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Composite seals Type MRR-A (externally sealing), Type MRR-B (internally sealing)
Rotary composite seals are particularly well suited for sealing rotating shafts, such as in rotary transmissions, rotary distributors, rotary joints and swiveling motors in mobile hydraulics and machine tools.
They consist of two components:
- a profile ring made of the high-strength fluoro-plastic, PTFE, or alternatively from an ultra-high-molecular PE for dynamic sealing of the sliding surface (primary seal)
- an O-ring for static sealing in the groove area (secondary seal)
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Groove Dimensions
*Depending on installation conditions, other profiles – differing from the standard dimensions provided – may be selected for Rotary composite seal type MRR (internally and externally sealing). The respective groove dimensions are listed in the table below.
Versions and Operating Limits
- Sliding speed max. 2.5 m/s
- Temperature range –45 °C to +200 °C
- Service pressure max. 300 bar
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Type MRR-A
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Profile
Desig-
nation* |
Groove Depth T |
Groove Width G+0,2 |
Radius R max |
Radial Clearance max E/2 |
| 8 – 40 |
2,45 |
2,2 |
0,4 |
0,15 |
| 40 – 40 |
3,75 |
3,2 |
0,6 |
0,15 |
| 80 – 80 |
5,50 |
4,2 |
1,0 |
0,20 |
| 133 – 133 |
7,75 |
6,3 |
1,3 |
0,20 |
| 330 – 330 |
10,50 |
8,1 |
1,8 |
0,25 |
| 670 – 670 |
14,00 |
9,1 |
1,8 |
0,25 |
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Type MRR-B
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Profile
Desig-
nation |
Groove Depth T |
Groove Width G+0,2 |
Radius R max |
Radial Clearance max E/2 |
| 6 – 19 |
2,45 |
2,2 |
0,4 |
0,15 |
| 19 – 38 |
3,75 |
3,2 |
0,6 |
0,15 |
| 38 – 200 |
5,50 |
4,2 |
1,0 |
0,20 |
| 200 – 256 |
7,75 |
6,3 |
1,3 |
0,20 |
| 256 – 650 |
10,50 |
8,1 |
1,8 |
0,25 |
| 650 – 1000 |
14,00 |
9,5 |
1,8 |
0,25 |
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Products 
