Deublin 904-120-188

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.

Category:
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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