The "Articulated Displacer Compressor" represents a radical new design in compressor engineering. This unique, patented design is now available for licensing or purchase.
Basic info: 

A rotary gas compressor 

Suitable for heavy duty continuous or intermittent operation

Automatic inlet and outlet pressure control valves

Reduced power consumption and increased volumetric efficiency. 
Articulated volume displacers:

........further increases volumetric efficiency

........extends life of wearing components ..

........Permits infinitely variable capacity control from 0 to 100%.

High loads and high speeds are possible due to intrinsic radial load balancing. 

Additional provisions include replaceable cylinder liners.