Product Name: Check Valve Static Backup Ring (Part No. 300735)

Description:
This component is a static backup ring specifically designed for the check valve assembly in high-pressure waterjet cutting systems . It is a precision-machined rigid ring manufactured from copper beryllium alloy, a material selected for its excellent mechanical strength, corrosion resistance, and anti-galling properties . The ring features an outer diameter of 0.8125 inches and an inner diameter of 0.563 inches .

The static backup ring functions as an anti-extrusion support component installed adjacent to a static O-ring or seal within the check valve assembly . Under ultra-high pressure (typically 60,000–94,000 PSI), the softer O-ring material would otherwise be forced into the clearance gaps between mating metal components. This rigid backup ring fills that extrusion gap, providing a mechanical barrier that prevents seal deformation and ensures reliable leak-free operation . It is listed in official maintenance guides as a component to be inspected during check valve overhaul .

Applications:

• Provides static seal support within the check valve assembly of waterjet intensifier pumps

• Installed adjacent to static O-rings to prevent seal extrusion under ultra-high pressure

• Suitable for ultra-high pressure waterjet systems operating at 60,000 PSI and above

• Compatible with OMAX / AccuStream waterjet intensifier check valve assemblies 

Features:

• Copper Beryllium Construction: Provides high strength, excellent corrosion resistance, and anti-galling properties essential for high-pressure applications 

• Precision Dimensions: Outer diameter: 0.8125 inches; Inner diameter: 0.563 inches 

• Static Seal Support: Specifically designed for static (non-moving) sealing applications within the check valve assembly 

• Anti-Extrusion Function: Prevents the softer O-ring material from flowing into clearance gaps under extreme pressure 

• Inspection Component: Listed as a component to be inspected (rather than automatically replaced) during check valve service 

• OEM Compatibility: Interchangeable with OMAX 300735, AccuStream, and other standard check valve assemblies 

• Production Cross-Reference: Equivalent to AccuStream part number 1-13179 

Maintenance:

Inspection Criteria:

• Inspect During Service: This component is listed as a component to be inspected (not automatically replaced) during check valve overhaul . Remove and examine the backup ring for signs of wear, deformation, cracking, or compression set.

• Check for Deformation: Inspect the ring for flattening, splitting, or permanent compression that could reduce its ability to support the O-ring.

• Surface Condition: Look for galling, scratching, or surface damage that could compromise the seal stack integrity.

• Dimensional Integrity: Verify the ring maintains its original shape and thickness.

Replacement Guidelines:

• Replace if Damaged: Unlike some consumable seals that are always replaced, this backup ring is an "inspect" component . Replace it immediately if visible wear, deformation, cracking, or compression set is detected.

• Replace with O-Rings: Although listed as an inspect component, it is good practice to replace the backup ring when replacing the adjacent static O-ring to ensure optimal seal stack performance.

• Clean Thoroughly: Before reinstallation, clean the backup ring and the mating groove with a soft cloth and low-pressure water. Remove all debris, old seal residue, and mineral deposits.

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

• Full Depressurization: Always fully depressurize the waterjet system (high-pressure water, hydraulic system, and air supply) and follow lockout/tagout procedures before disassembling the check valve assembly.

• Proper Assembly: Ensure the backup ring is correctly seated in the groove adjacent to the O-ring before tightening the check valve retainer.

Additional Information:

• Brand Context: This part is manufactured for the AccuStream / OMAX product lines. Note that AccuStream is a brand of Hypertherm Associates, the same parent company that manufactures OMAX waterjet systems .

• Alternative Part Numbers: This component is also known under product code WO040016  and AccuStream number 1-13179 .