Burgmann Seals

A pump is a machine, powered by an external
source, which imparts energy to a fluid or gas. A pump may be driven by
hand, by an electric motor, by an internal combustion engine, or by
hydraulic or pneumatic means. Pumps can be classified by their method of
displacement into positive displacement pumps, impulse pumps, velocity
pumps, gravity pumps, steam pumps and valueless pumps. [Details]