Hybrid rod seals
Hybrid rod seals incorporate dynamic sealing lips of different materials. These material combinations provide a hybrid with the functional benefit of each material and, therefore, a robust rod seal. An example is the sealing ability and resilience of nitrile rubber (NBR) combined with the extrusion and wear resistance of polyurethane (TPU).
DZ profiles (fig. 1) combine an NBR primary sealing ring with a LUBRITHANE (TPU) secondary sealing ring into one seal. This combination provides a good low temperature resilience and is suitable for pressures up to 400 bar (5 800 psi) in medium to heavy duty applications. DZ profiles are available in metric (→ Size list [pdf]) and inch sizes (→ Size list [pdf]). They are also available with an elastomer (FLUOROTREL/TPC) secondary sealing ring on request. For additional information, refer to DZ profile data.
These SKF hybrid rod seals have been proven successful in low temperature applications. The NBR primary lips also provide improved long term sealing performance and a greater capability to track larger radial deflections between the rod and the head.
DZR profiles (fig. 2
) combine an NBR primary sealing ring, a LUBRITHANE (TPU) secondary sealing ring and a triangular polyamide (PA) anti-extrusion ring (→ Anti-extrusion rings
) into one seal. These combinations provide good low temperature resilience, and improved resistance to deformation, wear, and gap extrusion. They are suitable for extreme pressures up to 690 bar (10 000 psi)
in heavy duty applications. DZR profiles are available in metric (→ Size list [pdf]) and inch sizes (→ Size list [pdf]). For additional information, refer to DZR profile data