All-weather (fire-retardant) breathing valve has the characteristics of large ventilation, good sealing performance, small leakage and corrosion resistance. GFQ-2 new breathing valve is used to install the main safety equipment on fixed item storage tanks such as crude oil, gasoline, kerosene, light diesel and aromatics, which is to play the role of evaporation loss and protection of the tank from damage when it is overpressure or empty. All-weather (flame retardant) breathing valves are usually used in conjunction with flame arresters.