Unit D: Topic 5

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Unit D Topic 5

• Hydraulic and Pneumatic Systems

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Hydraulic Systems

• A closed system using a liquid under pressure.
• Liquids are incompressible and transmit pressure
  evenly in all directions.

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Pneumatic Systems

• Use air instead of liquids.
• The air is not sealed in the device, but sucked
  in from the environment by a powerful motor and
  passes through the device at high pressure where
  it escapes.
• Think of an air pump. The air in the pump is
  compressed, raising its pressure and forcing it
  into a ball with a lower pressure.

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Pneumatics Contd

• Air will always go from an area of high pressure
  to an area of low pressure.
• Examples of pneumatic systems include
  hovercrafts, dentists drills, staple guns,
  sandblasters, and jackhammers.

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Circulatory System as Hydraulic System

• Circulatory system is a closed, hydraulic system
• Heart Pump .moves blood throughout body
• Blood Fluid under pressure (120/80 Pa)
• Blood vessels container
• Valves are movable parts which control how much
  fluid can move through the system.

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Valves and Veins

• Valves are located in veins. When we move our
  muscles blood is forced up where a valve opens up
  above and closes after they close.
• These valves do not let blood sink down to the
  bottom of our bodies. They can only move back up.