Polyurethane U-cup buffer seals
RBB profiles (fig. 1
) have a LUBRITHANE (TPU) sealing ring that incorporates a polyamide (PA) or polyacetal (POM) anti-extrusion ring. The flexible outside static sealing lip and notches in the front face ensure that pressure can return to the system side of the buffer and prevent build-up of pressure between the rod and buffer seals. These profiles are suitable for extreme pressure peaks and demanding workloads in heavy duty applications up to 690 bar (10 000 psi)
. They are available in metric (Size list [pdf]
) and inch sizes (Size list [pdf]
), some metric sizes fit seal housings in accordance with ISO 7425-2:1989.