About TurboClaw®

Compressor Technology Overview

Compressors are devices that pressurise fluids. There are two main types of compressor:
  1. Positive displacement compressors: Reciprocating compressors such as pistons in cylinders and diaphragm where the flow is controlled by valves; and Rotary such as screw, vane, and scroll where compression is achieved by rotors provided with lobes, gears, and vanes.
  2. Dynamic compressors: Turbomachinery in which compression is achieved by high speed impellers rotating in a confined case.
Turbomachinery can be categorised as follows:
  • Axial: the flow is compressed in the direction of the driving shaft; this is used for the highest flow rate applications.
  • Centrifugal: the flow is drawn in axially but directed radially, and the pressure rise is increased by centrifugal force; this is used for high flow rates at moderate pressure.
  • TurboClaw®: a new type of centrifugal compressor, developed by DBS, where the flow is drawn axially, directed radially, and delivered axially. This patented technology brings the benefits of turbomachinery to low flow rate applications.


TurboClaw® compressors offer a unique solution for low specific speed requirements, operating at much lower speeds than conventional turbocompressors. The lower operating speed eases problems with electric machine, drive as well as bearing support which traditionally hindered the use of turbocompressors in low flow rate applications. TurboClaw® benefits from low parts count, low manufacturing cost, oil free compression, low vibration and high efficiency – and enables these benefits to be realised in low specific speed applications.

TurboClaw® based compressors have been tested extensively to supply low flow rates at moderate shaft speeds. TurboClaw® achieves low flow-rates for a range of pressure ratios, at comparatively lower speeds of operation when compared to conventional turbomachinery. At low specific speed it achieves a similar or higher efficiency than both positive displacement and turbomcompressor technologies at a fraction of the cost.
TurboClaw Impeller

Advantages of TurboClaw®

  • Closer in efficiency to conventional turbomachinery than positive displacement machines.
  • High reliability inherent in relatively low speed, low parts count and single shaft operation.
  • Compact and oil-free operation.
  • Can be directly driven by an electric motor at a lower speed than conventional turbocompressors.
  • Does not require ultra-high speed bearing and motor/drive technology with associated cost and efficiency penalties.
  • Modest tip speeds with lower stresses enabling a wide range of manufacturing materials and process for lower cost.
  • Maintenance free operation, with only one non-contacting principal moving part required.
  • High temperature operation.
DBS patented geometry lends itself to use of conventional materials and mass manufacturing techniques.
Read on to hear about other key technology at the heart of DBS, our motors and controllers , or how this technology is applied to give significant advantages to our customers.