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951-180-083-EN
Version 01
EN
3. Overview, functional description
3.6.1 Functioning of a VPB progressive metering device
The task of the progressive metering device
is to consecutively distribute specified por-
tions of the pressure-fed lubricant (grease
or oil) to the connected lubrication points.
The lubricant continues to discharge as
long as it is pressure-fed to the progres-
sive metering device. The specified portions
are metered by the piston movement. Two
lubricant outlets on the two end positions of
the piston travel are allocated to each pis-
ton. If lubricant is pressure-fed, all pistons
of a metering device move sequentially to
their end position. The piston movement
displaces a portion of the lubricant that is
upstream of the piston to the downstream
outlet. A piston can start moving only after
the upstream piston has been moved to its
end position. If all pistons are in their left
or right end position, internal connecting
bores in the metering device ensure that the
pistons continue running reliably as defined.
When all pistons have been moved once to
the left end position as well as to the right
end position, all connected lubrication points
have been supplied once with the preset
lubricant quantity. The metered volumes for
both outlets are determined by the diameter
and the travel of the piston. The selection
of the required metered volume is made
during the design of the metering device. A
Plug
917-006-101
(hexagon socket WAF 3)
Plug screw
466-431-001 for VPBM
466-419-001 for VPBG
Lubricant
inlet
subsequent change of the portions is only
possible through modification of the meter-
ing device.
Fig. 10 Sectional view of a VPB metering device
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