0102 ib0304 ib05
Ua tib zoo saib xyuas qhov kev xaiv kom raug ntawm cov li qub hauv cov kav dej hauv tsev - Cov lus qhia rau kev xaiv ntawm qhov tseem ceeb ntawm qhov chaw nyob hauv cheeb tsam tswj
Xyoo 2022-10-13
Ua tib zoo saib xyuas qhov kev xaiv kom raug ntawm cov kav dej hauv lub tsev kav dej - Cov lus qhia rau kev xaiv ntawm qhov tseem ceeb ntawm lub valve nyob rau hauv qhov chaw tswj hauv lub tsev kav, li qub ua lub luag haujlwm ntawm kev tswj dej. Vim yog cov qauv sib txawv thiab cov khoom siv, yog li cov khoom tsim tawm tsis zoo ib yam. Txhawm rau kom ntseeg tau tias cov raj xa dej tuaj yeem ua tiav cov txiaj ntsig zoo dua, tus nqi qis dua thiab lub neej ua haujlwm ntev tshaj plaws, kev xaiv kom raug ntawm cov li qub yog qhov tseem ceeb heev. Lub valve muaj plaub lub luag haujlwm tseem ceeb: pib thiab nres qhov ntws ntawm kev tshaj tawm; Kho qhov nruab nrab ntws; Tiv thaiv rov qab los yog reflux thiab tswj los yog txo cov kua dej. Kev xaiv cov kav dej hauv tsev tuaj yeem txiav txim siab raws li qhov ntsuas kub, nruab nrab hom, kub thiab lwm yam. Piv txwv li, nyob rau hauv lub high-sawv vaj tse hluav taws kub hydrant valve tswj valve yuav tsum tau siv lub teeb liab, qhov no yog hais txog seb lub qhov hluav taws kub hydrant system yog tus yuam sij rau kev siv, thaum hluav taws kub hydrant system tswj li qub tau teem rau lub teeb liab valve, thiab valve qhib los tso rau hauv nruab nrab ntawm kev tswj hluav taws xob, txhawm rau txhawm rau txhim kho kev tswj xyuas kev tswj xyuas, txawm tias tus nqi tau nce, txawm li cas los xij, qhov piv ntawm kev nqis peev rau tag nrho cov hydrant system tseem tsawg heev, thiab nws tuaj yeem ua rau tag nrho kev nyab xeeb ntawm lub hydrant system, uas tsim nyog rau kev nqis peev. Hom valve siv nyob rau hauv ib lub tsev piping system yuav tsum raug xaiv raws li cov yam ntxwv ntawm lub tsev. Yog tias lub valve siv tsis haum rau cov qauv tsim ntawm lub tsev, muaj ntau yam kev phom sij yuav tshwm sim tas li. Kev xaiv ntawm valve positioner yuav cuam tshuam ncaj qha rau kev ua haujlwm thiab qhov zoo ntawm kev tswj lub valve thiab tswj qhov system. Yog li yuav ua li cas xaiv lub valve positioner kom raug thiab tsim nyog yog qhov tseem ceeb tshwj xeeb hauv kev tswj xyuas. Cov lus tseem ceeb: valve positioner xaiv phau ntawv qhia hauv ntau daim ntawv thov tswj, valve positioner yog ib qho tseem ceeb tshaj plaws accessories. Rau ib daim ntawv thov tshwj xeeb, yog tias koj xav xaiv qhov zoo (lossis zoo) valve locator, koj yuav tsum xav txog cov hauv qab no: 1) Lub valve puas tuaj yeem yog "split-ranging"? Nws puas yooj yim thiab yooj yim rau kev siv "splitting"? Muaj kev ua haujlwm "split" txhais tau hais tias lub valve positioner tsuas yog teb rau ntau qhov kev tawm tswv yim (xws li, 4 txog 12mA lossis 0.02 txog 0.06MPaG). Yog li ntawd, yog tias koj tuaj yeem "sib faib", koj tuaj yeem ua raws li qhov xav tau tiag tiag, tsuas yog ib lub tswv yim tawm tswv yim kom ua tiav cov kev tswj ntawm ob lossis ntau dua li qub. 2) Puas yog qhov kev hloov ntawm xoom point thiab ntau yam yooj yim thiab yooj yim? Nws puas tuaj yeem kho xoom thiab ntau yam tsis tau qhib lub hau? Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qee zaum qhov kev hloov kho tsis raug cai yuav tsum raug txwv kom tsis txhob muaj kev ua haujlwm tsis raug (lossis txhaum cai). 3) Qhov kev ruaj ntseg ntawm xoom thiab ntau yam yog dab tsi? Yog hais tias lub ZERO thiab RANGE yog PRONE RAU DRIFT nrog kev hloov nyob rau hauv qhov kub thiab txias, VIBRATION, lub sij hawm, los yog input presses, lub VALVE POSITIONER yuav tsum tau muab rov qab ntau zaus los xyuas kom meej qhov kev mus los. 4) Yuav ua li cas yog lub valve positioner? Qhov zoo tshaj plaws, rau lub teeb liab tawm tswv yim, Trim Parts ntawm lub valve (Tim qhov chaw, suav nrog spool, qia, valve lub rooj, thiab lwm yam) txhua lub sijhawm yuav tsum raug muab tso rau hauv txoj haujlwm xav tau, tsis hais txog kev mus los lossis tswj lub valve nrog li cas. ntau load ntawm sab hauv. 5) Dab tsi yog qhov xav tau ntawm huab cua zoo ntawm valve positioner? Raws li tsuas yog ib qho me me ntawm cov khoom siv cua tuaj yeem muab tau kom tau raws li ISA cov qauv (cov qauv cua zoo rau kev ntsuas: ISA STANDARD F7.3) RAU AIR, THIAB TSEV KAWM NTAWV AIR-MOBILIZED OR ELECTRIC-GAS (VALVE) POSITIONERS, YOG YOG YUAV TSUM TAU TXAIS KEV NOJ QAB HAUS HUV NTAUB NTAWV, lawv yuav tsum muaj peev xwm tiv taus qee qhov nyiaj ntawm plua plav, noo noo thiab roj. 6) Puas yog qhov ntsuas ntawm xoom thiab ntau yam cuam tshuam rau ib leeg lossis lawv muaj kev ywj pheej? Yog tias lawv cuam tshuam rau ib leeg, qhov xoom thiab qhov sib txawv yuav siv sijhawm ntau los kho, vim tias lub tuner yuav tsum rov kho ob qhov tsis zoo no kom maj mam ncav cuag qhov tseeb. 7) Puas yog lub valve positioner nruab nrog "Bypass" uas tso cai rau lub teeb liab tawm los ua ncaj qha rau ntawm tus tswj hwm? Qhov "bypass" no tuaj yeem ua kom yooj yim lossis tshem tawm qhov kev ntsuas ntawm Actuator Settings, xws li: "Benchset setting" thiab "Seat Load setting" ntawm tus actuator - qhov no yog vim muaj ntau zaus, cov teeb liab tso tawm aerodynamic ntawm qee qhov pneumatic regulators. ntais ntawv "lub rooj zaum" ntawm tus actuator raws nraim kom tsis txhob muaj kev teeb tsa ntxiv (qhov tseeb, qhov no, Valve positioners tuaj yeem raug tshem tawm tag nrho. Yog tias xaiv, ces lub valve positioner kuj siv tau los "bypass" pneumatic tso zis teeb liab ntawm pneumatic regulator ncaj qha rau ntawm tus regulator). Ntxiv rau, nrog rau "bypass" qee zaum kuj tuaj yeem tso cai rau kev hloov pauv lossis kev saib xyuas ntawm lub valve positioner online (uas yog, kev siv lub valve positioner "bypass" kom lub regulator tseem ua haujlwm li qub, tsis tas yuav yuam tus tswj offline. ). 