Centrifugal pumps are used to transport fluids by the conversion of
rotational kinetic energy to the hydrodynamic energy of the fluid flow.
The rotational energy typically comes from an engine or electric
motor. In the typical case, the fluid enters the pump impeller along or
near to the rotating axis and is accelerated by the impeller, flowing
radially outward into a diffuser or volute chamber (casing), from where it exits.
These pumps move fluid using a rotating mechanism that creates a vacuum that captures and draws in the liquid. Rotary pumps are very efficient because they naturally remove air from the lines, eliminating the need to bleed the air from the lines manually.
Rotary positive displacement pumps fall into three main types:
A diaphragm pump (also known as a Membrane pump, Air Operated Double
Diaphragm Pump (AODD) or Pneumatic Diaphragm Pump) is a positive
displacement pump that uses a combination of the reciprocating action of
a rubber, thermoplastic or teflon diaphragm and suitable valves either
side of the diaphragm (check valve, butterfly valves, flap valves, or
any other form of shut-off valves) to pump a fluid.
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