Abstract: A pump includes a body, an actuating shaft, on which at least a first impeller and a second impeller are axially mounted, a fluid intake duct and a fluid delivery duct. The pump further includes front and rear chambers, first and second volutes, first and second discharge orifices and a channel inside the body for throughflow of fluid to the second impeller.

Abstract: Volumetric blower comprising an internally hollow body (11) for defining a compartment (12) which is placed in communication with an intake manifold (30) and a delivery manifold (31) and which has, arranged inside it, two rotors (20) which are parallel to a longitudinal axis (X—X) of the blower, counter-rotating and shaped in the manner of lobes (21) having a correlated profile and which are designed to produce, together with the internal wall (11a) of said compartment, the periodic formation of a chamber (40) containing the fluid to be conveyed to the delivery manifold (31), the opposite openings in the longitudinal direction of said compartment (20) being closed by an associated cover (50), wherein the internal surface (51) of said covers (50) has, formed in it, at least one duct (52;152) arranged, with respect to the longitudinal axis (X—X), on the side corresponding to the delivery manifold (30) so as to allow connection of said chamber (40) to the delivery manifold itself and designed to be c