The study presents modelling of subpressure in the milk chamber of the collector for changes of the milk flow diameter of 0, 1, 2, 3 mm. Computer simulation was made using Matlab^® Simulink software. The study was performed in the aspect of works on the automatic control of the milking apparatus for cows. Results of the simulation have been presented in diagrams which indicate that for the milk flux diameter of 0, 1, 2 and 3 mm, the sequences are of similar character. On this basis, a conclusion was drawn that changes of airflow volume caused by the change in milk flow diameter do not influence the value of subpressure changes in the milk chamber of the collector.

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