Pump; Types of Pump;

• Pump
  The hydraulic machines which convert the mechanical energy into hydraulic energy are called pumps.
   
• Pumps are in general classified as Centrifugal Pumps (or Roto-dynamic pumps) and Positive Displacement Pumps.
   
• Centrifugal pumps can be classified further as
  • end suction pumps
  • in-line pumps
  • double suction pumps
  • vertical multistage pumps
  • horizontal multistage pumps
  • submersible pumps
  • self-priming pumps
  • axial-flow pumps
  • regenerative pumps
   
• The positive displacement pump can be classified as:
  • Reciprocating pumps - piston, plunger and diaphragm
  • Power pumps
  • Steam pumps
  • Rotary pumps - gear, lobe, screw, vane, regenerative (peripheral) and progressive cavity