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* Animation demonstrates process.
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Continuous vacuum applied to the teat will quickly cause swelling
which can prevent milk flow and eventually damage the teat. To overcome
this, alternating levels of vacuum and atmospheric pressure are
allowed into the space between the flexible liner and the shell
of the teat cup. The difference in air pressure between the vacuum
level within the liner and atmospheric air pressure outside the
liner cause it to collapse and massage the teat which is the same
action as suckling by the calf. This reduces the swelling at the
teat end. The pulsator alternately allows air at atmospheric pressure
into the space between the liner wall and shell.
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