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951-180-083-EN

Version 01

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.

SKF VP Series User Manual

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