DR014001220-Sealing-Ring-NS14-BHDT-spare-parts.1912.3-1

Short Description:

Used for BFT/BHDT pump.
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Details

Product Name: Sealing Ring / Backup Ring (NS14) – Part No. DR014001220

Description:
This component is a precision sealing ring, specifically designated as NS14, serving as a backup ring (back‑up ring) for BHDT high‑pressure waterjet intensifier pumps. It is a rigid, anti‑extrusion component manufactured from high‑strength, wear‑resistant material such as PTFE, PEEK, or engineered polymer.

In BHDT ultra‑high pressure systems (operating up to 60,000‑94,000 PSI / 4,137‑6,480 bar), the sealing technology often combines hard seals and soft seals within the high‑pressure cylinder assembly. This sealing ring functions as a back‑up ring for the soft seal components. It is installed adjacent to an elastomeric O‑ring within a seal groove. Under extreme pressure, the rigid backup ring fills the clearance gap, preventing the softer O‑ring material from extruding into the gap. This anti‑extrusion function is critical for preventing rapid seal failure, high‑pressure water leaks, and maintaining system pressure integrity.

Applications:

Provides anti‑extrusion support for O‑rings in the high‑pressure cylinder end cover and seal head assemblies of BHDT waterjet intensifier pumps.
Used in static sealing applications where high reliability is required under extreme pressure cycling.
Suitable for ultra‑high pressure waterjet systems operating at 60,000‑94,000 PSI (4,137‑6,480 bar).
Compatible with BHDT high‑pressure intensifier components and systems.

Features:

Rigid Anti‑Extrusion Design: The hard, non‑deformable construction provides a mechanical barrier that prevents the softer primary seal from being forced into clearance gaps.
Precision Dimensions: Manufactured to exact tolerances (NS14 size) for a secure, perfect fit in the designated seal groove.
Critical Consumable Component: Designed for periodic replacement; a worn, deformed, or missing backup ring will lead to immediate seal failure and high‑pressure water leakage.
OEM Compatibility: Direct replacement for BHDT part number DR014001220.
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 assembly must be replaced immediately. This is a primary indicator of backup ring or O‑ring failure.
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.
Visible Damage During Disassembly: When the pump is opened, inspect the backup ring for signs of deformation, cracking, splitting, flattening (compression set), or wear. 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 or major overhaul.

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.
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 .
Purchase Together (Recommended): Because BHDT equipment uses a combination of hard and soft seals in the high‑pressure cylinder, it is strongly recommended to purchase all high‑pressure seal components together to facilitate proper installation and ensure component compatibility.