CP022012780-backup.117.3-1

Short Description:

Used for BFT/BHDT pump.
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Details

Product Name: Back Ring / Dynamic Backup Ring (Part No. CP022012/780)

Description:
This component is a precision back-up ring, specifically referred to as a dynamic backup ring or back ring, designed for BFT waterjet intensifier pumps . It is a rigid, precision-machined ring manufactured from high-strength materials such as PTFE, PEEK, or reinforced polymer.

Unlike a standard O-ring, which is flexible and deforms under pressure, the back-up ring is a rigid component. Its primary engineering function is to be installed adjacent to an O-ring within a seal groove to provide critical anti-extrusion support. By filling the clearance gap between the O-ring and the metal gland wall, the rigid back-up ring prevents the softer seal material from being forced into the gap under ultra-high pressure. This prevents rapid seal failure, pressure loss, and high-pressure water leaks.

This component is designed for dynamic sealing applications within the high-pressure cylinder and intensifier stack of BFT waterjet cutting systems. It is rated for continuous operation at up to 4,137 bar (approximately 60,000 PSI).

Applications:

Installed as a support component adjacent to O-rings in the high-pressure seal stack of BFT waterjet intensifier pumps.
Used in check valve assemblies, seal heads, and the main high-pressure cylinder interface.
Provides anti-extrusion protection for dynamic seals under extreme pressure cycling.
Suitable for ultra-high pressure waterjet systems operating at 60,000 PSI (4,137 bar) and above.
Compatible with BFT, BHDT, WJS, Maximator Jet, STM, and Intermac Primus waterjet intensifier systems.

Features:

Rigid Construction: Made from hard, non-deformable materials (PTFE, PEEK, composites) that withstand extrusion forces under extreme pressure.
Anti-Extrusion Function: Fills the extrusion gap, preventing the softer O-ring from being forced into the gap under high pressure.
Precision Dimensions: Machined to exact tolerances for a perfect fit in the designated seal groove.
Critical Consumable Component: Designed for periodic replacement; a worn or missing backup ring leads to immediate seal failure under high pressure.
OEM Compatibility: Direct replacement for BFT part number CP022012/780; cross-referenced with IP4010, 106013, 5300069, and HD400045.

Maintenance:

Failure Diagnosis (When to Replace):

External Water Leakage: Visible high-pressure water weeping from the pump weep hole or cylinder area indicates O-ring seal failure, at which point the backup ring must also be replaced.
Pressure Drop: Inability to maintain rated cutting pressure suggests internal seal failure, often involving extrusion damage to the O-ring caused by an unsupported gap.
Regular Overhaul Schedule: It is standard practice to replace the O-ring and its backup ring together as a set during any scheduled pump maintenance or seal replacement.
Visible Damage During Disassembly: When the pump is opened, inspect the backup ring for signs of deformation, cracking, splitting, or compression set. Any visible damage warrants immediate replacement.

Inspection and Replacement Guidelines:

Always Replace with O-Rings: This is a single-use consumable component. Always replace it with a new one whenever the adjacent O-ring is replaced.
Full Depressurization (Critical): Before any maintenance, place the main electrical disconnect in the OFF position, bleed down all high-pressure lines, and follow lockout/tagout procedures.
Clean Installation: Perform the rebuild in a designated clean area. Thoroughly clean the seal groove and all mating surfaces with a soft, lint-free cloth. Remove all debris, old seal residue, and mineral deposits.
Lubrication: Apply a thin, uniform layer of manufacturer-recommended high-pressure grease to the backup ring and O-ring during installation to prevent pinching, rolling, or tearing during assembly.
Groove Inspection: Inspect the seal groove for nicks, burrs, sharp edges, or damage that could compromise the seal stack.
Replace as a Set: When servicing the high-pressure sealing stack, it is recommended to replace all components (O-rings, backup rings, and dynamic seals) simultaneously using a complete repair kit.