Reservoir manual air bleed valve

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Nonpressurized Reservoirs

Aviation Structural Mechanic

Chemical air drier

RESERVOIR MANUAL AIR BLEED (VENT) VALVE. A vent valve is provided to vent the reservoir. This valve is connected to the reservoir vent line to allow depressurization of the reservoir. The valve is actuated prior to servicing the reservoir to prevent fluid from being blown out of the filler as the cap is being removed. Figure 7-6 shows a full sectional view of a manual air bleed valve. Pressing the slide valve opens a passage to vent the reservoir.
Air-Pressurized Reservoirs

Air-pressurized reservoirs are currently used in many high-performance naval aircraft. Figure 7-7

Figure 7-7.Air-pressurized reservoir and components.

Figure 7-8.Chemical air drier.

shows a hydraulic power system with an air-pressurized reservoir incorporated. This system is similar to the one found on many aircraft; however, for clarification in the discussion of the operation of the system, we have deleted some components between the reservoir and the pump.

The reservoir is cylindrical in shape and has a piston installed internally to separate the air and fluid chambers. The piston rod end protrudes through the reservoir end cap and indicates the fluid quantity. The quantity indication may be seen by inspecting the distance the piston rod protrudes from the reservoir end cap. The reservoir has threaded openings for the connection of fittings and components. The schematic shown in figure 7-7 shows several components installed in lines leading to and from the reservoir; however, this may not be the case in the actual installation. The air relief valve, bleeder valve, etc., may be installed directly on the reservoir. Because the reservoir is pressurized, it can normally be installed at any attitude and still maintain a positive flow of fluid to the pump.