| 摘要 |
A vacuum pulsator for milking machines comprises a pair of valves controlling the alternate application of vacuum and air pressure in a line connected to the pulsator, the pulsator including adjustable bleed valves operative to control the frequency of alternation and/or the phase length of alternation of vacuum and air pressure. The pulsator may be subject to compressed air or atmospheric air, and the bleed valves are adjustable externally of the pulsator body.
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