Product Name: isolated positive pressure oxygen breathing apparatus 

 Product Model: HYZ4 type 

 Coal safety sign: MFA070014 

 Description: 
 The product is the ambulance crew for personal respiratory protection device with reliable performance, and wear comfortable, easy maintenance, etc.. Toxic and harmful gases in coal mines, fire, chemical, tunnels, research, rescue and relief of hypoxia of the environment in disaster ring wear. 

 Product characteristics and uses: 
 HYZ2 / 4 type isolated from positive pressure oxygen breathing apparatus (hereinafter referred to as the respirator) is a mine rescue team members in the rescue work for personal respiratory protection devices. Safe, reliable, comfortable, easy to operate features. 
 This breathing apparatus for mine rescue team members when engaged in rescue work of its respiratory protection from the damage of toxic and hazardous gases. 

 How it works: 
 1, when open the oxygen cylinder, high pressure gas through the pressure reducer decompression into a medium-pressure gas. Medium pressure gas all the way through the demand valve, the other gas through quantitative hole into the low pressure system. When the body is medium labor intensity, quantitative oxygen supply to meet the human need for oxygen. Human labor intensity increases when the balloon pressure demand valve opening pressure of the spring plate contact with the demand valve, demand valve opens, pressurized gas through a demand valve to meet the body's need for oxygen and oxygenation to the balloon. Positive pressure formed within the system, is to rely on the spring plate to compress the air bag and the demand valve oxygen, so always maintain a positive pressure within the respiratory system. 
 2, the low-pressure gas in the balloon through the suction cooling device, suction tubes, suction valve masks, exhaled gas within the mask through the exhalation valve, the expiratory tube, the clean tank to the air bag; when exhaled gas is gradually increased, The positive pressure spring is compressed. At the same time, the location of the spring plate is gradually increased. When the breathing system pressure reaches (400 to 700) Pa, valves, the exhaust valve spring pressure plate to open the top. At this point, the exhaust valve exhaust; human respiration (10 ~ 50) L / min range changes, breathing pressure is always the demand valve, exhaust valve both of automatic adjustment. 

 The main technical indicators: 

 Model HYZ-4 

 Rated protection time of 240 min 
 Oxygen cylinder rated working pressure of 20 MPa 
 Oxygen bottle volume of 2.4L 
 Oxygen storage 480L 
 Respiratory amount of 30L/min 
 Expiratory resistance (0 to 600) Pa 
 Inspiratory resistance ≤ 700Pa 
 Quantitative amount of oxygen ≥ (1.4 - 1.7) L / min. 
 Automatically supplies the amount of oxygen ≥ 80L/min 
 Manually supply the amount of oxygen ≥ 80L/min 
 Automatic supply valve opening pressure (10 to 245) Pa 
 ≤ 1% of carbon dioxide concentration in the inspiratory 
 Inspiratory oxygen concentration of> 21% 
 Alarm alarm pressure (4 to 6) MPa 
 Alarm alarm time (30 ~ 60) s 
 Intensity of sound level ≥ 80dB 
 Overall dimensions of 518 × 370 × 160mm 
 Weight 12kg