The breathing valve has the functions of releasing positive pressure and negative pressure. Specifically, when the container bears a certain positive pressure, the breathing valve will open to release the positive pressure of exhaled gas; When the container bears negative pressure, the fire stop breathing valve will open the suction gas to discharge the negative pressure, so as to ensure that the pressure is within a certain range, so as to ensure the safety of the container.

The function of breather valve baffle is mainly reflected in the rapid drop of pressure in the storage tank. When a large amount of air is inhaled into the tank, the air flow blocked by the fire resistant breather valve baffle can not directly impact the surface of oil products, so as to reduce the evaporation of oil products. With the barrier of the baffle, the air flow can be changed from the vertical direction to the horizontal direction, so as to ensure that the inhaled fresh air * is mixed with the gas with low oil and gas concentration at the top of the shut first, so as to reduce the concentration. When the oil pipe changes from sending oil to receiving oil, what is exhaled is the lower concentration gas mixture at the top. This will reduce the consumption of oil. Most of the breather valve baffles will be made into folding type, which can be easily installed or removed from the orifice of the capping joint pipe. The deflector can slow down the air flow when it suddenly changes direction, so as to maintain a high speed in the future movement, so that the inhaled fresh air can be evenly distributed in the upper space of the oil tank.

The breather valve can not only maintain the balance of tank air pressure, but also ensure that the tank will not be damaged in case of overpressure or vacuum, but also reduce the consumption of closed medium.