Bicycle pump in action. Image credit mpora.com

Bicycle pump in action. Image credit mpora.com

ZIMSEC O Level Combined Science Notes: Pumps: Cycle pump

  • They are used to inflate bicycle tires
The internal structure of a cycle pump

The internal structure of a cycle pump

  • Air is compressed in cylinder A by the piston
  • The piston is fitted with a leather or rubber washer
  • This gives an air-tight fit when there is compression in cylinder A
  • When the piston is pushed inwards
  • The air in A is force through the rubber valve into the rubber tube
  • This valve prevents air from escaping
  • When the piston is moved outwards the valve prevents air already in the rubber tube from escaping
  • There is a hole at the top of the cylinder
  • This allows air to enter into the pump cylinder
  • The cycle is repeated when the piston is pushed inwards
  • Since the hole is near the top end air can no longer escape through it when its is being compressed

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