Back up O-ring for NLB 20201

The AA-1790 back up O-ring serves as an auxiliary sealing component within high-pressure hydraulic systems. Its primary function is to provide mechanical support to the main O-ring or dynamic seal, preventing extrusion and deformation of the primary seal under elevated pressure conditions. By maintaining the position of the main seal within its housing, this component helps ensure the integrity of the hydraulic circuit.

This part is specifically engineered for use with NLB equipment, including the 20201 and DBA-660 models. These machines are utilized in ultra-high-pressure water jetting applications for industrial cleaning and surface preparation. The back up O-ring is installed within pumps, valves, and cylinders where fluid pressures are significant. Proper fitment is required to ensure the component provides the necessary support to the primary sealing element.

Back up rings are typically installed on the low-pressure side of the primary seal. In hydraulic systems, they act as a rigid barrier that resists the pressure forces that would otherwise push the softer primary O-ring into the clearance gap between mating surfaces. Regular inspection and replacement of these rings during maintenance cycles are necessary to prevent premature failure of the primary seal and subsequent fluid leakage.