(1) quantitative oxygen supply. The oxygen flow of the respirator is used to supply oxygen to the airbag, which can meet the respiratory needs of the wearer in the medium labor intensity.
(2) automatic supply of oxygen. When the intensity of labor is increased and the quantity of oxygen is not enough to meet the needs of the wearer, the automatic replenishment device will automatically supply oxygen to the airbag at a rate greater than 60L/min, and the air bag will close automatically when the air bag is full.
(3) manual supply of oxygen. Manual supply of oxygen can be used when there is too much gas in the airbag to be cleared or automatically resupplied for oxygen to meet the needs or malfunction.