3. Overview/functional description
3. Overview/functional description
3.1 Overview of progressive metering devices
Figure 1 shows the VP, VPK, VPB, series of
SKF progressive metering devices with their
inlet volumetric flow data.
3.2 Information on volume data
In progressive metering devices, the nomi-
nal volume is indicated per stroke. This is
calculated from the piston diameter and the
maximum possible stroke of the particular
metering piston, the maximum stroke. The
maximum achievable piston capacity is typi-
cally used as the nominal volume when con-
figuring a progressive metering device,
though the movement of the piston is influ-
enced by various factors such as:
○ Differences in back pressures at the
outlets, for example due to long tubing
lengths or connected roller bearings or
shaft bearings.
Fig. 1 Type and size
150
200
400
45
500
2 500
1 000
1 200
700
VP
VPK
VPB
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