Raws li cov neeg xav tau kev tiv thaiv ib puag ncig tau dhau los ua qhov nruj dua, cov kev cai rau cov li qub kuj nce ntxiv, thiab cov kev cai rau qib kev xau ntawm cov tshuaj lom, cov khoom siv hluav taws xob thiab cov khoom tawg hauv cov nroj tsuag petrochemical tau dhau los ua qhov nruj dua. Cov li qub yog cov khoom siv tseem ceeb hauv cov nroj tsuag petrochemical. , Nws ntau yam thiab ntau yog loj, thiab nws yog ib qho ntawm cov chaw xau tseem ceeb hauv lub cuab yeej. Rau cov tshuaj lom, cov khoom siv hluav taws xob thiab cov khoom tawg, cov txiaj ntsig ntawm kev xau sab nraud ntawm lub valve yog qhov loj dua li qhov xau sab hauv, yog li cov kev cai xau sab nraud ntawm lub valve yog qhov tseem ceeb heev. Qhov xau qis ntawm lub valve txhais tau tias qhov xau tiag tiag yog me heev, uas tsis tuaj yeem txiav txim siab los ntawm kev ntsuas dej siab thiab cua siab. Nws xav tau ntau txoj hauv kev tshawb fawb thiab cov cuab yeej siv zoo los ntes cov xau sab nraud me me.

Cov qauv siv feem ntau rau kev ntes cov pa roj tsawg yog ISO 15848, API624, EPA txoj kev 21, TA luft thiab Shell Oil Company SHELL MESC SPE 77/312.

Ntawm lawv, ISO chav kawm A muaj qhov yuav tsum tau ua siab tshaj plaws, ua raws li SHELL chav kawm A. Lub sijhawm no,NSEN tau txais cov ntawv pov thawj txheem hauv qab no;

ISO 15848-1 chav kawm A

API 641

TA-Luft 2002

Yuav kom ua tau raws li qhov yuav tsum tau ua ntawm qhov xau tsawg, cov khoom siv valve castings yuav tsum ua tau raws li qhov yuav tsum tau ua ntawm kev sim roj helium. Vim tias qhov hnyav molecular ntawm cov molecule helium me me thiab yooj yim nkag mus, qhov zoo ntawm qhov casting yog qhov tseem ceeb. Qhov thib ob, lub foob ntawm lub cev valve thiab lub hau kawg feem ntau yog lub foob gasket, uas yog lub foob static, uas yooj yim ua kom tau raws li qhov yuav tsum tau ua. Ntxiv mus, lub foob ntawm lub valve qia yog lub foob dynamic. Cov khoom graphite yooj yim raug tshem tawm ntawm cov ntim thaum lub sijhawm txav ntawm lub valve qia. Yog li ntawd, yuav tsum xaiv cov ntim tshwj xeeb uas xau tsawg thiab qhov sib txawv ntawm cov ntim thiab lub valve qia yuav tsum tau tswj. Qhov sib txawv ntawm lub tes tsho siab thiab lub valve qia thiab lub thawv ntim khoom, thiab tswj qhov ua tiav ntawm lub valve qia thiab lub thawv ntim khoom.