PUMPS FOR SALE
FREE ESTIMATES PROVIDED
CALLAHAN AND Fernandina Nassau County 904-277-3040
Rotary Positive Displacement Pumps
These pumps move fluid using a rotating mechanism that creates a vacuum that captures and draws in the liquid
Advantages: Rotary pumps are very efficient because they naturally remove air from the lines, eliminating the need to bleed the air from the lines manually.
Drawbacks: The nature of the pump requires very close clearances between the rotating pump and the outer edge, making it rotate at a slow, steady speed. If rotary pumps are operated at high speeds, the fluids cause erosion, which eventually causes enlarged clearances that liquid can pass through, which reduces efficiency.
Rotary positive displacement pumps fall into three main types:
- Gear pumps – a simple type of rotary pump where the liquid is pushed between two gears
- Screw pumps – the shape of the internals of this pump is usually two screws turning against each other to pump the liquid
- Rotary vane pumps – similar to scroll compressors, these have a cylindrical rotor encased in a similarly shaped housing. As the rotor orbits, the vanes trap fluid between the rotor and the casing, drawing the fluid through the pump.
Positive displacement types
A positive displacement pump can be further classified according to the mechanism used to move the fluid:
- Rotary-type positive displacement: internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, flexible impeller, helical twisted roots (e.g. the Wendelkolben pump) or liquid-ring pumps
- Reciprocating-type positive displacement: piston or diaphragm pumps
- Linear-type positive displacement: rope pumps and chain pumps
PUMPS FOR SALE
FREE ESTIMATES PROVIDED
CALLAHAN AND Fernandina Nassau County 904-277-3040
Address:
Callahan Pumps
5508 Wilmin Way
Suite # 4
Zip Code: 32207
