Abstract: A pelleting press for pressing from a powdery, granular and/or pasty material compacted rod-shaped pieces of said material, comprising a die (1) with one or more rotatable rolls (6) co-operating therewith each having an axis (5) supported in such a manner that it is situated in a plane through the axis (3) of the die (1) and a gap (9) is defined between the die (1) and the or each roll (6), further comprising means for supplying the material to be pressed towards the or each gap (9), and driving means for moving the die (1) and the or each roll (6) in respect of the material supplied to the or each gap (9), all this in such a manner that the supplied material when moving in the gap between the die and a roll is compacted and is pressed through the apertures (2), the support of the die and/or the or each roll being so that the gap height is adjustable, the driving means being adapted for driving the die as well as the or each roll, and the velocity of at least the die or the each roll being independently varia

Abstract: In an external or internal gear pump or gear motor with one pair of helical spur gears, the trapping of fluid in the enclosed tooth cavity and the risk for cavitation in the said enclosed tooth cavity is considerably reduced by the shift of the pressure port connected and the suction port connected relief grooves at the leading lateral face of the helical gears in the direction of the suction port and the shift of the pressure port connected and suction port connected relief grooves at the lagging lateral face of the helical gears in the direction of the pressure port.