Abstract: Apparatus for metering liquids includes a tank for liquid being metered, a pipe for drawing off the liquid, having an end nozzle. A recirculation pipe communicates with the pipe and the tank. A reversible pump operable in suction or compression mode includes a non-return valve to close the recirculation pipe to draw off metered liquid and open the recirculation pipe, closing the pipe when the pump is in compression mode. A shut-off valve communicates with the pump, the delivery nozzle and the pipe for closing in the delivery nozzle direction and for opening in the pump direction, to allow, in suction mode, drawing a metered quantity of liquid and, in compression mode, selective recirculation of the liquid. At a second position in compression mode, the valve opens in the delivery nozzle direction and closes the pipe to deliver a metered quantity of liquid into a storage container.

Abstract: Apparatus for metering one or more liquids includes at least one tank (2) for the liquid to be metered, a pipe (6, 6b)) for drawing off the liquid, having an end nozzle (8) for delivery of the liquid to a storage container. A recirculation pipe (10) communicates with the draw-off pipe (6, 6b) and with the tank (2) for recirculating to the tank the liquid to be metered A reversible pump (18) is associated with the draw-off pipe and operates in suction or compression mode, and includes a non-return valve (16a, 16b) associated with the recirculation pipe (10) to close the recirculation pipe when the pump (18) is operated to draw off a metered quantity of the liquid and open the recirculation pipe, closing the draw-off pipe when the pump is operated in compression mode.

Abstract: The device (10) comprises a substantially stationary outer frame (14) and a movable inner frame (18) supported by the outer frame (14). The inner frame (18) is provided with a lower support plate (26) for a receptacle (C) containing the product to be mixed and with an upper clamping plate (30) which can be moved towards the inner plate (26) to clamp the receptacle (C). The lower and upper plates (26, 30) are both rotatably mounted about a vertical axis (Z). The device comprises a first electric motor (32), first driving means (38, 40, 42, 44, 45) arranged to impart a vertical oscillation movement to the receptacle (C) and second driving means (38, 40, 42, 58, 60, 56, 54, 52, 48, 26) arranged to impart a rotational movement about a vertical axis (Z) to the receptacle (C) at the same time as the vertical oscillation movement. The first and second driving means are both operated by the first electric motor (32).

Abstract: Apparatus for metering one or more liquids contained in respective reservoirs (2, 6) into one or more collecting containers is characterized in that it comprises, for each liquid: a cylinder (2) for the liquid to be metered, the cylinder having a movable piston member (8) in contact with the surface of the liquid in the cylinder (2), pressure means (12) for exerting a constant force on the piston (8), means (14, 16, 18, 20) for the transfer of the liquid from the cylinder (2) to the collecting container, the transfer means comprising a duct having an inlet opening (16) for the withdrawal of the liquid from the cylinder and a delivery opening (20), the transfer means being movable in dependence on the level of liquid in the cylinder (2) and being arranged to keep the geometrical height difference H1 between the withdrawal point and the delivery point proportional to the hydrostatic head of liquid H2 above the withdrawal point with variations in the level of liquid in the cylinder so as to keep the delivery flo