SKF LINCOLN VP Series, Руководство по эксплуатации

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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 metering device contains between 3 and
10 pistons. If lubricant is pressure-fed, the
pistons of a metering device move sequen-
tially to their end position. The piston move-
ment displaces a portion of the lubricant
that is upstream of the piston to the down-
stream 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 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 metering device. Retrofitting of the
metering device also changes all portions.