呼吸閥是安裝石油化工固定在儲罐上的通氣裝置，以防止罐內超壓或超真空使儲罐遭受損壞，起阻止外界火焰?zhèn)魅?，減少罐內液體揮發(fā)損耗的作用。

根據(jù)國家《石油化工防火規(guī)范》GB50160的規(guī)定：“甲、乙類液體的固體拱頂罐，應設阻火器和呼吸閥；為了滿足這一要求，我廠于86年始就與中石化北京設計共同研制開發(fā)了全天候防火呼吸閥完整體系。具有造型科學新穎、規(guī)格型號齊全、結構緊湊、重量輕、通氣量大、泄露小等特點。產品結構有呼吸型、單呼型、單吸型、異徑型、夾套型。各種結構形式均可配備阻火器，也可配上所需的呼、吸端連接管，同時對油品、化工品食品不同介質的儲罐采用不同材質制造，滿足各類儲運系統(tǒng)上工藝要求。產品先后經中國石油化工總公司、中國石化北京設計院，科學技術成果鑒定（92）中石化視鑒字01號、（95）BDI鑒字01號，并獲：得中國石化進步三等獎"。

Breathing valve is installed Petrochemical fixed ventilation device in a tank, in order to prevent the tank overpressure or vacuum in the tank is damaged, preventing the external flame into the tank, reduce liquid volatilization loss function.

According to the regulations of the state "standard" fire petrochemical GB50160: "solid vault tank a, B liquid, should set the flame arrestor and breather valve; in order to meet this requirement, I plant in 86 years before and Sinopec Beijing design developed all-weather fire breathing valve complete system. Has the characteristics of other scientific novelty, the specification model is complete, compact structure, light weight, ventilation volume, leakage etc.. Product structure is breathing type, single call type, single suction type, reducing type, with jacket. Various structural forms can be equipped with a flame arrester, may also be required with the call, suction end connecting pipe, oil, chemicals and tank on the food of different medium with different material, fully meet the various requirements of the storage and transportation system technology. The product has the Sinopec Beijing Design Institute of China Petroleum & Chemical Corporation,, identification of scientific and technological achievements (92) treated with Sinopec No. 01, (95) BDI in 01, and won the three prize: Sinopec progress".