Mixing system for color components and method for producing coated paper or board

The invention relates to a mixing system comprising a mixing device (1) with inlet (2) and drain pipe (3), wherein a pressure control valve (5) is arranged in the discharge line (3) and the discharge line (3) upstream of the pressure control valve (5 ) (via a bypass line 4) with the feed line (2) is connected. Furthermore, the invention relates to a process for the production of coated paper or paperboard, wherein a coating color, in particular using the mixing system of the invention is applied to a paper or board web.