Graphs of modelling of the vacuum gage pressure oscillation Δp_vp in the vacuum pipeline of milking machine in dependence of quantity of the milking units N ⁺_nmu with the coincidence in time of the phase and work times of pulsator with probability of P(N_nmu) for diameter of vacuum pipeline D: a – D = 25,4 mm, milking unit with pneumatic pulsator; b – D = 40 mm, milking unit with pneumatic and electric pulsator of the pair-wise action; c, d – D = 50 mm, milking unit with pneumatic and electric pulsator of the pair-wise action.