Metering system for a fluid medium, in particular urea-water solution

摘要

The dosing system has a pneumatic diaphragm pump (312), a four- or two-way valve (302) and a phase mixer (303). The four- or two-way valve connects a chamber (311) of the diaphragm pump with a compressed air supply (301) in a switching position, and connects an input (319) of the phase mixer with the compressed air supply in another switching position. A discharge side of the diaphragm pump is connected to another input (316) of the phase mixer, where an output (317) of the phase mixer is connected to a spray pipe (304). Independent claims are included for the following: (1) a method for operating fluid medium dosing system; and (2) a control device for operating fluid medium dosing system.