Kev nyab xeeb nyem valve, tseem hu ua kev ruaj ntseg overflow valve, yog ib qho tsis siv neeg siab nyem twj uas tau tsav los ntawm nruab nrab siab. Nws tuaj yeem siv los ua ob qho kev nyab xeeb valve thiab lub valve nyem nyob ntawm daim ntawv thov.

Siv Nyiv ua piv txwv, muaj qee qhov kev txhais meej meej ntawm kev nyab xeeb li qub thiab nyem li qub. Feem ntau, cov khoom siv kev nyab xeeb siv rau lub zog loj cia siab cov hlab ntsha xws li boilers yog hu ua kev ruaj ntseg li qub, thiab cov uas tau nruab rau hauv cov kav dej los yog lwm qhov chaw hu ua relief valves. Txawm li cas los xij, raws li cov kev cai ntawm "Technical Standards for Thermal Power Generation" ntawm Ministry of International Trade thiab Industry of Japan, qhov tseem ceeb ntawm cov khoom siv kev ruaj ntseg hais txog kev siv cov kev nyab xeeb li qub, xws li boilers, superheaters, reheaters, thiab lwm yam. Nyob rau hauv cov xwm txheej uas sab qis ntawm lub siab txo valve yuav tsum tau txuas nrog lub boiler thiab turbine, ib tug nyem valve los yog kev ruaj ntseg valve yuav tsum tau muab ntsia. Nyob rau hauv txoj kev no, qhov kev nyab xeeb valve yuav tsum muaj kev ntseeg siab ntau dua li lub valve nyem.

Tsis tas li ntawd, los ntawm kev tswj hwm roj hluav taws xob siab ntawm Ministry of Labor ntawm Nyiv, cov kev cai ntawm Ministry of Transport thiab nkoj cov koom haum ntawm txhua theem, kev txheeb xyuas thiab cov kev cai ntawm kev nyab xeeb ntim ntim, peb hu rau lub valve uas lav qhov paug tawm. ntim ib qho kev nyab xeeb valve, thiab lub valve uas tsis lav lub ntim ntim ib lub valve nyem. Nyob rau hauv Suav teb, txawm tias nws yog puv-qhib lossis micro-qhib, nws tau sau npe hu ua kev nyab xeeb valve.

1. Txheej txheem cej luam

Kev nyab xeeb li qub yog cov khoom siv tseem ceeb rau kev nyab xeeb rau boilers, cov hlab ntsha siab thiab lwm yam khoom siv siab. Kev ntseeg siab ntawm lawv txoj haujlwm thiab kev ua tau zoo ntawm lawv cov kev ua tau zoo yog cuam tshuam ncaj qha rau kev nyab xeeb ntawm cov khoom siv thiab cov neeg ua haujlwm, thiab muaj kev sib raug zoo nrog kev txuag hluav taws xob thiab kev tiv thaiv ib puag ncig. Txawm li cas los xij, qee cov neeg siv thiab cov chaw tsim khoom ib txwm xaiv cov qauv tsis raug thaum xaiv. Vim li no, tsab xov xwm no tshuaj xyuas cov kev xaiv ntawm kev nyab xeeb li qub.

2. Kev txhais

Lub thiaj li hu ua kev ruaj ntseg li qub feem ntau muaj xws li nyem li qub. Los ntawm cov kev tswj xyuas, cov li qub ntsia ncaj qha rau ntawm chav boilers lossis ib hom ntawm cov hlab ntsha siab yuav tsum tau pom zoo los ntawm lub tuam tsev saib xyuas kev ua haujlwm. Hauv kev nkag siab nqaim, lawv raug hu ua kev nyab xeeb li qub, thiab lwm tus feem ntau hu ua nyem li qub. Kev nyab xeeb li qub thiab nyem li qub zoo sib xws hauv cov qauv thiab kev ua haujlwm. Ob leeg cia li tso tawm qhov nruab nrab sab hauv thaum qhib siab dhau los ua kom muaj kev nyab xeeb ntawm cov khoom siv ntau lawm. Vim qhov tseem ceeb zoo sib xws, tib neeg feem ntau tsis meej pem thaum siv lawv. Tsis tas li ntawd, qee cov cuab yeej tsim khoom kuj tau teev tseg tias ob hom tuaj yeem xaiv tau hauv cov cai. Yog li ntawd, qhov sib txawv ntawm ob feem ntau tsis quav ntsej. Yog li ntawd, muaj ntau yam teeb meem tshwm sim. Yog tias peb xav muab lub ntsiab lus meej ntawm ob, peb tuaj yeem nkag siab lawv raws li cov ntsiab lus hauv thawj ntu ntawm ASME Boiler thiab Pressure Vessel Code:

(1)Kev nyab xeeb valve, tsis siv neeg siab nyem twj uas tau tsav los ntawm lub siab zoo li qub ntawm qhov nruab nrab nyob rau hauv pem hauv ntej ntawm lub valve. Nws yog tus cwj pwm los ntawm kev qhib tag nrho nrog kev qhib tam sim ntawd. Nws yog siv rau hauv kev siv roj lossis chav siv.

(2)nyem valve, tseem hu ua overflow valve, yog ib qho tsis siv neeg siab nyem twj uas tau tsav los ntawm lub siab zoo li qub ntawm qhov nruab nrab nyob rau hauv pem hauv ntej ntawm lub valve. Nws qhib nyob rau hauv kev faib ua feem rau qhov nce siab tshaj qhov qhib quab yuam. Nws yog tsuas yog siv nyob rau hauv daim ntawv thov kua.