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Aug 8, 2016 · Below is a quick comparison table that highlights the main performance differences between centrifugal (rotodynamic) pumps and positive displacement pumps. Impellers pass on velocity from the motor to the liquid …
The Main difference between Centrifugal pump & Positive displacement pump are as follows. Principle of operation: Centrifugal pumps use centrifugal force to move fluid, while positive displacement pumps use a mechanical means, such as a
Difference Between Centrifugal Pump and Positive Displacement
Centrifugal pumps and positive displacement pumps are two common types of pumps used in various industries for fluid transfer applications. The main difference between these two types of pumps lies in their operating principles and performance characteristics.
Centrifugal pumps work based on the principle of centrifugal force, where a rotating impeller imparts kinetic energy to the fluid, causing it to move radially outward. On the other hand, positive displacement pumps operate by trapping a fixed volume of fluid and then displacing it through the pump's discharge outlet.
Positive Displacement Pump Disadvantages
While positive displacement pumps offer several advantages, such as the ability to handle high viscosity fluids and maintain a constant flow rate, they also have some disadvantages. One of the main drawbacks of positive displacement pumps is their sensitivity to changes in system pressure, which can lead to issues such as cavitation and pump damage.
Positive Displacement Pump vs. Diaphragm
A positive displacement pump can come in various designs, including diaphragm pumps. Diaphragm pumps use a flexible diaphragm to create a chamber that expands and contracts, drawing in and expelling fluid. These pumps are commonly used in applications where the pumped fluid needs to be isolated from the pump components.
Characteristics of Positive Displacement Pump
Positive displacement pumps have several key characteristics that set them apart from centrifugal pumps. These include the ability to provide a constant flow rate regardless of system pressure changes, the ability to handle high viscosity fluids, and the ability to generate high pressures with low flow rates.
Positive Displacement Pump Working Principle
The working principle of a positive displacement pump involves trapping a specific volume of fluid in a chamber and then displacing it through the pump's discharge outlet. This process ensures a continuous and consistent flow of fluid, making positive displacement pumps ideal for applications where precise flow control is required.
Centrifugal Pump vs. Submersible
Centrifugal pumps and submersible pumps are both types of centrifugal pumps, with the main difference being that submersible pumps are designed to be fully submerged in the fluid being pumped. This design allows submersible pumps to operate more efficiently in applications where the pump needs to be located below the fluid level.
Centrifugal Pump vs. Rotary
Another common type of positive displacement pump is the rotary pump, which operates by trapping fluid in cavities formed by rotating elements such as gears, lobes, or vanes. While centrifugal pumps rely on the centrifugal force generated by a rotating impeller, rotary pumps use mechanical means to displace fluid, making them suitable for handling viscous fluids.
Positive Displacement Diaphragm Pump
This is a detailed comparison of the Positive Displacement pump vs Centrifugal pump. Learn which pump type suits your applications.
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basic difference between centrifugal and positive displacement pump|characteristics of positive displacement pump