Raws li tib neeg cov kev cai rau kev tiv thaiv ib puag ncig tau dhau los ua nruj dua, cov kev xav tau ntawm cov li qub kuj tseem nce ntxiv, thiab cov kev cai rau qhov tso cai rau cov pa tawm ntawm cov tshuaj lom, combustible thiab explosive media nyob rau hauv cov nroj tsuag petrochemical yog ntau thiab nruj dua.Valves yog cov cuab yeej siv tsis tau hauv cov nroj tsuag petrochemical., Nws muaj ntau yam thiab ntau ntau, thiab nws yog ib qho ntawm cov khoom xau tseem ceeb hauv cov cuab yeej.Rau cov tshuaj lom, flammable thiab explosive xov xwm, qhov tshwm sim ntawm sab nraud to ntawm lub valve yog hnyav dua li sab hauv to, yog li cov kev cai sab nraud ntawm lub valve tseem ceeb heev.Qhov tsis tshua muaj dej ntawm lub valve txhais tau hais tias qhov dej xau tiag tiag yog qhov me me, uas tsis tuaj yeem txiav txim siab los ntawm cov pa dej siab thiab kev ntsuas huab cua siab sealing.Nws yuav tsum tau siv ntau txoj kev tshawb fawb thiab cov cuab yeej ntse kom pom cov pa tawm me me.

Feem ntau siv cov qauv rau kev kuaj pom qhov tsis tshua muaj paug yog ISO 15848, API624, EPA txoj kev 21, TA luft thiab Plhaub Roj Tuam Txhab SHELL MESC SPE 77/312.

Ntawm lawv, ISO chav A muaj qhov xav tau siab tshaj plaws, ua raws li SHELL chav A. Lub sijhawm no,NSEN tau txais daim ntawv pov thawj tus qauv hauv qab no;

ISO 15848-1 chav kawm A

API 641 Cov

TA-Luvt 2002

Txhawm rau kom ua tau raws li qhov yuav tsum tau ua kom tsis tshua muaj paug, valve castings yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua ntawm helium gas test.Vim tias qhov hnyav molecular ntawm helium molecules me me thiab yooj yim rau kev nkag mus, qhov zoo ntawm cov casting yog qhov tseem ceeb.Qhov thib ob, lub foob ntawm lub cev lub cev thiab lub hau kawg feem ntau yog lub foob gasket, uas yog lub foob zoo li qub, uas yog qhov yooj yim kom ua tau raws li qhov yuav tsum tau ua.Tsis tas li ntawd, lub foob ntawm lub qia valve yog lub foob dynamic.Cov graphite hais tau yooj yim tshem tawm ntawm lub ntim thaum lub zog ntawm lub valve qia.Yog li ntawd, cov ntim tshwj xeeb uas tsis tshua muaj paug yuav tsum raug xaiv thiab qhov kev tshem tawm ntawm cov ntim thiab cov qia valve yuav tsum tau tswj.Kev tshem tawm ntawm lub tes tsho siab thiab lub valve qia thiab lub thawv ntim khoom, thiab tswj cov txheej txheem roughness ntawm lub valve qia thiab lub thawv ntim khoom.