Fluid pressure intensifier device

In a fluid pressure intensifier device having a plurality of piston and cylinder compression stages of sequentially decreasing volume, flow passages for conducting fluid to be pressure intensified sequentially through said stages, and means for operating said stages in sequence to effect stagewise pressure intensification of fluid, the improvement comprising an individual pressure fluid powered driving mechanism for each said piston and cylinder compression stages, each of said driving mechanisms comprising a driving piston and cylinder assembly integrated with the compression stage associated therewith, said compression stages being arranged in a circle about an axis, and control means for causing said driving mechanisms to operate in sequence, said control means comprising a port plate rotatable about said axis and controlling pressure fluid inlet and outlet connections to the driving piston and cylinder assemblies, a positive displacement pressure fluid motor actuated by the pressure fluid powering said driving piston and cylinder assemblies for rotating said port plate, said positive displacement motor comprising a gerotor motor having an outer gear comprising said rotatable port plate.