9704521-220-quad-ring-for-BFT-waterjet.146.3-1

Short Description:

Used for BFT/BHDT pump.
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Details

Product Name: Quad-Ring / Quadruple Sealing Ring (Part No. 9704521-220)

Description:
This component is a high-performance Quad-Ring, also known as a quadruple seal or X-ring, specifically designed for the HP (High-Pressure) sealing assembly in waterjet cutting systems . It is manufactured from premium elastomeric material (rubber) and is rated for extreme operating pressures up to 4,137 bar (approximately 60,000 PSI) .

Unlike a standard O-ring which has a circular cross-section, the Quad-Ring features a four-lobed (X-shaped) profile. This unique geometry provides four sealing surfaces, significantly reducing friction and wear while enhancing sealing efficiency under high-pressure reciprocating motion. The X-shaped cross-section also allows the seal to hold a film of lubricant between the lobes, which reduces friction and heat generation.

This Quad-Ring is a critical component within the pump's seal stack, used in conjunction with other supporting rings to create a leak-tight barrier . It is a standard consumable part for high-pressure waterjet intensifier pumps and is compatible with leading systems including BFT, BHDT, WJS, and Maximator Jet .

Applications:

Installed as a dynamic seal in the high-pressure cylinder packing assembly of waterjet intensifier pumps.
Serves as the primary sealing element in the CP022100/220 HP Seal Assembly and the CP-22-0684 Seal Kit .
Suitable for ultra-high pressure waterjet systems operating at 60,000+ PSI.
Compatible with BFT, BHDT, WJS, and Maximator Jet intensifier systems .

Features:

Four-Lobed Profile: Provides four sealing surfaces for more effective sealing than standard O-rings, while reducing friction.
Reduced Friction & Wear: The X-shape allows lubrication between the lobes, minimizing heat generation and extending seal life.
High-Pressure Rating: Engineered for continuous operation at pressures up to 4,137 bar (60,000+ PSI) .
Critical Wear Component: As a dynamic elastomeric seal, it is classified as a high-wear consumable part and must be replaced periodically .
OEM Compatibility: Direct replacement for BFT #9704521/220 and cross-referenced with OEM numbers 105335, 5300005, 10064, and 1-18269 .

Maintenance:

Failure Diagnosis (When to Replace) :

External Water Leakage: The most common indicator of Quad-Ring failure is water leaking from the cylinder end cover inspection hole or weep holes . According to OEM notes, if the inspection hole on the cylinder end cover leaks, the high-pressure water seal must be replaced immediately .
Pressure Drop: Inability to maintain rated cutting pressure suggests the Quad-Ring has worn or extruded, allowing internal water bypass.
Frequent System Cycling: If the intensifier pump cycles more rapidly or frequently than normal, internal seal failure is likely.
Scheduled Preventive Maintenance: It is standard industry practice to replace the Quad-Ring during scheduled major pump overhauls (typically every 1,000-2,000 operating hours) or whenever the HP seal assembly is serviced.
Visible Damage: If the pump is disassembled, inspect the Quad-Ring for nicks, cuts, flattening (compression set), or cracking. Any visible damage warrants immediate replacement.

Replacement and Inspection Guidelines :

Replace as Part of a Kit: This Quad-Ring is typically replaced as part of a complete seal assembly or repair kit (e.g., CP022100/220 or CP-22-0684), which includes the Quad-Ring, support ring, and backup ring together . Using a complete kit ensures all components fit together correctly.
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 clean area. Thoroughly clean the seal groove and all mating surfaces with a soft cloth. Remove all debris, old seal residue, and mineral deposits.
Lubrication: Apply a thin, uniform layer of high-pressure grease to the Quad-Ring during installation to prevent dry start-up, reduce friction, and ensure proper seating.
Groove Inspection: Inspect the seal groove for nicks, burrs, or sharp edges that could damage the new seal.
OEM Note: Because BHDT equipment uses a combination of hard and soft seals in the high-pressure cylinder, it is recommended to purchase all components of the high-pressure water seal together to facilitate proper installation .