Pumps are devices generally used to move or compress liquids or gases by mechanical actions. Ancient Greeks utilized force pumps to raise water from wells and similar air pump operated devices were used in their temples and theaters. The Romans adopted and improved upon these useful devices. The bilge or burr pump was used aboard a ship during the Middle Age and as the industrial revolution began, there was an increased need of pumps for draining mines and for supplying power for cranes, hoist and lifts, thus begins the development of centrifugal pumps.
The simplest form of a pump consists of a piston inside a cylinder as the syringe. At present, pumps can be classified according to their methods of displacement; positive displacement pumps, velocity pumps, impulse pumps, steam pumps, gravity pumps and valveless pumps. Positive displacement pumps works by producing displacement as pumping action causes a decrease in volume in the working chamber of the pump. Examples of this type of pump are the rotary, reciprocating, gear, screw, progressive, roots-type, vane and other positive displacement pumps. Velocity pumps or dynamic pumps work by increasing the flow velocity to add kinetic energy on the pumped fluid. Examples of this type of pump are radial-flow, axial-flow, mixed-flow and educator-jet pumps. Impulse pumps work by using pressure created by gas. Examples of this type of pump are the hydraulic ram, pulser and airlift pumps. Steam pumps are those powered by steam engines and piston-less pumps, whereas gravity pumps are those which utilize gravitational force to lift water. The valveless pumps, on the other hand, do not require physical occlusions or valves to regulate flow.
Pumps have variety of use nowadays. It is used to deliver water in homes (water supply) and in industries (agriculture, mining, engineering, biomedical) to circulate water and fuel or working fluid as in automobiles, to transport oil and other fluids, to drain coffer dams and mine shafts, to help in power transmission and other various applications such as air conditioning systems, refrigeration system, flood control, marine services, chemical and sewage movement etc. With the increasing practical use of pumps, the market now offers a variety of pumps and its parts at reasonable costs. Advances in technology continuously upgrade the types and designs of pumps that are now available in the market. Pumps that require only flow meter to measure volume rather than air chamber, diaphragm pump, or the wide selection of spa pumps or heater, like the force 5 heater pumps and force 5 pump which is used in dewatering systems are now readily available even online. Installation, hire pumps services as well as repairs and electric motor rewind are also commonly offered by many companies for ease and convenience of consumers. Professionals or those who have technical training on this area usually do the repair and rewinding of motor pumps.