PRIME 4 Installation and Operation Manual
Overview 1
1 Overview
The Smith Meter PRIME 4 meter is a rotary positive-displacement meter that measures product flow in
two directions. The accurately machined housing contains a rotor which revolves on tungsten carbide
bearings and carries two evenly spaced Polyketone blades. As liquid flows through the meter, the rotor and
blades revolve about a fixed cam, causing the blades to reciprocate. The successive movement of the
blades forms a measuring chamber of precise volume between the two blades, the rotor, the housing, the
bottom, and the top covers. A continuous series of these closed chambers is produced as the rotor
revolves. Neither the blades nor the rotor contact the stationary walls of the measuring chamber.
1.1 Principle of Operation
One of the outstanding features of the PRIME 4 meter is that product flow is undisturbed while it is being
metered. Energy is not wasted by unnecessary hydraulic bending of the liquid.
Unmeasured liquid (represented by the dark area in the drawing below) is shown entering the meter,
causing the meter’s rotor and blades to turn counter-clockwise. Blades A and B are fully extended, forming
the measuring chamber; the opposite ends of blades are retracted and flush with the rotor.
In the drawing below, the rotor and blades have made a one-eighth revolution. Blade A is fully extended;
blade B is partially drawn back; and the opposite end of blade B is starting to extend.
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