Dosing Process With Alternating Supply, and Associated Devices

A metering method for a multi-component coating product for application, the metering method comprising the following steps:

• supply of a metering device comprising a metering pump and a plurality of respective component product supply channels, the metering pump having an inlet and an outlet, the inlet being connected to the respective plurality of component product supply channels, each component product supply channel being provided with a respective valve, each valve having at least one closed configuration, wherein the valve prevents the passage of the corresponding component product to the inlet, and at least one open configuration, wherein the valve permits the passage of the corresponding component product to the inlet, the outlet being suitable for being connected to a coating product applicator;
• and
• suction by the metering pump of a volume during a suction phase of the metering pump, at least two of the respective valves being alternately, one after the other, in the open configuration during suction, so that the volume sucked-in during said suction phase alternately comprises a plurality of component products, wherein the suction comprises a suction cycle, said suction cycle being reiterated throughout the suction phase, at least two of the respective valves being one after the other in the open configuration during the suction cycle, and wherein, if at the end of a suction phase a suction cycle is in progress, the suction cycle resumes where it was interrupted, during a following suction phase.