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

To access more topics go to the Combined Science Notes page

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