Patent ID: 8365780

Claim:
A method for filling containers ( 2 ) with liquid comprising the following steps, wherein the container ( 2 ) is filled with the liquid and a gas displaced by the liquid out of the container ( 2 ) escapes via a return gas path ( 9 ); the container ( 2 ) is passed through a quality control station before or after a closing operation for determining deviations from predetermined quality assurance criteria; deviations from one of a predetermined process sequence or predetermined quality assurance criteria are detected during the filling operation or during the quality control of the container ( 2 ) according to at least one of the following criteria, wherein a filling end does not comply with a predetermined desired value; —a filling duration does not comply with a predetermined desired value; —a filling level does not comply with a predetermined desired value; —a measure of the liquid throughput does not comply with a predetermined desired value; and/or—a formation of foam does not comply with a predetermined value, and, if at least one of the criteria is fulfilled, the return gas path ( 9 ) is cleaned by blowing off with a gas jet or by way of one or several air blasts through the return gas path ( 9 ); and if none of the criteria is fulfilled, cleaning of the return gas path is not carried out.