Positive displacement pump
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- A positive displacement pump moves a fluid by repeatedly enclosing a fixed volume and moving it mechanically through the system.
- The pumping action is cyclic and can be driven by piston, screws, gears, rollers, diaphragam, or vanes.
How does positive displacement pump works?
Although there are a wide variety of pump designs, majority can be places into two different categories
- Reciprocating pump
- Rotary pump
What are the main features and benefits of positive displacement pump?
There are two main families of pumps
- Positive displacement pump
- Centrifugal pump
Centrifugal pumps are cabaple of higher flows and can work with lower viscosity liquids. In some chemical plants 90 percentage of pumps used centrifugal pumps. However there are number of applications for which positive displacement pumps can be preferred.
For example they can higher viscosity fluids and can operate at high pressure and relatively more flows efficiently. There are also more accurate when metering is a very important consideration.
Applications of positive displacement pump
- Positive displacement pump commonly used for pumping high viscosity fluids such as oil, paints, resins and foodstuffs
- This pump is preferred in any application where accurate dosing or high pressure output is required.
- Unlike centrifugal pump, the output of positive displacement pump is not affected by pressure so they also tend to be preferred in any situation where the supply is not regular
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