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Valves - 14020_145
SYSTEM MAINTENANCE - 14020_147

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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The volume of any gas compressed in a cylinder is directly proportional to the pressure. If the pressure is half, the volume is half, etc. Therefore, if 900 psi of oxygen remains in an 1,800 psi system, half the oxygen is left. A pressure gauge is always mounted at each flight station, usually on the regulator. These gauges are calibrated to indicate from 0 to 2,000 psi on high-pressure systems and 0 to 500 psi on reduced high-pressure systems. TYPICAL GASEOUS OXYGEN SYSTEMS As previously stated, naval aircraft equipped with high-pressure oxygen systems are designed for approximately 1,800 psi, and working pressures reduce to 60 to 70 psi by a reducer or regulator. Systems equipped with pressure reducers are referred to as reduced high-pressure systems. The reduced high-pressure gaseous oxygen system shown in figure 4-5 is typical of such systems. Oxygen is stored in three high- -pressure cylinders and supplies three regulators— one each for the pilot, copilot, and flight engineer. SYSTEM OPERATION The pressure manifold, which is equipped with internal check valves, receives oxygen flow from the cylinders, directs the flow into a common line, and routes it to the pressure reducer. The manifold assembly also connects to a filler line, allowing the three cylinders to be recharged simultaneously from an external supply. The pressure reducer decreases the pressure to 65 psi. Incorporated on the low-pressure side of the pressure reducer is a relief valve, which connects Figure 4-5.—Reduced high-pressure oxygen system schematic, 4-8







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