Product ID: 05034855 – Backup Ring (3.75 x 4.0)

Description:
This component is a backup ring, specifically designed for high-pressure hydraulic applications within waterjet intensifier pumps . It is a rigid, ring-shaped sealing support component with specific dimensions of 3.75 inches (inner diameter) by 4.0 inches (outer diameter), as indicated by the part description . This ring is installed adjacent to an O-ring (often a 3-3/4" x 4" x 1/8" O-ring, cross-referenced as part number 10075000) within a seal groove to prevent seal extrusion into clearance gaps under ultra-high pressure conditions . By providing this physical support, the backup ring protects the primary seal from damage and ensures leak-free operation during intense pressure cycling .

Applications:

• Used as a static backup ring for a 3.75 inch x 4.0 inch seal within the hydraulic or high-pressure cylinder assembly of waterjet intensifier pumps .

• Specifically listed as a component in the hydraulic seal flange section of SL-V series intensifier parts lists, supporting the main O-ring seal .

• Suitable for ultra-high pressure waterjet systems operating at 60,000 PSI, 90,000 PSI (6,200 bar), and potentially higher .

Features:

• Precise Sizing: Engineered to exact dimensions (3.75" ID x 4.0" OD) to perfectly fill the extrusion gap between the primary O-ring and the gland wall.

• High-Strength Material: Manufactured from rigid, wear-resistant materials (typically PTFE, PEEK, brass, or similar high-grade polymers) to withstand extreme pressure without deforming .

• Extrusion Protection: Functions as a rigid barrier, preventing the softer O-ring material from being forced into the clearance gap under ultra-high pressure (60,000-90,000 PSI) .

• Component Integration: Directly associated with and often replaced alongside the corresponding 3.75" x 4.0" O-ring (Part No. 10075000) in the hydraulic flange assembly .

Maintenance:

• Always Replace with Seals: During seal replacement or pump overhaul, always remove the existing backup ring and replace it with a new one. Do not reuse a backup ring that shows signs of permanent compression set, splitting, deformation, or edge damage.

• Inspection: Before installation, inspect the backup ring for signs of cracking, wear, extrusion damage, or loss of dimensional integrity.

• Proper Installation: Install the backup ring in the correct orientation, typically placed on the low-pressure side of the O-ring unless specified otherwise in the equipment service manual.

• Groove Inspection: Before installing the new backup ring and O-ring, ensure the corresponding internal groove in the cylinder bore or flange housing is clean, smooth, and free from burrs or damage that could compromise the seal.

• Full Depressurization: Always fully depressurize both the hydraulic system and the high-pressure water system before disassembling any component. Follow lockout/tagout procedures.

• Cross-Reference Information: This part number is known to have cross-references including KMT#05034855, AccuStream, 1-11680-240, and is listed among BFT parts .