Pulsafeeder PulsaPro 900 EN - Manual (Page 10)

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2.2.3 Control Assembly
The output of the
PulsaPro 900
can be controlled by changing how far the piston moves
with each pump stroke. The Piston is attached to a rotating cam with a connecting rod. The
Control Assembly allows the throw of the cam to be adjusted (see Figure 5). The assembly
consists of the following parts:
e) Hand wheel
f) Threaded Shaft
g) Inner Stroke Adjust Shaft
h) Large and Small Plunger
i) Inner Cam
2.2.3.1 Operation
The output of the pump is varied by turning the Hand Wheel. The Hand Wheel turns a
threaded shaft. Depending on the direction of rotation, this either pulls the inner stroke
adjustment shaft towards the hand wheel or pushes it away. The inner stroke shaft includes
two opposite faces that are machined on an angle. A Large and Small Plunger ride on these
opposite faces. An Inner Cam rides over the plungers. As the position of the Inner Stroke
Adjustment Shaft changes, the Plungers shift from one side to the other causing the throw of
the cam to change.
Figure 5
The stroke length setting is denoted by a 0 – 100% scale with 2.5% increments. The scale is
located on the top part of the stroke control housing under a clear sealed cover.