Product Short Description
Model Series: 904 Series — Multi-Passage Rotary Unions
Product Introduction:
The Deublin 904-120-188 is a multi-passage rotary union designed to transfer multiple fluid or gas media simultaneously between a stationary supply line and a rotating component. It features a modular seal cartridge design with balanced mechanical seals for high-speed rotation in industrial processing equipment.
Description
Technical Specifications:
- Part Number: 904-120-188
- Number of Passages: 4 passages
- Passage Size: 1/4″ NPT (female) per passage
- Rotary Speed: Up to 300 RPM (continuous)
- Maximum Pressure: 250 PSI (17.2 bar) per passage
- Operating Temperature: -20°C to +150°C (-4°F to +302°F)
- Housing Material: Carbon Steel (zinc-plated) or Stainless Steel 316
- Seal Material: Carbon/Silicon Carbide (C/SiC) mechanical seal
- Shaft Material: Stainless Steel 416
- Rotation Direction: Bidirectional
- Connection Type: NPT threaded
- Dimensions (approx.): 120 mm length × 90 mm diameter
Functional Features:
- Four independent fluid paths with no cross-contamination
- Balanced mechanical seal design eliminates axial thrust
- Modular seal cartridge allows field replacement without disassembly
- Compact axial design for space-constrained installations
Performance Parameters:
- Leakage Rate: < 0.1 cc/min per passage at rated pressure
- Torque: 2.5 N·m at 300 RPM
- Runout: < 0.05 mm TIR
- Media Compatibility: Water, oil, coolant, compressed air, inert gases
Structural Features:
- One-piece carbon steel or stainless steel housing
- 4 independent seal cartridges with spring-loaded face seals
- Keyed shaft for torque transmission
- Drip-proof external design
Working Principle:
The stationary housing contains four independent seal cartridges. As the shaft rotates, the seal faces slide against each other with a thin fluid film, maintaining a leak-tight barrier while allowing continuous rotation. The balanced design cancels hydraulic axial forces.
Key Advantages:
- Multi-passage capability reduces installation complexity
- Field-replaceable seals minimize downtime
- Balanced seal eliminates bearing load at high pressure
- Rated for continuous operation at 300 RPM
Applicable Industries: Plastic extrusion, rubber calendering, paper manufacturing, textile machinery, CNC spindles, winders and unwinders
Installation Requirements:
- Align shaft within 0.05 mm TIR
- Use Loctite 243 on all NPT connections
- Do not exceed 300 RPM or 250 PSI
- Install drip pan below union
Usage Notes:
- Flush all passages with compatible fluid before first use
- Monitor seal leakage; replace cartridge if leakage exceeds 0.5 cc/min
- Do not run dry; minimum 5 PSI back-pressure required
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