求翻译：目前使用的罐顶呼吸阀质量较差，更换可靠性高的呼吸阀，保证储罐压力稳定，减少油气外排。根据实际，对石脑油、苯、己烯-1、甲醇、丙酮、粗裂解汽油、苯酚、2#裂解重馏分、轻污油储罐总计42台呼吸阀进行更换。是什么意思？

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The current use of the top of tank breathing valve is of poor quality, replace high reliability of the breathing valve to ensure that the tank pressure is stable, reduce oil and gas discharge. Based on the actual, naphtha, benzene, and vinyl-1, methyl alcohol, acetone, coarse cracker gasoline, pheno

At present uses the tank deck respiration valve quality is bad, the replacement reliability high respiration valve, guaranteed the storage tank pressure is stable, reduces outside the oil gas to arrange.According to actual, to the naphtha, the benzene, the hexylene - 1, the methyl alcohol, the aceto

Currently used tank top valve quality is poor, replace the high reliability of the valve, ensure the tank pressure stability, reduce the discharge of oil and gas outside. Based on actual, naphtha, benzene and hexene-1 coarse cracked, methanol, acetone, gasoline, phenol, 2# cracking of heavy fraction

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