Product Name: Backup Ring, Chamfered (Part No. 301961)

Description:
This component is a chamfered backup ring, a rigid, ring-shaped sealing support component specifically designed for high-pressure dynamic sealing applications in waterjet intensifier pumps and hydraulic cylinders . It is manufactured from wear-resistant material (typically PTFE, PEEK, POM, or brass) and features a precision-machined chamfer (beveled edge) on one side.

The backup ring is installed in a seal groove adjacent to an O-ring or other elastomeric primary seal . Its primary engineering function is to fill the extrusion gap between the primary seal and the gland wall, providing rigid support that prevents the softer seal material from being forced into the clearance gap under ultra-high pressure (typically 60,000–90,000 PSI / 4,137–6,200 bar). The chamfered design allows the backup ring to seat properly against the O-ring and the gland, ensuring uniform pressure distribution and optimal sealing performance under extreme pressure cycling. This component is a critical part of the pump seal assembly and is often included in pump seal repair kits.

Applications:

• Installed adjacent to O-rings within the high-pressure cylinder seal stack of waterjet intensifier pumps

• Provides anti-extrusion protection for dynamic seals on reciprocating plungers and pistons

• Suitable for both dynamic (moving) and static sealing applications in ultra-high pressure waterjet systems

• Compatible with standard waterjet intensifier pump assemblies and hydraulic components

Features:

• Chamfered Design: Precision-machined beveled edge ensures proper seating against the O-ring and gland wall for uniform pressure distribution

• Wear-Resistant Material: Constructed from PTFE, PEEK, brass, or POM to withstand extreme pressure without deformation

• Anti-Extrusion Function: Provides a rigid mechanical barrier that prevents O-ring material from flowing into clearance gaps under pressure

• High-Pressure Rating: Engineered for continuous operation at 60,000–90,000 PSI (4,137–6,200 bar)

• Critical Consumable Component: Designed for periodic replacement whenever the associated primary seal is replaced

• OEM Compatibility: Listed as a replaceable component in parts diagrams for P2040V series pumps 

Maintenance:

Failure Diagnosis:

• Seal Extrusion: Visible extrusion or "biting" of the O-ring into the clearance gap indicates the backup ring is worn or missing

• Pressure Drop: Gradual loss of system pressure may result from seal failure caused by a worn or deformed backup ring

• External Leakage: High-pressure water leaks around the plunger rod or from the pump weep hole often signal failure in the sealing stack

• Visible Damage During Disassembly: Replace immediately if the backup ring shows signs of cracking, splitting, flattening, galling, or permanent compression set

Replacement and Inspection Procedures:

• Always Replace with Seals: The backup ring is a single-use consumable component. Always replace it with a new one whenever the associated O-ring or primary seal is replaced 

• Complete Kit Replacement: This component is typically replaced as part of a comprehensive pump seal repair kit

• Orientation Check (Critical): The chamfered side of the backup ring must be installed with the correct orientation—typically facing the O-ring or positioned on the low-pressure side of the seal stack as specified in the equipment service manual

• Groove Inspection: Before installing a new backup ring, thoroughly clean the seal groove and mating surfaces. Inspect the groove for burrs, nicks, or damage that could compromise sealing

• Lubrication: Apply a thin coating of high-pressure grease to the backup ring and O-ring during installation to prevent dry start-up and ensure proper seating

• Full Depressurization: Before any maintenance, fully depressurize the waterjet system (high-pressure water, hydraulic system, and air supply) and follow lockout/tagout procedures

• Torque Compliance: When reinstalling gland nuts or retaining components, tighten to the specific torque values listed in the equipment service manual to ensure proper seal compression

• Storage: Store spare backup rings in a clean, dry environment away from direct sunlight, ozone, and chemicals to prevent material degradation