Industrial shaft seals

gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21,
Industrial
факс
shaft seals
(495) 22
MVR axial shaft seals
For added protection in extremely contaminated
applications, in addition to our standard
V-ring, SKF also offers the type MVR. The MVR
seal also seals axially and functions by
combining positive lip contact with centrifugal
“slinging” action. However, the MVR seal is
different in that the rubber element is stretch
fitted into a metal shell. The metal shell is then
press-fitted onto the shaft. This shell provides
excellent protection from heavy debris and it
automatically accommodates high rotating
speeds without auxiliary clamping devices.
Advantages/User benefits:
N The metal shell serves as a support and
deflector. The rubber body and lip are
protected from damage and displacement
by external debris (i.e. rocks, viscous media).
N In most cases, the shell also functions as a
holder that keeps the rubber lip in position
during high surface speeds. No additional
axial retention is required. Contact SKF
regarding radial retention limits.
N Due to its compact design, narrow
installation widths are possible.
N Frictional heat build-up and torque drag are
very low compared to contacting radial shaft
seals. As rotary speed increases, the MVR
seal lip lifts off the counter surface starting
at about 2362 FPM (12 m/s) and drops to
zero contact by 3937 FPM (20 m/s). Like
the V-ring, the high rotary speed prevents
contamination ingress while minimizing
power loss.
N Service life is considerably higher than
radial seals in contaminated environments
and can extend to thousands of hours.
Construction
The MVR seal lip is made from an 80
durometer nitrile rubber with very good wear
resistance. Other elastomers are possible in
production lot orders. There are two versions
of the metal shell, the MVR1 and the MVR2
with shell extension. Please refer to the
illustrations below for details. The stock metal
element is zinc plated cold-rolled carbon steel.
Acid resistant steel similar to SAE 316 is
available by special order.
Temperature range
Generally the same as NBR V-rings
or –40 °C to 100 °C.
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс 359 (495) 22