A process and device for controlled feeding of incoherent solid materials for differentiated pressure systems along a pipeline through the pressure of a fluid in the gaseous state. The pipeline is obtained by combining a plurality of consecutive trunk sections. The device includes a mechanism for intermittent feeding of the incoherent solid material in the pipeline, a mechanism for feeding the gaseous fluid under pressure in a plurality of predefined feeding points of the pipeline, a first series of valve members applied to each trunk section for intercepting the pipeline under control, a second series of valve members applied to each trunk section for allowing the escape of the expanded gaseous fluid from the pipeline and centralized control for closing the first series of valve members and for the concurrent opening of the second series of valve members. The feeding mechanism for the gaseous fluid under pressure can introduce the gaseous fluid under pressure in each feeding point of the pipeline when the first valve members located upstream of the feeding point are closed and the first valve members located downstream are open, and when the second valve members located upstream of the feeding point are open and the second valve members located downstream are closed.