8) Puas yog kev ua haujlwm ntawm lub valve positioner ceev? Airflow Qhov ntau dua qhov airflow (lub valve locator tas li sib piv cov teeb liab input thiab lub valve theem thiab kho nws cov zis raws li qhov sib txawv. Yog hais tias lub valve positioner teb sai sai rau qhov sib txawv, ces huab cua ntau dua nyob rau hauv ib chav tsev lub sij hawm), qhov ceev ntawm kev hloov. system teb rau Setpoint thiab load variations - uas txhais tau hais tias tsawg system yuam kev (lag) thiab tswj zoo dua. 9) Tus yam ntxwv zaus ntawm lub valve positioner (los yog zaus teb, zaus teb - G (jω), dab tsi yog qhov ruaj khov-lub xeev cov lus teb ntawm lub kaw lus mus rau sinusoidal input? qhov siab dua qhov kev nkag siab ntawm cov lus teb zaus), qhov kev tswj xyuas tau zoo dua, Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias cov yam ntxwv zaus yuav tsum tau txiav txim siab los ntawm Kev Ntsuas Kev Ntsuas es tsis yog cov txheej txheem theoretical, thiab lub valve positioner thiab actuator yuav tsum tau txiav txim siab ua ke thaum ntsuas qhov ntsuas. Cov yam ntxwv zaus 10) Dab tsi yog qhov siab tshaj plaws ntawm qhov ntsuas cua ntawm lub valve positioner? Piv txwv li, qee qhov valve positioners muaj qhov ntsuas cua loj dua ntawm tsuas yog 501b / hauv (xws li 50psi, lpsi = 0.07kgf / cm ≈ 6.865kpa), lub valve positioner dhau los ua qhov txwv rau actuator tso zis thrust yog tias tus actuator raug ntsuas los ua haujlwm. ntawm qhov siab tshaj 501b/in. 11) Thaum cov tswj valve thiab valve positioner tau sib sau ua ke thiab ua ke, lawv txoj kev daws teeb meem li cas? Qhov no muaj txiaj ntsig zoo rau kev tswj hwm kev tswj hwm qhov zoo, vim tias qhov kev daws teeb meem siab dua, qhov ze dua qhov chaw ntawm qhov kev tswj hwm lub valve yog qhov zoo tagnrho, thiab qhov kev hloov pauv hloov tau tshwm sim los ntawm Overshooting ntawm regulating valve tuaj yeem tswj tau, thiaj li txwv cov kev hloov raws sij hawm ntawm kev tswj kom muaj nuj nqis. 12) Puas yog qhov zoo thiab qhov tsis zoo hloov pauv ntawm lub valve positioner puas ua tau? Puas yog qhov kev hloov pauv tau yooj yim? Qee zaum qhov no yog qhov tsim nyog. Piv txwv li, hloov lub "SIGNAL INCRREASe-VALVE CLOSE" hom rau "SIGNAL INCREASE-VALVE OPEN" MODE, koj tuaj yeem siv lub VALVE POSitioner qhov zoo thiab tsis zoo CONVERSION muaj nuj nqi. 13) Yuav ua li cas txoj haujlwm sab hauv thiab kev saib xyuas ntawm lub valve positioner? Raws li peb txhua tus paub, ntau qhov chaw, qhov nyuaj ntawm cov qauv kev ua haujlwm sab hauv, kev cob qhia ntau dua rau kev saib xyuas (kho) cov neeg ua haujlwm, thiab ntau cov khoom seem hauv Tshuag. 14) Dab tsi yog qhov Steady-state Air Consumption ntawm lub valve positioner? Rau qee qhov kev cog qoob loo, qhov ntsuas no yog qhov tseem ceeb thiab tuaj yeem yog qhov txwv. 15) Tau kawg, lwm yam tseem ceeb kuj yuav tsum tau txiav txim siab thaum ntsuas thiab xaiv lub valve positioners. Piv txwv li, Cov Lus Qhia Txuas ntawm lub valve positioner yuav tsum muaj kev cuam tshuam txoj hauj lwm ntawm lub spool; Tsis tas li ntawd, lub valve positioner yuav tsum muaj zog thiab ruaj khov, nrog kev tiv thaiv ib puag ncig thiab corrosion kuj, thiab yooj yim rau nruab thiab txuas.