The study analyzed changes of vacuum and the range of vacuum amplitude in a milk line of a tube milking unit. Two manners of connecting six milking machines to the installation of the milking machine were used. Milking machines were connected successively, beginning with the first stand tap lying the closest to the final unit, and then beginning with the sixth stand tap found the furthest in relation to the final unit for two configurations of the milk line (arm and arm with the wash supporting line) and for three systems of vacuum regulation. The studies showed a significant influence of the total liquid stream from the milking machines Qmr, the mean velocity of the flowing liquid vcśr and a configuration of the milk line on the drop and range of vacuum amplitude aP14 in the transport zone of the milk line. The decrease of vacuum in the transport zone for the configuration of the milk line - arm, with full loading of the installation was 5 kPa, and the range of its amplitude was about 8 kPa. For the configuration of the milk line arm with a wash supporting line the drop of vacuum was 2 kPa, and its range of amplitude - about 6 kPa. In the section of the milk line with the working cluster, drops of vacuum were significantly dependent on the quantity of the flowing liquid Qmr and on the appearing "thresholds of liquid" at the stand taps. The range of vacuum amplitude aP14 in the milk line in the section with the working cluster changed from 1 to 9 kPa.
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