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3. Overview, functional description
In its principle the change-over device corre-
sponds to a pressure-controlled 4/2-way valve.
It alternately dispenses the lubricant fed by the
pump to one of the two main lines while the
other main line is connected to the return line
connection of the pump.
Figures 1 and 2 show a schematic of the
change-over device's function. The lines marked
in black are pressure lines, the white lines are
relief lines:
Pressurized line
Line relieved from
pressure
Control lubricant
The centralized lubrication pump feeds the
lubricant via the pressure line (5) to the change-
over device. The lubricants moves via the pre-
selection piston (2), the change-over piston (1)
and through the main line (7) to the lubricant
metering devices, while the main line (8) is
connected to the reservoir of the centralized lu-
brication pump via the relief line (6) and is thus
depressurized.
Overview Fig. 1
3. Overview, functional description
