原文：
呼吸阀是安全阀的一种，它是固定在储罐顶上的通风装置，以保证罐内压的正常状态，防止罐内超压或超真空,使储罐遭受损坏，它也可减少液体挥发损耗，此阀通常与阻火器配套使用。根据国家(石油化工设计防火规范)(GB50160-92)的规定：“甲、乙类液体的固定顶罐，应设阻火器和呼吸阀”。 全天候阻火呼吸阀是石化储罐必备的新型安全设备，其{zd0}优点是阻火呼吸性能好，重量轻，维修方便。它的适用闪点低于28℃的甲类油品和闪点低于60℃的乙类油品。如汽油、煤油、柴油、原油、苯、甲苯、乙醇等介质储罐使用，它在-35℃- +60℃的温度环境中正常工作。 全天候阻火呼吸阀用于安装原油、汽油、煤油、轻柴油、芳烃等固定顶式储罐上的主要安全设备。它是起蒸发损耗与保护储罐在受超压或真空时免遭破坏的作用，还具有通风量大、密封性能好、泄漏量小、耐腐蚀等特点。

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译文：
Breathing valve is a safety valve, which is fixed to the tank top ventilation to ensure the normal state of pressure tank to prevent tank overpressure or ultra vacuum, so that tank is damaged, it can also reduce the liquid volatilization loss, this valve usually supporting the use of flame arresters. According to the (petrochemical fire protection design) (GB50160-92) provides: "A and B liquid fixed roof tank, flame arrester should be located and breathing valve." Fire weather petrochemical storage tank valve is necessary breathing new safety equipment, its biggest advantage is the Fire breathing good performance, light weight, easy maintenance. Its flash point below 28 ℃ for the Group A flash point below 60 ℃ oil and the Group B oil. Such as gasoline, kerosene, diesel, crude oil, benzene, toluene, ethanol and other medium tanks used it in -35 ℃ - +60 ℃ temperature environment to work. Fire weather breathing valve for installation of crude oil, gasoline, kerosene, light diesel oil, aromatics and other fixed-type storage tank on top of the main safety equipment. It is the evaporation loss from the tank in under the protection of over-pressure or vacuum effect from destruction, but also has a ventilation volume, good sealing performance, a small amount of leakage, corrosion and so on.