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The working principle of the fire-resistance breathing valve is to use a spring limit valve plate, which is determined by the positive and negative pressures to exhale or inhale. The breathing valve should have the functions of releasing positive pressure and negative pressure. Specifically: when the container is under positive pressure, the breathing valve opens to release the positive pressure; when the container is under negative pressure, the fire retardant breathing valve opens to release the inhaled gas Negative pressure. This ensures that the pressure is within a certain range and the safety of the container is ensured. One is to exhale or inhale when a certain pressure is reached. The other is designed to only breathe but not breathe. It can be understood as using two check valves with appropriate pressure instead. The fire-resistance breathing valve can not only maintain the pressure balance of the storage tank, ensure that the storage tank is damaged under overpressure or vacuum, but also reduce the medium and loss in the tank. This type of valve should generally be installed horizontally in the pipeline.