Product Name: Backup Ring Assembly, Brass (Part No. 302244)

Description:
This component is a brass backup ring assembly, also known as a support ring or anti-extrusion ring, specifically designed for high-pressure sealing applications in waterjet cutting systems . It is a precision-machined, rigid ring manufactured from brass, a material chosen for its corrosion resistance, anti-galling properties, and ability to withstand extreme mechanical stress without permanent deformation. The backup ring is installed within a seal groove adjacent to a softer elastomeric seal, such as an O-ring. Its primary function is to provide a rigid mechanical barrier that prevents the softer seal material from extruding (flowing) into the clearance gaps between mating metal components under ultra-high pressure . The design often incorporates a split or stepped configuration for easy installation over a shaft or into a bore. This component is rated for continuous operation at 60,000–94,000 PSI (approximately 4,137–6,480 bar) and is a critical component in the high-pressure packing assembly of intensifier pumps, where it serves as a support ring for the dynamic seal.

Applications:

• Installed as a support ring for the high-pressure dynamic seal in the packing assembly of a waterjet intensifier pump plunger 

• Positioned adjacent to O-rings or U-cup seals within the high-pressure cylinder, check valve assemblies, and on/off valve components

• Provides critical anti-extrusion protection for seals operating under reciprocating motion and extreme pressure cycling

• Suitable for both dynamic (moving) and static sealing applications in waterjet cutting equipment

• Compatible with OMAX and other standard waterjet intensifier systems where it is listed as a replaceable component 

Features:

• Brass Construction: Offers excellent corrosion resistance, good thermal conductivity, and anti-seize properties, preventing galling against steel mating surfaces 

• Rigid Anti-Extrusion Support: Provides a non-deformable mechanical stop that fills the extrusion gap, allowing the O-ring to seal effectively at pressures where it would otherwise fail 

• Precision-Machined Geometry: Often features a split, stepped, or scalloped design (such as a frusto-conical concave/convex face) for easy installation and optimal pressure distribution 

• Critical Consumable Component: Designed as a wear item that should be replaced whenever the associated primary seal is changed

• OEM Compatibility: Direct replacement part listed in official maintenance parts lists alongside other rebuild components such as seal assemblies, O-rings, and static seals 

Maintenance:

Failure Diagnosis:

• Seal Extrusion: Visible extrusion or “biting” of the O-ring into the clearance gap indicates the backup ring is worn, missing, or no longer providing adequate support 

• Performance Degradation: Gradual loss of system pressure or increased pump cycling frequency can result from seal failure caused by a worn backup ring

• External Leakage: High-pressure water leaks around the plunger rod or from the pump weep hole often signal a failure in the sealing stack, requiring replacement of both the O-ring and the backup ring

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

Replacement and Inspection Procedures:

• Always Replace with Seals: The backup ring is a single-use consumable component. It should always be replaced with a new one whenever the associated primary seal (U-cup or O-ring) is replaced 

• Complete Kit Replacement: This part is typically replaced as part of a comprehensive overhaul kit that includes seal assemblies, O-rings, and static seals 

• 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 the seal stack

• Lubrication: Apply a thin coating of high-pressure grease to the backup 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 the gland nut or retaining components, tighten to the specific torque values listed in the equipment service manual to ensure proper seal compression

• Design Verification: Ensure the replacement backup ring (302244) matches the specific design characteristics (split, step, or bevel) of the original, as proper orientation is critical for its function in supporting the seal under pressure 

• Cross-Reference Compatibility: This part number is equivalent to AccuStream 302244 and is listed as a replaceable component (Back-up ring assembly, with support ring) in OMAX service guides