Product Name: Cup Spring / Belleville Spring Washer (Part No. 560285150225)

Description:
This component is a Belleville spring washer (conical spring washer), specifically designed for the high-pressure cylinder or valve assembly in BHDT waterjet intensifier pumps . It is a conical disc spring manufactured from high-grade spring steel, engineered to provide precise preload and force compensation under extreme pressure.

Unlike conventional coil springs, the Belleville spring has a conical shape, allowing it to support high loads with minimal deflection. Its primary function is to maintain consistent preload on sealing components within the pump's high-pressure seal stack . Under the extreme pressure cycling (60,000-94,000 PSI / 4,137-6,480 bar) of waterjet operation, this spring compensates for thermal expansion, seal compression set, and mechanical wear, ensuring the sealing assembly maintains proper compression and prevents leaks.

The BHDT Cup Spring is a critical structural component for maintaining the integrity of the high-pressure seal assembly. It is typically installed within the seal head or check valve assembly, working in conjunction with O-rings, backup rings, and dynamic seals to ensure reliable leak-free operation.

Applications:

• Provides consistent preload and force compensation in the high-pressure seal stack of BHDT waterjet intensifier pumps

• Installed in the check valve assembly, seal head, or high-pressure cylinder end cap

• Maintains proper compression on sealing components under extreme pressure cycling

• Used during scheduled preventive maintenance, major pump overhauls, or when external water leakage is detected

• Suitable for ultra-high pressure waterjet systems operating at 60,000-94,000 PSI

Features:

• Belleville Spring Configuration: Conical disc shape provides high load capacity with minimal deflection, ideal for space-constrained high-pressure assemblies

• Precision Load Characteristics: Engineered to deliver precise, consistent preload force across millions of pressure cycles

• High-Strength Spring Steel Construction: Manufactured from premium spring steel with heat treatment for exceptional fatigue resistance

• Thermal Compensation: Compensates for thermal expansion and contraction during pump operation, maintaining consistent seal compression

• Critical Component: While not a high-wear consumable, the cup spring can lose tension over time due to metal fatigue

• OEM Compatibility: Direct replacement for BHDT part number 560285150225

Maintenance:

Failure Diagnosis (When to Replace):

• External Water Leakage: Persistent water weeping from the seal head or check valve area may indicate the cup spring has lost preload tension

• Pressure Drop: Inability to maintain rated cutting pressure suggests the spring may no longer provide sufficient compression on sealing components

• Seal Assembly Overhaul: During major pump overhaul, inspect the cup spring for deformation, cracking, or loss of spring tension

• Visible Damage: Inspect for cracks, flattening (permanent compression set), or corrosion. Any visible damage warrants immediate replacement

• Scheduled Replacement: Although more durable than elastomeric seals, Belleville springs should be replaced during major pump overhauls (typically based on operating hours) to ensure consistent sealing performance

Inspection and Replacement Guidelines:

• Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system, lock out the main electrical disconnect, and follow lockout/tagout procedures

• Replace as Part of Complete Seal Kit: The cup spring is typically replaced as part of a complete seal head repair kit or check valve overhaul kit, not as a standalone component

• Inspect Stack Orientation: When disassembling, note the orientation of the cup spring within the seal stack (convex/concave direction). Proper orientation is critical for correct preload

• Stack Height Measurement: If multiple springs are stacked, measure the free height of the stack. If the height has reduced, the springs have taken a set and must be replaced

• Clean Installation: Perform the rebuild in a designated clean area. Thoroughly clean the spring cavity and all mating surfaces with a soft cloth

• Lubrication: Apply a thin layer of high-pressure grease to the spring during installation to prevent corrosion and ensure smooth operation

• Torque Compliance: When reinstalling the seal head or check valve components, tighten all retaining hardware to the specific torque values listed in the equipment service manual

• Use Proper Tools: Use manufacturer-specified tools to avoid damaging the spring or surrounding components during installation

Cross-Reference Information:

• BHDT #: 560285150225

• Also known as: Belleville Spring Washer, Conical Spring Washer, Cup Spring Washer

• BHDT high-pressure pump components 

• Component of seal head repair kit