Abstract: A pumping device arranged in a compact assembly that can be installed quickly and easily. The pumping device comprises a centrifugal electric pump, a pressurized vessel, and a manifold, wherein the pump, the vessel, and the manifold are enclosed in a single box-like body. The pump has two intake connectors arranged along perpendicular directions, and the pressurized vessel, for a delivery liquid, is fixed to the pump with an axis of symmetry that is parallel to the axis of the pump. The manifold has a one-way valve and is configured to distribute the delivery liquid to the pressurized vessel and to one of two delivery connectors that are oriented along perpendicular directions and are to be connected selectively or simultaneously to a hydraulic system. The intake connectors and the delivery connectors being in a single portion of the pumping device.

Abstract: A centrifugal pump with facilitated self-priming, which comprises a casing with a suction inlet and a discharge outlet and with an internal series of diffusers and impellers, which form a cylindrical assembly that forms, together with the casing, an annular interspace which is connected to the inside of the series of diffusers and impellers on the discharge side through corresponding openings and on the inlet side through a hole arranged perimetrically in the intake region; the hole is controlled, on the side of the interspace, by a normally-open flexible metallic laminar valve. A wall of the pump struck by the fluid exiting from the interspace through the controlled hole is shaped so as to have a double symmetrical channel for imparting to the fluid a double vortex before passing through the first impeller.

Abstract: A turbine pump impeller provided with vanes of the double-curvature type, obtained monolithically by die casting and comprising, between two disk-shaped elements, a plurality of double-curvature vanes. In each vane, the two surfaces that are struck by the fluid are obtained from a sequence of transverse curved portions formed by circular arcs centered on a common spatial central axis.