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Bicycle pump
From Wikipedia, the free encyclopedia
A bicycle pump is a type of positive-displacement pump specifically designed for inflating balls (basket,soccer).. It has one or both of the two types of valve in use on bicycles, Schrader or Presta. A third type of valve called the Woods valve exists, but tubes with these valves can be filled using a Presta pump.[1]
Four basic types are available:
- floor models or track pumps
- frame mounted
- compact or mini
- double action
In its most basic form, a bicycle pump functions via a hand-operated piston. During the up-stroke, this piston draws air through a one-way valve into the pump from the outside. During the down-stroke, the piston then displaces the air from the pump into the bicycle tire. Higher-end models have a built in pressure gauge to indicate when the tire is optimally filled.
Caution must be used when using a gas station air pump. Some are designed to cut off before the high pressures used in many bicycle tires are reached. Some others may pump enough air into the small volume of a bicycle tire in a short time to blow out the tire. There is also a slight difference between the modern standard for Schrader valves on an automobile and that on a bicycle which makes some more recent valves on gas station pumps a poor fit.