BU
rod seal/buffer seal
Descriptions
The profile BU rod seal is a compact seal with an integrated anti-extrusion ring. A typical application of this seal profile is its use as a buffer seal in sealing systems often found on construction machinery cylinders. These cylinders operate under extreme conditions where pressures up to 1000 bar are not unusual.
The Ultrathan rod seal profile BU is used to protect the secondary seal from this load.
Due to its special form the seal is in a position to transfer pressure, which develops between the primary and secondary seal, back into the system. Single as well as tandem configurations of this seal profile are possible.
Features
Enhanced sealing performance in nonpressurized conditions.
Robust seal profile for harshest operating conditions.
Extreme wear resistance.
Insensitive to extreme pressure peaks.
Extremely high extrusion resistance.
Excellent media resistance in case of suitable compound selection.
Suitable compounds available for special requirements of the chemical process industry.
Suitable compounds available for special requirements of the food processing industry.
Short axial assembly length.
Installation in closed and undercut housings.
Additional sizes of machined products available on short notice.
Range of application
Primarily for sealing cylinders in mobile hydraulics.
| Operating pressure | ≤ 500 bar |
| Pressure peaks | ≤ 1000 bar |
| Operating temperature | -35 °C to +110 °C |
| Sliding speed | ≤ 0.5 m/s |
| Media | Hydraulic oils based on mineral oil |
| d | D | H | L | d1 |
| 55 | 70 | 8.5 | 9.5 | 55.5 |
| 56 | 71 | 8.5 | 9.5 | 56.5 |
| 60 | 75 | 8.5 | 9.5 | 60.5 |
| 60 | 75.1 | 6.1 | 6.3 | 60.5 |
| 63 | 78.1 | 6.1 | 6.3 | 63.4 |
| 65 | 80 | 8.5 | 9.5 | 65.4 |
| 65 | 80.5 | 6.1 | 6.3 | 65.4 |
| 70 | 85 | 8.5 | 9.5 | 70.5 |
| 70 | 85.1 | 6.1 | 6.3 | 70.5 |
| 75 | 90 | 8.5 | 9.5 | 75.5 |
| 80 | 95 | 8.5 | 9.5 | 80.5 |
| 80 | 95.1 | 6.1 | 6.3 | 80.5 |
| 80 | 95.5 | 6.1 | 6.3 | 80.4 |
| 85 | 100.5 | 6.1 | 6.3 | 85.4 |
| 90 | 105 | 8.5 | 9.5 | 90.5 |
| 90 | 105.5 | 6.1 | 6.3 | 90.4 |
| 95 | 110.5 | 6.1 | 6.3 | 95.4 |
| 100 | 115.5 | 6.1 | 6.3 | 100.4 |
| 100 | 120 | 11.4 | 12.5 | 100.6 |
| 110 | 125.5 | 6.1 | 6.3 | 110.4 |
| 110 | 130 | 11.4 | 12.5 | 110.6 |
| 120 | 140 | 11.4 | 12.5 | 120.6 |
| 130 | 150 | 14.5 | 16 | 130.6 |
| 140 | 160 | 14.5 | 16 | 140.6 |
| 150 | 170 | 14.5 | 16 | 150.6 |
| 160 | 180 | 14.5 | 16 | 160.6 |
| 170 | 190 | 10.3 | 11 | 170.6 |
| 180 | 205 | 14.5 | 16 | 180.8 |
| 200 | 225 | 14.5 | 16 | 200.8 |
| 220 | 250 | 18.2 | 20 | 220.8 |
| 250 | 280 | 18.2 | 20 | 250.8 |
| 280 | 310 | 18.2 | 20 | 280.8 |