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Hydraulic Reservoir

 Hydraulic Reservoir

  • The hydraulic reservoir is used to hold the volume of fluid, transfer heat from the system, allow solid contaminants to settle, and facilitate the release of air
  • and moisture from the fluid.
  • The reservoir, has its own housing and is connected with other hydraulic components by a tubing or a hose.
  • The space above the normal level of the fluid is used for fluid expansion and for escape of trapped air.
  • There are two types of hydraulic reservoirs: vented reservoirs and pressured reservoirs.
  • In vented reservoirs, atmospheric pressure and gravity are the forces that cause fluid to flow out of the reservoir and into the pump.
  • To supply a pump with fluid, a vented reservoir must be positioned at a higher location than the pump.
  • If the reservoir and the pump were at the same level, then gravity would have no effect on fluid flow.
  • If the reservoir was at a level below the pump, then fluid would tend to run out of the pump and into the reservoir.
  • In this case, the pressurized reservoir can force the fluid upward into the pump.
  • If the aircraft flies at very high altitudes, then atmospheric pressure decreases as the altitude increases. In this case, it is also necessary to use the pressurized reservoirs to force fluid into the pump.


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