The B07 profile represents a high-performance, single-acting non-metallic backup ring featuring an asymmetrical cross-section with a stepped, dual-level top surface. Engineered explicitly to protect elastomeric sealing elements, such as O-rings or lip seals, from gap extrusion and nibbling under high operating pressures, it acts as a rigid support wall on the low-pressure side of the groove. While providing no independent fluid sealing function, its unique stepped geometry provides a specialized nested containment pocket that physically optimizes the seating orientation of the primary seal.

The solid stepped body is precision-machined or molded from high-modulus, premium engineering plastics, most commonly Virgin Polytetrafluoroethylene (PTFE), carbon-filled or bronze-filled PTFE compounds, Polyoxymethylene (POM), or high-strength Thermoplastic Polyurethane (TPU). These advanced compounds offer exceptional shear resistance, high compressive strength, and minimal cold flow tendencies under intense mechanical load. It functions reliably within a wide temperature spectrum from -50°C to +135°C (up to +200°C when utilizing high-spec fluoropolymer variants) and demonstrates complete chemical compatibility with standard mineral hydraulic oils, synthetic lubricants, water-glycol fluids, and aggressive chemical media.

The unique dual-level stepped profile delivers significant structural benefits over traditional flat or concave configurations:

• Anti-Tilt Retention: The lower, extended horizontal step acts as an anchoring shoulder that locks into matching hardware or nests under the primary seal, preventing the backup ring from twisting, rolling, or shifting within the installation groove during heavy pressure reversals.
• Optimized Pressure Distribution: By presenting a rigid, vertical backing wall immediately adjacent to the clearance gap, it bridges the extrusion path flawlessly.
• Extended Seal Longevity: This robust cross-sectional design comfortably elevates the pressure-handling capabilities of standard elastomeric seals up to 50 MPa or higher, eliminating micro-shaving failures and maintaining consistent radial contact pressure under severe cyclical loading.

The B07 stepped backup ring is widely specified across heavy-duty industrial, mobile hydraulic, and high-pressure fluid handling infrastructure where high system pressure, aggressive cycling, or extreme clearance gaps pose an extrusion risk to standard seals. It is standardly equipped in high-pressure SAE hydraulic flanges, cartridge valve housings, multi-stage control manifolds, and heavy-duty hydraulic cylinder piston or rod glands. Additionally, its superior anti-extrusion efficiency and low-friction wear properties make it the ideal selection for chemical processing metering pumps, high-pressure industrial pipe fittings, injection molding machines, and subsea oil and gas control valves.