Water pumps

A water pump is a machine that conveys liquid or raises its pressure. It transfers the mechanical energy of a prime mover, or other external energy, to the liquid so that the energy of the liquid increases. It is mainly used to convey liquids including water, oil, acids and alkalis, emulsions, suspensions and liquid metals.

It can also convey mixtures of liquid and gas, and liquids containing suspended solids. The technical parameters of pump performance include flow rate, suction lift, head, shaft power, water power and efficiency. According to the operating principle, pumps are divided into positive-displacement pumps and vane pumps. A positive-displacement pump transfers energy through a change in the volume of its working chamber; a vane pump transfers energy through the interaction between rotating vanes and the water, and includes centrifugal, axial-flow and mixed-flow types.