3. Overview/functional description
3.4.1 Functioning of a VP 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 progressive
metering device. The specified portions are
generated through the piston movement.
Two lubricant outlets on the two end posi-
tions of the piston travel are allocated to
each piston.
A progressive metering device contains
between 3 and 10 pistons. If lubricant is
pressure-fed, the pistons of a progres-
sive 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 progressive 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 portions for
both outlets are determined by the diameter
and the travel of the piston. The selection
of the required portion is made during the
design of the progressive metering device.
Retrofitting of the progressive metering de-
vice also changes all portions.
Fig. 5 Consolidation of outlets
X
X
X
X
Example: 2S = 0.4 cm³ per cycle from one outlet
3S = 0.6 cm³ per cycle from one outlet
6S = 1.2 cm³ per cycle from one outlet
Example: 2T = 0.2 cm³ per outlet
3T = 0.3 cm³ per outlet
6T = 0.6 cm³ per outlet
Example:
2SC
= 0.8 cm³ per cycle from one outlet
2SC
T (twin) = two outlets
S (single) = one outlet
C (crossporting)
Consolidation of the four piston displacements to form one
outlet
Borehole
Plug screw
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951-230-008-EN
Version 04
EN
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