All-weather fire retardant breathing valve is a safety equipment that integrates the functions of flame arrester and breathing valve. It is mainly used to install on the top of the storage tank storing class A, B and C liquids to meet the ventilation requirements of the storage tank size breathing, and to ensure that the storage tank is not damaged during overpressure, while reducing the evaporation loss of the medium in the storage tank.
The working principle of the all-weather fire-retardant breather valve is based on changes in pressure inside the tank. When the pressure inside the tank rises, the positive pressure valve disc is pushed open, and the gas escapes from the breathing valve outlet. When the internal pressure of the tank is reduced, Suction nozzle fire blocking breathing valve the negative pressure valve disc is pushed open by the external atmospheric pressure, and the external air enters the inside of the tank. At the same time, the fire retardant layer can effectively prevent the introduction of external flames to ensure the safety of the storage tank.
The operating pressure range of the all-weather fire breather valve usually includes multiple grades, such as:
Class A: Positive pressure +355Pa (36mmH2O), negative pressure -295Pa (30mmH2O)
Grade B: Positive pressure +980Pa (100mmH2O), negative pressure -295Pa (30mmH2O)
Grade C: Positive pressure +1765Pa (180mmH2O), negative pressure -295Pa (30mmH2O)
All-weather fire-resisting breather valve is one of the necessary new safety equipment for petrochemical storage tank. It has the advantages of good fire-resisting performance, good ventilation performance, corrosion resistance and anti-freezing.
All-weather fire breathing valve structure chart:
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