10079028-HP-Coupling--25-x-25-FF-High-Pressure-Fitting-and-Valve-Assemblies.921.3-1

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Product Name: HP Coupling, .25 x .25, F/F – Part No. 10079028

Description:
This component is a high-pressure (HP) straight coupling, specifically designed for 1/4 inch waterjet cutting systems . The .25 x .25 designation indicates that both ends are sized for 1/4 inch OD (outer diameter) high-pressure tubing, while F/F denotes that both ends feature female (F) threads . According to manufacturer documentation, this coupling is listed in Table 12-54 (High Pressure Fitting and Valve Assemblies) .

The coupling is precision-machined from high-strength stainless steel to withstand the extreme pressure cycling and vibration inherent in waterjet operation . It is rated for continuous operation at 60,000 PSI (approximately 4,137 bar) . The coupling utilizes the industry-standard cone-and-thread (cone & thread) metal-to-metal sealing design, ensuring a leak-tight connection with standard 1/4" HP fittings, gland nuts, and coned inserts . It is a direct OEM replacement, cross-referenced with part numbers A-0779-1, 1-13160-60-1, KMT 10079028, and H2O Jet 400011-1 .

Applications:

Joining two lengths of 1/4" high-pressure stainless steel tubing in the waterjet plumbing system
Connecting high-pressure lines to intensifier pumps, manifolds, on/off valves, or check valves
Serving as a high-pressure union in both flexible motion axes and main transmission lines
Compatible with KMT, AccuStream, Flow, OMAX, H2O Jet, BFT, WSI, and other standard waterjet systems

Features:

High-Pressure Rating: Engineered for continuous operation at 60,000–94,000 PSI (4,137–6,200 bar)
Stainless Steel Construction: High-strength, corrosion-resistant material for durability in harsh environments
Female-Female (F/F) Configuration: Provides a direct union for two male 1/4" HP fittings
Precision Sealing Surfaces: Features precision-machined 60-degree cone seats for a reliable metal-to-metal seal with coned inserts
Direct OEM Replacement: Interchangeable with major brand part numbers listed in Table 12-54
1/4 Inch Connection Size: Standard size for flexible high-pressure waterjet plumbing on motion axes

Maintenance:

Failure Diagnosis:

External Water Leakage: Visible weeping at the connection indicates a failed cone seal, damaged threads, or improper torque. All high-pressure leaks must be repaired immediately
Thread Damage: Stripped, galled, or corroded threads prevent proper tightening
Cone Seat Damage: Nicks, galling, or pitting on the 60-degree sealing surface will compromise the seal
Cracked or Deformed Body: Any visible cracking or distortion requires immediate replacement

Inspection and Replacement Guidelines:

Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system, shut off the water supply, bleed all pressure, and follow lockout/tagout procedures. Never service a pressurized HP line
Two-Wrench Method (Critical): When tightening or loosening, always use two appropriately sized wrenches—one to counter-hold the coupling body and one to turn the gland nut. This prevents twisting stress on the assembly and ensures the cone seat remains properly aligned
Lubrication: Apply a thin, even layer of high-pressure anti-seize lubricant (e.g., "Silver Grade" or "Blue Goop") to the male threads of the gland nuts only. Do not apply lubricant to the cone sealing surfaces, as this can prevent the metal-to-metal seal
Torque Compliance: Tighten both gland nuts to the specific torque value listed in the equipment service manual for 1/4" HP connections. Use a calibrated torque wrench
Replace Worn Components: When disassembling a high-pressure joint, it is standard practice to replace the cone, gland, and collar if they show signs of wear. Use new components for the reassembly to ensure a leak-free seal
Replacement Criteria: Replace the coupling immediately if threads are damaged, cone seats are pitted or deformed, cracks are visible, or persistent leakage occurs despite correct installation. Do not attempt to repair a cracked or severely eroded coupling body