Football pumps are essentially like bicycle pumps. In fact, you often find bicycle pump used along with football pump adaptors used to inflate your football.
A bicycle tire pump essentially works most other simple force pumps. You find a valve which blocks the actual flow of any air out of your given pump to the atmosphere when on the downstroke. There is also another valve which in effect stops any flow of air from the particular tire to your pump cylinder while on the upstroke.
While such pumps for tires as well as footballs come in a range of shapes in addition to styles, this functioning is probably the most common of the varieties available.
Some more modern bicycle pumps have an additional set of valves so as to fill faster.
Visit www.bbc.co.uk for more on workings of pumps.
A bicycle tire pump essentially works most other simple force pumps. You find a valve which blocks the actual flow of any air out of your given pump to the atmosphere when on the downstroke. There is also another valve which in effect stops any flow of air from the particular tire to your pump cylinder while on the upstroke.
While such pumps for tires as well as footballs come in a range of shapes in addition to styles, this functioning is probably the most common of the varieties available.
Some more modern bicycle pumps have an additional set of valves so as to fill faster.
Visit www.bbc.co.uk for more on workings of pumps.