10078905-Waterjet-Cutting-Pump-Parts-Coupling-38-x-38-FF.923.3-1

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Product Name: High-Pressure Coupling, .38 x .38, F/F – Part No. 10078905

Description:
This component is a high-pressure (HP) straight coupling specifically designed for 3/8 inch waterjet cutting systems. It is a female-to-female (F/F) threaded connector used to join two sections of 3/8 inch high-pressure tubing or to connect a tube to a component with a male fitting . The .38 x .38 designation indicates that both ends are sized for 3/8 inch OD (outer diameter) tubing .

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 . It is a direct OEM replacement, cross-referenced with part numbers A-0780-2 and 1-13160-60-6, and is listed in Table 12-54 (High Pressure Fitting and Valve Assemblies) .

Applications:

Joining two lengths of 3/8" 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 the main transmission line and cutting head assemblies.
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 3/8" 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 .

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 3/8" HP connections. For 3/8″ HP tubing, a common torque specification is 50 ft-lbs (68 Nm) . 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.