RS Rotary Seal

Descriptions

The profile RS rotary sealing set consists of a high-strength thermoplastic slide ring
with particularly stable thermic properties and an elastomer expander ring.
The special contact surface geometry at the inner diameter of the slide ring with the
patented (EP 0 643 243 B2) altering pitch has a major benefical effect on the lubrication of the seal. This impacts positively on both friction resistance and wear.
The expander ring responsible for the static sealing function has a rectangular crosssection. Compared to O-rings, this has advantages with regard to contact load (sealing) and deformation behavior (pumping inside the groove).
The dynamic interior sealing method is preferable. We do not recommend a dynamic
exterior sealing arrangement.
The slide ring compound used and its geometry allow use of the seal even under
maximum permissible pressure (and in case of pressure peaks) without requiring additional anti-extrusion rings. At the same time, it is possible to take maximum advantage of the diameter play between rotor and stator without any functional impairment.
In principle, the seal can also be used as a final exterior sealing device. In case of doubt, however, we recommend the use of our profiles C5 or C9.

Features

• Enhanced sealing performance in nonpressurized conditions.
• Robust seal profile for harshest operating conditions.
• Extreme wear resistance.
• Long service life thanks to applicationoptimized compounds.
• Insensitive to pressure peaks.
• Improved lubrication due to pressure
medium deposit in the dynamic contact area.
• Extremely high extrusion resistance.
• Installation in closed and undercut housings.

Range of application
Primarily for alternating sealing of rotary applications in rotating tracks, pivot drives,
hose reels, and in machine tool hydraulics.

Recommendation for rotary transmissions:
P × v ≤ 40 for L = 4.1 to 4.2
P × v ≤ 70 for L = 6.0 to 6.3
(For definition see catalogue „Hydraulic Seals“, chapter „Rotary Seals“, introduc tion.)

Compounds
The standard compound for the slide ring is a thermoplastic compound (W5071) with
outstanding physical properties.
The expander ring consists of our tried and proven standard NBR compound N3571
with 70 Shore A. For higher temperatures, we recommend HNBR compounds.
Installation
The axial fit of the seal is especially narrow and suitable for grooves conforming to
DIN ISO 7425. This benefits the total installation length of the rotary transmissions.
By selecting suitable compounds, snap installation depending on profile width down
to rotor diameter of app. 30 mm is possible. Below that, we recommend axially open
grooves for installation.