Classification of Pumps
|Classification of Pumps|
- Single-stage,single-entry pumps are adequate for lower capacity applications,and for higher duties the single stage.double entry type of pump is favoured for higher efficiency.
- Pumps with more than 2 stages are usually referred to as multi-stage pumps.
- In some unique cases,where high pressure requirements are needed.pumps can have more than 8 stages.It is common for multi-stage machines to have radially by reciprocating or rotary action.
- Rotary-type positive displacement pump:
- Internal gear pump
- Screw pump
- Reciprocating-type positive displacement pump:
- Piston pump
- Diaphragm Pump
Rotary-Type Positive Displacement Pump
- Gear pumps - a simple type of rotary pump where the liquid is pushed between two gears.
- Rotary vane pumps - similar to scroll compressors, these pump have a cylindrical rotor encased in a similar shaped housing. As the rotor orbits, the vanes trap fluid between the rotor and the casing, drawing the fluid through the pump.
Reciprocating-Type Positive Displacement Pump
- Plunger pumps - a reciprocating plunger pushes the fluid through one or two open valves, closed by suction on the way bac
- Diaphragm pumps - similar to plunger pumps, where the plunger pressurizes hydraulic oil which is used to flex a diaphragm in the pumping cylinder. Diaphragm valves are used to pump hazardous and toxic fluids.
- Piston displacement pumps - usually simple devices for pumping small amounts of liquid or gel manually.
|Piston Displacement Pump|