What Are The Oxygen Supply Methods For Compressed Oxygen Self-Rescuer?

The methods Of Oxygen supply for compressed oxygen self-rescuer

(1) quantitative oxygen supply: counterclockwise rotation switch hand wheel, high pressure oxygen from the oxygen cylinder to the reducer, after decompression automatically output oxygen with the flow that not less than 1.2L/min, then the oxygen into the airbag.
(2) manual oxygen supply: press the pressure plate with your fingers, oxygen into the airbag with the flow that not less 1.2L/min, when fingers off the air pressure plate, the oxygen stop.
(3) automatic add oxygen: When the respiratory system is negative pressure, the fill oxygen pressure plate Shrink inward, oppression of the gas rod and open the oxygen valve, oxygen into the airbag with the flow that not less than 60L/min, when the airbag bulging, make up the pressure plate automatically leave the rod that replenishes gas, then stop the addition of gas.