315163080255-cup-ring-BHDT-spare-parts.1807.3-1

Short Description:

Used for BFT/BHDT pump.
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Details

Product Name: Cup Ring / U-Cup Dynamic Seal (Part No. 315163080255)

Description:
This component is a high-performance cup ring (often referred to as a U‑cup or rod seal), specifically designed for the high‑pressure cylinder assembly in BHDT waterjet intensifier pumps . It is a precision dynamic seal manufactured from high‑grade, wear‑resistant elastomer or polyurethane, engineered to provide a leak‑tight barrier for a reciprocating plunger or piston rod under extreme pressure.

Unlike a static O‑ring, the cup ring features a distinctive U‑shaped cross‑section. This profile is “pressure‑energized”: as system pressure increases, the lips of the “U” are forced outward against the metal sealing surfaces, creating a tighter seal while maintaining low friction during the stroke. This design ensures reliable sealing performance under ultra‑high pressure cycling (typically 60,000‑94,000 PSI / 4,137‑6,480 bar) while minimising wear and heat generation.

Applications:

Provides the primary dynamic seal for the reciprocating plunger or piston rod in BHDT high‑pressure cylinder units .
Installed within the packing or seal stack of the intensifier pump’s high‑pressure cylinder.
Used during scheduled preventive maintenance, pump overhauls, or when external water leakage is detected from the cylinder area.
Compatible with BHDT high‑pressure pumps and seal assemblies.

Features:

Pressure‑Energized U‑Cup Design: The U‑shaped lip expands under pressure, providing a tighter seal as system pressure increases while maintaining low friction.
Wear‑Resistant Material: Manufactured from high‑grade polyurethane or elastomer to withstand millions of high‑cycle strokes without premature failure.
Low Friction Operation: The optimised lip geometry reduces friction between the seal and the reciprocating rod, minimising wear on both components.
Critical Consumable Component: As a dynamic high‑wear part, it is designed for periodic replacement during normal pump maintenance.
OEM Compatibility: Direct replacement for BHDT part number 315163080255 .

Maintenance:

Failure Diagnosis (When to Replace):

External Water Leakage: Visible water weeping from the high‑pressure cylinder area or pump weep holes indicates cup ring failure and requires immediate replacement.
Pressure Drop: Inability to maintain rated cutting pressure suggests the seal is worn and allowing internal water bypass.
Hydraulic Oil Contamination (Water Intrusion): Milky or discoloured hydraulic oil indicates high‑pressure water has breached the dynamic seal.
Increased Pump Cycling Frequency: If the intensifier cycles more rapidly or frequently than normal, internal seal bypass is likely.
Scheduled Preventive Maintenance: Replace the cup ring during scheduled major pump overhauls (typically based on operating hours) or whenever the high‑pressure seal stack is serviced.
Visible Damage During Disassembly: Inspect the sealing lip for nicks, cuts, flattening (compression set), or cracking. Any visible damage warrants immediate replacement.

Inspection and Replacement Guidelines:

Full Depressurisation (Critical): Before any maintenance, fully depressurise the waterjet system, lock out the main electrical disconnect, and follow lockout/tagout procedures.
Use Complete Seal Kits: This cup ring is typically replaced as part of a complete seal assembly or repair kit. BHDT equipment uses a combination of hard and soft seals; it is recommended to purchase all high‑pressure seal components together to facilitate proper installation .
Clean Installation: Perform the rebuild in a designated clean area. Thoroughly clean the seal groove, cylinder bore, and all mating surfaces with a soft cloth.
Lubrication: Apply a generous, uniform layer of manufacturer‑recommended high‑pressure grease to the cup ring and cylinder bore during installation to prevent dry start‑up and ensure proper seating.
Orientation (Critical): The cup ring must be installed with the open “U” side facing the high‑pressure water source. Incorrect orientation will result in immediate leakage.
Rod/Cylinder Bore Inspection: Before installing a new cup ring, thoroughly inspect the reciprocating rod and cylinder bore surfaces for scoring, pitting, or damage. A damaged metal component will rapidly destroy a new seal.
Use Proper Tools: Use manufacturer‑specified seal installation tools or sleeves to guide the cup ring over threads and into the bore without rolling or pinching the sealing lip.
Torque Compliance: When reassembling the cylinder components, tighten all retaining hardware to the specific torque values listed in the equipment service manual.