6 Functional Description
6.1
Liquid End
The dosing process is performed as follows: The diaphragm is pressed
into the dosing head; the pressure in the dosing head closes the suction
valve and the feed chemical flows through the discharge valve out of the
dosing head. The diaphragm is now drawn out of the dosing head; the dis‐
charge valve closes due to the negative pressure in the dosing head and
fresh feed chemical flows through the suction valve into the dosing head.
One cycle is completed.
6.2 Drive unit
The diaphragm is driven by an electromagnet, controlled by an electronic
control.
The drive technology on the gamma/ X enables the timed progress of the
flow to be precisely matched to the requirements of the particular applica‐
tion.
This ensures that the user can set the optimum discharge stroke for his
application, as required:
Pos.* Discharge
stroke
Application
A.
‘optimum’
For maximum accuracy when metering and
the very best results with internal pressure
measurement and special functions.
B.
‘fast’
For as fast a discharge stroke as possible -
the duration of the discharge stroke is
dependent on the stroke rate.
C.
‘Sine mode’
For a long, sine-shaped discharge stroke -
the duration of the discharge stroke is
dependent on the stroke rate.
D.
‘continuous’
For a continuous discharge stroke e.g. for
bottling processes. The duration of the dis‐
charge stroke is dependent on the stroke
rate.
E.
‘DFMa’
For optimum operation with a flow meter Dul‐
coFlow
®
DFMa.
* see following drawing.
Drive technology
Functional Description
20
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