Industrial seal self study guide - SKF.com

V-Ring Installation
These step-by-step procedures will assure correct SKF V-Ring installation:
• Clean the shaft and counterface. Make sure there is no grease or oil on
the V-Ring’s shaft seating surface.
• Apply a light coat of molycote, grease or silicone oil to the counterface
or lip. This will minimize break-in wear as well as maximize the
V-Ring’s service life.
• Mount the V-Ring by hand. It should be stretched uniformly around the
shaft (it can be stretched up to 2 1/2 times its molded diameter).
• On shaft diameters over 19.685 inches (500mm), run a blunt tool
between the V-Ring and the shaft to assure uniform stretch. Make
sure the V-Ring is located clear of housings or projections.
V-rings should be selected for the shaft size being used and mounted
on the shaft based on the “B 1 ” dimension, or distance from the rear
base of the ring to the surface its lip is contacting. It is called the
“width of seal” in the SKF Handbook. Other key installation dimensions
are the D2, or maximum gap between the shaft and housing and D3,
the minimum radial clearance around the V-ring.
While the V-ring can stretch to fit on the shaft, sometimes it is
necessary to cut the ring, fit it around the shaft and rejoin the ends.
It is possible to use cold or hot bonding methods, depending on the
operating conditions. SKF offers special instructions for bonding the
rings based on which compound is involved.
B1
V-Rings should be mounted to their
“B 1 ” dimension (fig. 8n).
8
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