A geared volumetric machine comprising: - a first and a second door ; the second door operating at a greater pressure than the first door ; one from between the first and second door being an inlet door of a fluid into the volumetric machine and the other door being an outlet door of the fluid from the volumetric machine ; - a first cogged wheel in turn comprising a first and a second lateral flank ; - a second cogged wheel enmeshing with the first cogged wheel ; said first wheel comprising a plurality of teeth defining between them a plurality of compartments destined to house teeth of the second wheel ; - a first and a second abutment between which the first cogged wheel is interposed and which respectively face the first and the second lateral flank of the first cogged wheel ; - a first grooved pathway which at least in a first angular position of the first cogged wheel connects a first and a second zone , the first zone comprising at least one of the compartments which is in communication with the second door , the second zone being a locus of points interposed between the first abutment and the first flank ; characterised in that said first grooved pathway comprises at least one stretch having a passage section having a surface smaller than 1 mm 2 ; a)in each angular position of the first wheel said first grooved pathway connects the first zone and each passageway located at a corresponding interface existing between: i) at least 75% of the teeth of the first wheel in communication with the second door and ii) the first abutment ; the first grooved pathway at least partly extends between a radially nearer position and a radially more distant position from a rotation axis of the first cogged wheel ; or b) it comprises a plurality of grooved pathways which in combination, in each angular position of the first wheel , connect the first zone and each fluid passageway located at an interface existing between: i) at least 75% of the teeth of the first wheel in communication with the second door and ii) the first abutment ; each of said grooved pathways at the second zone , at least partly extends between a radially nearer position and a radially more distant position from a rotation axis of the first cogged wheel ; said plurality of grooved pathways comprising the first grooved pathway . - a first and a second door ; the second door operating at a greater pressure than the first door ; one from between the first and second door being an inlet door of a fluid into the volumetric machine and the other door being an outlet door of the fluid from the volumetric machine ; - a first cogged wheel in turn comprising a first and a second lateral flank ; - a second cogged wheel enmeshing with the first cogged wheel ; said first wheel comprising a plurality of teeth defining between them a plurality of compartments destined to house teeth of the second wheel ; - a first and a second abutment between which the first cogged wheel is interposed and which respectively face the first and the second lateral flank of the first cogged wheel ; - a first grooved pathway which at least in a first angular position of the first cogged wheel connects a first and a second zone , the first zone comprising at least one of the compartments which is in communication with the second door , the second zone being a locus of points interposed between the first abutment and the first flank ; i) at least 75% of the teeth of the first wheel in communication with the second door and ii) the first abutment ; i) at least 75% of the teeth of the first wheel in communication with the second door and ii) the first abutment ; <EOS>