原文：
呼吸阀是固定在储罐顶上的通风装置，以保证罐内压力的正常状态，防止罐内超压或真空使储罐遭受损坏，也可减少罐内液体挥发损失。 根据中国《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"，大野公司研制开发SB型系列新产品，具有规格齐全，结构紧凑、重量轻、通风量大、泄露小等优点。产品有单呼阀、单吸阀、呼吸阀，各种结构型式均可与阻火器组合构造，也可配制所需的接管。 工作介质： 汽油、煤油、柴油、芳烃、硫、空气等，或其他石油化工物料，阻火类别的选用根据“HGJ21-89"进行。 操作压力和使用环境温度： 　　呼出压力：B、+980Pa C、+1750Pa D、+4KPa E、+18KPa 　　吸入压力：B、-295Pa C、-295Pa D、-0.5KPa 　　(操作压力指标也可以由用户指定) 　　使用环境温度：-30°C -60°C

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译文：
Breathing valve is fixed in the tank top ventilation to ensure the normal state of pressure in the tank to prevent tank overpressure or vacuum to tank is damaged, can also reduce the liquid in the evaporation loss. According to China's "oil-chemical fire protection design" (GB50160-92) provides: "A and B liquid fixed roof tank, flame arrester should be located and breathing valve," Ono company developed SB series of new products with complete specifications compact, light weight, ventilation capacity, the advantages of small leaks. Products with a single call valve, single suction valve, breathing valve, a variety of structural types can be combined with the fire barrier structure, but also the necessary preparation to take over. Medium: Gasoline, kerosene, diesel oil, aromatics, sulfur, and air, or other petrochemical materials, Fire types of use under the "HGJ21-89" were. Operating pressure and the use of ambient temperature: Exhale pressure: B, +980 Pa C, +1750 Pa D, +4 KPa E, +18 KPa Suction pressure: B,-295Pa C,-295Pa D,-0.5KPa (Operating pressure indicators can be specified by the user) Ambient temperature: -30 ° C -60 ° C