| 摘要 |
An underpressure pulsator for milking machines is described, which contains a valve pair which controls the alternate supply of underpressure and overpressure to a line which is connected to the pulsator. The pulsator contains adjustable vent valves which influence the frequency of the pressure change and/or the phase length of the change between underpressure and overpressure. The pulsator can be operated with compressed air or air at atmospheric pressure. The vent valves can be adjusted from outside.
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