The BU Ultrathan® rod seal is a compact seal with an integrated anti-extrusion ring. It is frequently used as a buffer seal within sealing systems such as those utilized in construction machine cylinders. Construction machine cylinders operate in harsh conditions in which pressure peaks of up to 1000 bar frequently occur. The BU rod seal is installed upstream to isolate such loads from the secondary seal. Due to its special shape, the seal (like a return valve) is able to return pressure that may build up between the primary and the secondary seal into the system. A single or tandem arrangement of this product series is possible as well.

• Enhanced sealing performance in non-pressurized 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.
• Dimensions according to ISO 5597.
• Dimensions according to ISO ¬7425-2.
• Short axial assembly length.
• Installation in closed and undercut housings.
• Further dimensions of machined series with short lead times available.

Range of application:
Mainly used for sealing cylinders in mobile hydraulics.

The BU rod seal is available in the following compounds:
00575 - Bio-degradable fluids
00655 - Low temperatures
00656 - Industrial applications
00664 - Heavy-duty