DR012001220-Sealing-Ring-NS12-BHDT-spare-parts.1911.3-1

Short Description:

Used for BFT/BHDT pump.
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Details

Product Name: Sealing Ring / Backup Ring (Part No. DR012001220)

Description:
This component is a Sealing Ring, specifically sized as NS12 and used as a Backup Ring (Back-up Ring) in BHDT high-pressure waterjet intensifier pumps . It is a precision rigid ring manufactured from high-strength, wear-resistant material (such as PTFE, PEEK, or engineered polymer).

In high-pressure sealing systems (typically up to 60,000-94,000 PSI / 4,137-6,480 bar), BHDT equipment employs a combination of hard seals and soft seals. The high-pressure cylinder and plug utilize hard seals, while the high-pressure cylinder and cylinder end cover utilize soft seals . This sealing ring functions as a "Back-up Ring" for the soft seal component. It is installed adjacent to an elastomeric O-ring to provide critical anti-extrusion support, filling the radial gap and preventing the softer O-ring material from being forced into the clearance under extreme pressure, which would otherwise cause rapid seal failure and water leaks.

This component is part of the BHDT high-pressure sealing system and is designed to be used in the assembly between the high-pressure cylinder and the cylinder end cover.

Applications:

Provides anti-extrusion support for O-rings in the high-pressure cylinder end cover seal assembly of BHDT waterjet intensifier pumps .
Used as a static sealing support component in the combination of hard and soft seals on BHDT equipment.
Suitable for ultra-high pressure waterjet systems operating at 60,000-94,000 PSI.
Compatible with BHDT high-pressure intensifier components.

Features:

Rigid Anti-Extrusion Design: The rigid construction fills the extrusion gap, preventing the softer primary seal from failing under pressure.
Precision Dimensions: Manufactured to exact tolerances (NS12 size) 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 and water leakage.
OEM Compatibility: Direct replacement for BHDT part number DR012001220.
Static Sealing Application: Specifically engineered for non-moving (static) interfaces.

Maintenance:

Failure Diagnosis (When to Replace):

External Water Leakage: According to BHDT equipment notes, if the inspection hole on the cylinder end cover leaks, the high-pressure water seal must be replaced immediately . This is the primary indicator of seal failure.
Pressure Drop: Inability to maintain rated cutting pressure suggests internal seal failure, often involving extrusion damage.
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.
Regular Overhaul Schedule: It is standard practice to replace the backup ring together with the O-ring as a set during any scheduled pump maintenance.

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. Do not reuse old backup rings.
Purchase Together (Recommended): The end sealing technology requirements are high. It is strongly recommended that you purchase the high-pressure water seal components (including this backup ring, the O-ring, and related seals) together to facilitate proper installation and ensure component compatibility .
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.