The Main difference between Dynamic displacement pump and Positive displacement pump are as follows:
- Flow rate: Dynamic displacement pumps (such as centrifugal pumps) have variable flow rate, while positive displacement pumps (such as gear pumps and diaphragm pumps) have a fixed flow rate.
- Head pressure: Dynamic displacement pumps typically generate high head pressures, while positive displacement pumps generate lower head pressures.
- Efficiency: Positive displacement pumps are typically more efficient than dynamic displacement pumps at low flow rates.
- Suction lift: Positive displacement pumps have a higher suction lift than dynamic displacement pumps, making them suitable for applications where the liquid level is below the pump inlet.
- Viscosity: Positive displacement pumps are better suited for pumping liquids with high viscosities, while dynamic displacement pumps are better suited for pumping low viscosity liquids.
- Solids handling: Positive displacement pumps can handle solids and particles in the liquid, while dynamic displacement pumps can be damaged by the presence of solids in the liquid.
- Maintenance: Positive displacement pumps typically require more maintenance than dynamic displacement pumps.
- Temperature: Positive displacement pumps can handle liquids at higher temperatures than dynamic displacement pumps.
- Pressure: Positive displacement pumps can handle higher pressure than dynamic displacement pumps.
- Cost: Positive displacement pumps tend to be more expensive than dynamic displacement pumps.
