Product ID: 10187250 – Backup Ring

Description:
This component is a backup ring designed for high-pressure waterjet cutting systems. It is a rigid, ring-shaped sealing support component installed adjacent to an O-ring or other elastomeric seal to prevent seal extrusion into clearance gaps under ultra-high pressure.

Applications:

• Used in waterjet cutting machines alongside O-rings or rod seals in high-pressure cylinders, intensifier pumps, check valves, and dump valves.

• Installed in seal grooves on plungers, pistons, sealing heads, or gland assemblies to support dynamic or static seals.

• Suitable for both pure water and abrasive waterjet systems requiring reliable seal retention under extreme pressure.

Features:

• Manufactured from rigid, wear-resistant materials such as PTFE, PEEK, nylon, or acetal to withstand high pressure without deforming.

• Precision-machined or molded to exact dimensions for proper fit within seal grooves and against mating surfaces.

• Typically split or scalloped design for easy installation over shafts or into bores without damaging the ring or adjacent seals.

• Functions by filling the extrusion gap between the O-ring and the gland wall, preventing the softer seal material from flowing into the gap.

• Engineered to withstand ultra-high pressure, typically 60,000 psi (approximately 4,137 bar) or higher.

• Chemically compatible with water, hydraulic fluids, and mild abrasive slurries.

• Available in various cross-sectional shapes including rectangular, beveled, or stepped configurations.

Maintenance:

• During seal replacement, always remove the existing backup ring and inspect it for deformation, cracking, wear, or extrusion damage.

• Do not reuse a backup ring that shows signs of permanent compression set, splitting, or edge damage.

• Clean the backup ring with a soft cloth and compatible solvent if being inspected; do not use abrasive tools.

• When installing new seals, place the backup ring on the low-pressure side of the O-ring or seal unless specified otherwise in the service manual.

• For dynamic applications, ensure the backup ring orientation matches the direction of pressure to provide proper support.

• Ensure the backup ring inner diameter fits freely over the shaft or outer diameter fits correctly into the bore without binding.

• Install split or scalloped backup rings by hand, carefully overlapping or expanding as designed; avoid overstretching.

• Never install a backup ring without its corresponding O-ring or primary seal, as the backup ring alone does not provide sealing.

• Replace the backup ring every time the associated O-ring or seal is replaced to ensure proper extrusion protection.

• Store spare backup rings in a clean, dry environment away from direct sunlight, ozone, or harsh chemicals.