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All pumps require some form of external power source to operate. Hydraulic pumps use the kinetic energy of water as their main source of operation because they convert mechanical energy into a new form of hydrostatic energy. The hydraulic pump can be powered by motors running on gasoline, diesel, natural gas or electricity. Some types of hydraulic pumps usually supply water by gravity, and they pump water from the same source they pump out. In addition to the use of natural elements, these types of continuous running pumps are often used for water supply on farms. A good example is a windmill, which uses a hydraulic pump to lift water from deep above the ground in the wind above. For many years, hydraulic pumps have been very popular in government, industrial and commercial applications worldwide. With the introduction of modern types of electric and solar pumps, hydraulic pumps have lost popularity, and these new pumps have become more fashionable. Because they can use a minimum amount of energy to propel large amounts of liquid over long distances and have relatively low maintenance requirements, they are now becoming increasingly popular again, especially in developing countries. They are relatively safe and efficient to operate, and their three obvious advantages are:

• Energy efficient: Hydraulic pumps generally consume less energy than other types of pumps to accomplish the same work or transfer the same volume of liquid. They are generally considered to be 80% more efficient than pneumatic type systems.

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