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APPENDIX A
PRINCIPLE OF OPERATION
The Smith Meter is of the Rotary Positive Displacement Type. The accurately machined housing contains a rotor
which revolves on ball bearings and carries evenly spaced blades. As liquid flows through the Meter, the Rotor and
blades revolve about a fixed cam, causing the blades to move outward. The successive movement of the blades forms
a measuring chamber of precise volume between two of the blades, the rotor, the housing, the bottom and top covers. A
continuous series of these closed chambers is produced, for each rotor revolution. Neither blades nor Rotor contact the
stationary walls of the measuring chamber.
One of the outstanding features of the Smith Meter principle is that the flow is literally undisturbed while it is being
metered. Energy is not wasted by arresting liquid velocity; consequently high accuracy and efficiency are commonplace
with Smith Meters.
A9-34
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