QG-HYZ4001 Isolated Positive pressure compressed oxygen respirator Facing the influx of foreign products to take a large market share in China, whie the extensive use of domestic equipment by rescue teams when in disaster relief, introspecting the merrits and faults of our present products , our company designed a breathing apparatu featuring small size , stable performance , small breathing resistance and comfort breathing to reduce fatigue especially under the great amount of hard work , convenience and easy maintenance after use . The newly-designed breathing apparatu has improved a lot in its design compared with foreign products. and achieved eight key technologies for utility model: (1). Using peripheral Quantified Oxygen Devices to make the adjustment of the oxygen flow more convenient and reliable. (2). Using the structural design of making the exhaling air directly into the lower part of the respiratory compartment to bring about overpressure emission of the waste air. (3). By reducing the screw,clamp and other joints, performance is made more secure and maintainance easier. (4). The respiratory compartment is seperated by the purifying tank fixed at the big hole at the centre of the respiratory compartment into the upper compartment and lower compartment. In this way the inhaling air is cleaned by the purifying tank , contains less carbon dioxide within the effective rescue time and the respiratory resistance is small . (5). Using two positive pressure springs to design positive pressure compartment mechanism. (6). A backflow barrier is used at the end of self compensating valve and hand filling valve to effectively prevent condensed water from flowing into the the pipe , largely extending the time for replacement of gas canister. (7). The compartment structure makes the purifying and maintenance of the OBA very convenient after carrying the OBA, the whole process can be completed within just a few minutes. It is known to be the the most convenient and efficient among the breathing apparatus. Specifications: Model QG-HYZ4001 Rated protective time/Duration ≥240minutes(i.e. 2h) Period of use under moderately severe conditions 1h Period of use under extremely heavy severe conditions 4h Rated pressure of the cylinder 20MPa Rated reserves in the cylinder 540Litres Oxygen cylinder 540litres at 20Mpa fill Constant Rate of Flow 1.6±0.2L/min Demand Valve ≥80 L/min Bypass Valve ≥80 L/min Vent Valve Maximum Value 400~700Pa Bypass Valve Minimum Value 1.40~180 Pa Inhalation Temperature ≤35 Weight of CO2 Absorbent 1.8kg Weight 11 kg Size 470×350×160mm Weight-fully Charged 14kg