Air breathing apparatus is a kind of self-contained open air breathing apparatus, air breathing apparatus is widely used in fire fighting, chemical industry, ship, petroleum, smelting, warehouse, laboratory, mining and other departments, for firefighters or rescue personnel in smoke, gas, steam or hypoxia and other environments safe and effective fire fighting, rescue and relief work.

Air breathing apparatus is the use of compressed air positive pressure self-contained open breathing apparatus, the staff exhaled gas from the lungs through the full cover, breathing valve into the atmosphere when the staff exhaled, there is an appropriate amount of fresh air by the gas storage cylinder switch, the pressure reducer in the soft catheter supply valve, the full cover will inhale the gas into the human lungs, complete the entire respiratory cycle process. In this respiratory cycle process, because there are two suction valves and exhalation valves in the comprehensive cover, they are opened in a single direction during the breathing process, so the entire airflow direction is always moving in one direction, constituting the entire respiratory cycle process. Open the gas cylinder valve, and the high pressure air passes through the gas cylinder valve and pressure reducer successively for primary decompression. After that, the medium pressure gas of about 0.7MPa is output and then sent to the air supply valve through the medium pressure airway for secondary decompression. The decompressed gas enters the mask for breathing use by the wearer. The turbidized air exhaled by the human body is discharged into the atmosphere through the exhalation valve on the mask, so that the gas always flows in one direction and does not go against the current.

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