METERING AND DOSING APPARATUS

摘要

An apparatus for charge-wise dosing a metered volume quantity of liquid medium to be supplied continuously under delivery pressure, comprising a pair of serially connected cylinder-and-piston assemblies of different diameters the cylinder blocks being arranged axially relatively to each other, forming a composite housing; a supply conduit for the flowing medium connected to the smaller diameter cylinder block and a filling nozzle connected to the larger diameter cylinder block and containing a discharge opening; a tube operating as a piston member for reciprocation in the composite housing, which tube is in direct communication with the smaller diameter cylinder block and connected to the larger diameter cylinder block via a passage provided in the larger diameter piston. The tube operating as piston member carries at least the larger diameter piston; a first valve by means of which the passage in the larger diameter piston is closable and a second valve by means of which the access to the filling nozzle is closable; and an assembly for operating the valves and controller therefor.