Nasta Compressed Air Services

Pumps that Make Use of Positive Displacement

Positive displacement is a fairly simple, albeit a powerful concept that is widely used for pumping mechanisms in industrial processes all over the world. The variety of applications for this type of technology are so wide, in fact, that no single type of pump uses it exclusively. The tech is used in a number of different pumps, all forming the staple for whichever industrial process it is being used in. To demonstrate this point, here are a few different types of pumps that operate through positive displacement.

Screw Pumps

A screw pump is a fairly complicated rotary pump. It uses a few screws that have opposing threads that are mounted on shafts, parallel to each other and designed to turn together. These screws are turned in their shafts during operation in order to drive fluid through the pump, affording minimal clearance between the moving parts and the casing of the pump itself.

Rotary Lobe Pumps

Because they can handle solids as well as liquids, and operate under sanitary conditions, rotary lobe pumps are often used in food processing, but they have a massive range of other industrial applications including paper production. They also offer a fairly gentle pumping action which also helps them to serve the abovementioned purposes. They operate much like gear pumps with the exception that the lobes do not make contact during operation.

Hydraulic Pumps

Hydraulic pumps, as their name would imply, converts mechanical energy into hydraulic energy by generating flow through pressure induced by the load at the pump’s outlet.  This creates a vacuum at its inlet, which forces liquid to it  and into the hydraulic system.

Contact Nasta Compressed Air for Details

Here at Nasta Compressed Air, we have a variety of pumps and air compressors for sale in Johannesburg. So give us a call today to find out about sourcing your own equipment, or visit our website to see more of what we have on offer.


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