Research, Calvin Bekker, originally from Durban South Africa but now here in the UK, owns the patents. His website is...

http://www.hysave.com/

Even with head pressures floated lower - EEV's tend not to need the pressure boost given by the pump so the pump is generally not needed for close coupled systems so long as the drainage from condenser to EEV is cleverly thought-out. But for remote evaporators either at the same level as the receiver or higher than the receiver you need a liquid delivery system to ensure a solid bore of liquid is delivered to the expansion device inlet at all times. None the less stable EEV and Condenser capacity is still required though less so than without the delivery system. The Assembly in the image is simply called a Liquid Delivery System or LDS.