Rotary Pump

A rotary pump is a positive displacement pump, where the movement of liquid from the inlet to the outlet of the pump is caused by rotary motion. Intended for industrial and commercial applications, a rotary pump is suitable for high pressure liquids and high viscosity liquids.

How does a Rotary Pump works?
A rotary pump operates on the principle of a rotating vane, rotating screw or forces on the gear trap’s pump casing on the suction side of the liquid and those on the pump casing on the discharge side. All rotary pumps have rotating parts which trap the fluid at the suction (inlet) port and force it through the discharge port into the system. Gears, screws, lobes, and vanes are commonly used to move the fluid.

They are designed with very small clearances between rotating parts and stationary parts to minimize slippage from the discharge side back to the suction side. They are designed to operate at relatively moderate speeds. Operating at high speeds causes erosion and excessive wear which results in increased clearances.

Types of Rotary Pump:
There are numerous types of rotary pumps and various methods of classification. A few of the most common types of rotary pumps are:

• Piston pumps
• Gear pumps
• Rotary Lobe pumps
• Screw pumps
• Diaphragm pumps

Applications of Rotary Pump
Rotary Pumps are are used in a variety of industries and applications. They are as follows :

• Pharmaceutical industry
• Pulp and paper industry
• Mining industry
• Power generation industry
• Food and beverage industry
• Chemical industry and biotechnology

Uses and Features of Rotary Pump

• Flow is independent of pressure. The flow can be changed without upsetting the pump's efficiency.
  
  
• It can handle high viscosity fluids efficiently.
• It is self priming.
• It is possible to get a smooth pulse free flow of the liquid into the system.



• It is also possible to get the desirable high head low flow combination that is needed in many high pressure applications.
  
  
• A rotary pump gives a non-shearing action that will not degrade sensitive petrochemicals and polymers.