Rotary Seals - Dilanda.it

Axial Shaft Seal
n Applications
Fields of application
Axial shaft seals are used for sealing shafts, axles and
bearings. Their function is to prevent the ingress of dust,
dirt, splash water, etc., and to prevent the escape of fluid or
lubricant from the sealed chamber.
The fields of application of the individual types differ
widely and are predominantly dependent on the type of
lubricant and the operating conditions.
Technical data
Operating pressure:
Speed:
pressureless
Up to 30 m/s, depending on
type and elastomer material
Peripheral speed and rotational speed
To maintain acceptable heat generation and wear of the
sealing lip, the peripheral speed must be limited according
to the elastomer grade used. The peripheral speed at the
sealing lip must not exceed the following values:
Type I: with NBR 20 m/s
with FKM
30 m/s
Type A: with NBR 10 m/s
with FKM
15 m/s
These values apply with adequate lubrication and heat
dissipation at the seal surface. If these conditions are not
satisfied, the above limits must be reduced according to the
application.
Temperature:
-30°C to +250°C, depending
on elastomer material
see Table LI.
Figure 77 shows the maximum speed n as a function of the
average sealing lip diameter dm for the elastomer material
Acrylonitrile Butadiene Elastomer (NBR).
We offer special materials down to -40°C on request.
Media:
Mineral and synthetic oils and greases, water,
hydrocarbons, acids, lyes, etc. (depending on elastomer
material).
Speed n min - 1
10000
5000
I
A
0 50 100 150 200 250
Sealing lip diameter, d4 (mm)
Figure 77
Maximum revolutions n as a function of sealing
lip diameter d4
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Edition April 2006
179