This is a closeup of the pressure regulator. As the air pressure builds up,
the yellow piston will raise. The blue angled pieces connect to a Lego
polarity reversal switch. These switches have a dead zone, and when the
pressure is high enough, the switch enters the dead zone and the pump motor
turns off. When the pressure drops, the red elastics pull the piston down and
cause the switch to reactivate the pump motor. This is basically just a copy
of Ralph Hempel's design.
Smaller...
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