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pump |
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pumpAny device for moving liquids and gases, or compressing gases. Some pumps, such as the traditional lift pump used to raise water from wells, work by a reciprocating (up-and-down) action. Movement of a piston in a cylinder with a one-way valve creates a partial vacuum in the cylinder, thereby sucking water into it. Gear pumps, used to pump oil in a car's lubrication system, have two meshing gears that rotate inside a housing, and the teeth move the oil. Rotary pumps contain a rotor with vanes projecting from it inside a casing, sweeping the liquid round as they move. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In some settings, such as Bangladesh (which has an alluvial delta, high water table, and high population density) the cost of shallow wells with hand pumps may be as low as $3 per capita. Since then several million tubewells have been sunk into the shallow water table, and hand pumps have become an icon of a better life for the rural poor. There are no proven technologies for the removal of arsenic at water collection points such as wells, hand pumps, and springs. |
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Hand pumps
