SKF - Industrial Shaft Seals

CRWA5 seal
Fig. 19
Pressure differentials
When subjected to a pressure differential, the
seal must resist the additional radial load generated
by the pressure. If the seal is not designed
to resist the pressure, it will be forced against
the shaft, increasing the radial load, underlip
temperature, friction and wear of the seal and
the counterface, resulting in shortened service
life.
Standard seals are rated for no more than
0,07 MPa at 5 m/s (10 psi at 1 000 ft/min), but
SKF offers CRW5 and CRWA5 pressure profile
seals that can accommodate 0,34 MPa at 5 m/s
(50 psi at 1 000 ft/min). Beyond 0,34 MPa
(50 psi), SKF offers a line of special order PTFE
seals that can accommodate more than 3,5 MPa
(500 psi).
In applications with pressure differentials,
shaft seals should be secured axially from the
low-pressure side to prevent them from moving
axially. This can be accomplished by installing
the seal into a counterbore († fig. 19) or by
using a retaining ring.
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