tseem ceeb ntawm qhov kev nyab xeeb valve thiab nws qhov zoo tshaj plaws sib npaug nozzle yog xav txog hauv lub disc tsis kam siab poob, thaum cov qauv kev suav ib txwm tsis xav txog lub luag haujlwm ntawm disc tsis kam siab poob P, uas tsis tsim nyog.
Lub theoretical tshaj tawm ntawm nozzle qhia los ntawm qhov tsis zoo li qub yog [5] : 3) Qhov twg, K yog qhov ntsuas adiabatic; A1A2 tsis yog lub valve nozzle inlet thiab qhov hluav taws xob ntawm qhov ntws channel seem; R0 gas tas li; T1 yog inlet kub; R yog qhov sib piv siab ntawm qhov nkag ntawm lub nozzle hauv lub valve, thiab r = 2 / P1. Tam sim no faib ob sab ntawm Equation (1) los ntawm P1 thiab hloov qhov sib npaug (2) thiab (3) rau hauv cov qauv yooj yim, thiab kev sib raug zoo ntawm qhov sib piv ntawm kev ruaj ntseg valve thiab lub siab piv ntawm lub nozzle hauv lub valve tuaj yeem muab tau. Raws li hauv qab no: Hauv Formula (4), qhov sib piv siab ntawm kev nyab xeeb valve B, RBB / 1 Txij li thaum qhov tseem ceeb ntawm kev khiav dej num ntawm lub siab qhib kev nyab xeeb valve yog nyob rau hauv lub caj pas, qhov tseem ceeb txaus lub xeev * ntawm kev nyab xeeb valve tuaj yeem mus txog ntawm lub caj pas nozzle.
Raws li kev sib npaug (7), qhov sib piv tseem ceeb ntawm RBCR ntawm qhov kev nyab xeeb valve feem ntau cuam tshuam los ntawm qhov tseem ceeb ntawm qhov sib piv RCR ntawm lub nozzle thiab disc ntws tsis kam coefficient F.
Thaum lub DISC ntws tsis kam coefficient F nce, qhov tseem ceeb PRESSURE piv ntawm qhov kev nyab xeeb valve yuav txo qis vim tias qhov tseem ceeb ntawm qhov sib piv ntawm lub nozzle yog tas li.
Nws tuaj yeem pom tau tias qhov sib piv tseem ceeb ntawm qhov kev nyab xeeb valve txo qis nrog qhov nce ntawm disc flow resistance coefficient.
Thaum cov ndlwg kuj coefficient nce mus rau ib tug tej yam tseem ceeb tus nqi, qhov tseem ceeb siab piv ntawm kev ruaj ntseg valve yuav raug txo mus rau xoom.
Yog tias DISC RESISTANCE COEFFICIENT dhau qhov txiaj ntsig tseem ceeb no, lub valve tsis tuaj yeem ncav cuag qhov tseem ceeb txaus ntshai vim tias DISC FLOW RESISTANCE coefficient loj dhau, thiab qhov kev nyab xeeb valve yog kiag li nyob rau hauv lub subcritical flow xeev.
Yog li ntawd, yog hais tias muaj ib tug tseem ceeb txaus lub xeev nyob rau hauv lub valve kev ruaj ntseg, qhov tseem ceeb ntawm qhov kev ruaj ntseg valve yuav tsum tsis txhob tsawg tshaj li xoom, uas yog, thaum RBCR ≥0, lub disc ntws kuj coefficient yuav tsum tau raws li F ≥2 / K.
Rau huab cua, k = 1.4 thiab F ≤1.43.
Yog li, yog tias qhov kev nyab xeeb valve nyob rau hauv lub xeev tseem ceeb, nws cov disc ntws tsis kam coefficient F tsis tuaj yeem tshaj 1.43.
Txhawm rau txiav txim siab seb qhov kev nyab xeeb valve puas nyob rau hauv lub xeev tseem ceeb los yog lub xeev tsis txaus, tus neeg sau tau ua qhov kev ntsuam xyuas ntawm cov disc ntws tsis kam coefficient ntawm ob hom kev nyab xeeb li qub, A42Y-1.6CN40 thiab A42Y-1.6CN50. FIG. 2 qhia txog qhov ntsuas kev sib raug zoo ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib piv ntawm qhov kev nyab xeeb valve, uas H yog qhov siab qhib tag nrho thiab Y yog qhov ntsuas qhov siab qhib.
Cov txiaj ntsig kev ntsuam xyuas qhia tau hais tias cov disc ntws tsis kam coefficient ntawm lub siab qhib kev nyab xeeb valve yog ntau tshaj 1.43.
Yog li ntawd, nws tuaj yeem txiav txim siab tias txawm tias qhov nkag siab ntawm kev ruaj ntseg valve loj, qhov kev nyab xeeb valve tsis tuaj yeem ncav cuag qhov tseem ceeb ntawm lub xeev vim tias lub valve disc tsis kam siab poob siab dhau lawm, yog li qhov kev nyab xeeb valve feem ntau nyob rau hauv cov dej ntws. xeev.
Txhawm rau ua pov thawj qhov kev ntseeg siab ntawm qhov kev xav no, tus kws sau ntawv tau sim ntsuas qhov sib piv ntawm ob qhov kev nyab xeeb li qub thiab lub siab piv ntawm lub nozzle hauv lub valve, thiab cov txiaj ntsig kev ntsuas ntawm qhov sib piv ntawm qhov kev nyab xeeb valve thiab qhov sib piv siab ntawm lub nozzle nyob rau hauv lub valve
Cov txiaj ntsig kev sim qhia tau hais tias thaum lub siab nkag ntawm lub siab valve ncav cuag 0.6Pa gauge siab), lub siab piv ntawm lub nozzle hauv ob lub li qub yog ntau tshaj 0.7.
Nws tuaj yeem pom tias lub nozzle hauv lub valve yuav tsum nyob rau hauv lub xeev subcritical flow.
Qhov tseem ceeb ntawm kev khiav dej num ntawm lub siab qhib kev ruaj ntseg valve yog nyob rau ntawm lub caj pas nozzle, thiab qhov tseem ceeb ntawm lub xeev ntawm kev ruaj ntseg valve * tuaj yeem mus txog ntawm lub caj pas nozzle.
Yog li ntawd, thaum lub nozzle nyob rau hauv qhov kev ruaj ntseg valve mus txog rau lub tseem ceeb txaus lub xeev, lub valve kev ruaj ntseg yog nyob rau hauv lub tseem ceeb heev flow xeev.