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Hydraulics

Hydraulics . Flows and restrictions. The various components of an hydraulic system can cause flow restrictions and this results in energy losses through the system. Laminar flow although extremely desirable is hard to achieve. Turbulent flow as shown is the norm for

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Hydraulics

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  1. Hydraulics Flows and restrictions

  2. The various components of an hydraulic system can cause flow restrictions and this results in energy losses through the system

  3. Laminarflow although extremely desirable is hard to achieve

  4. Turbulent flow as shown is the norm for most mobile hydraulic systems

  5. A restriction will cause a pressure drop downstream The energy loss will be given off as heat

  6. If there is no flow there is no pressure drop. The greater the flow the greater the pressure drop

  7. Bernoulli's theorem states that kinetic and potential energy maintain their relationship so that the total energy remains constant, therefore the reduced flow in the wide section causes the pressure rise

  8. Valve flow restrictions Can cause erratic system Operation because of sudden Fluid velocity changes

  9. Pressure drop across a series circuit is cumulative

  10. In a parallel circuit the flow will take the path of least resistance so most of the flow will return to the reservoir through A above.

  11. An open centre spool valve

  12. One way flow control valves Ball type and Poppet type

  13. Two type of adjustable pressure relief valves

  14. Multi-spool hydraulic control

  15. Positive displacement vane pump

  16. Internal gear positive displacement

  17. Axial piston positive displacement pump

  18. The variable displacement axial piston style pump has a movable swash plate to control output

  19. Hydrostatic drive

  20. Remote hydrostatic drive

  21. Typical mechanical drive system

  22. Typical hydrostatic drive system

  23. Simple weight accumulator

  24. Spring loaded accumulator

  25. Piston type pneumatic accumulator

  26. Bladder style pneumatic Accumulator

  27. A very common place to find an Accumulator Would be in the brake hydraulic circuit. It can be used to power the circuit should the pump fail

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