Overview & Technology:
The SHOWA GIKEN RXE 1600 Series (featuring models RXE 1640 and RXE 1625), manufactured by SHOWA GIKEN INDUSTRIAL CO., LTD. (Japan), is a specialized dual-passage (Duplex with Internal Siphon Pipe) rotary union. It is engineered to simultaneously supply heating/cooling media (steam, hot oil, cooling water) into rotating cylinder chambers while extracting condensate/return fluid through an internal siphon pipe without requiring dual independent joints.

Key Features & Highlights:
• Integrated Duplex Internal Siphon Circuit: Optimizes installation footprint at the roll journal end while ensuring efficient continuous drainage and uniform heat exchange across drying rolls.
• Advanced Mechanical Seal Technology: Employs ultra-low friction Carbon / Ceramic / Silicon Carbide sealing faces that completely eliminate pressure loss and fluid leakage under elevated temperatures.
• Self-Tightening Thread Orientations:
  - Right-Hand Thread (RH): Self-tightening during clockwise roller rotation.
  - Left-Hand Thread (LH): Self-tightening during counter-clockwise roller rotation.
• Heavy-Duty Dual Precision Bearings: Maintains concentricity, minimizes mechanical vibration, and delivers smooth, low-torque rotational stability at high operating speeds.

Durability & Heavy-Duty Construction:
Precision-machined from robust copper alloys and JIS-standard stainless steel, the RXE 1600 series withstands thermal shocks, corrosive chemical vapors, and humid environments, providing maintenance-free reliability over prolonged service cycles.

Practical Value for QA/QC:
Deploying SHOWA GIKEN RXE 1600 Series joints prevents condensate pooling inside drying drums, stabilizes surface thermal profiles across processing lines, mitigates unscheduled downtime, and maximizes industrial plant energy efficiency.

• Manufacturer: SHOWA GIKEN INDUSTRIAL CO., LTD. (SGK)
• Product Category: Duplex Rotary Joint / Rotary Union with Siphon Pipe
• Series: RXE 1600 Series
• Country of Origin: Japan
• Applicable Media: Saturated Steam, Hot/Cold Water, Thermal Oil, Compressed Air
• Maximum Operating Temperature: Up to 180°C - 200°C (depending on pressure and seal configuration)
• Maximum Operating Pressure: Up to 1.5 MPa (~15 bar)
• Maximum Rotation Speed: 800 - 1200 RPM (depending on nominal port diameter)
• Connection Standards: JIS / RC Standard Thread (or optional NPT)

DETAILED MODEL DESIGNATIONS:
• RXE 1640 RH (or RXE 1640-RH): Nominal port size 40A (1-1/2"), Duplex internal siphon configuration, Right-Hand Thread (RH).
• RXE 1625 RH: Nominal port size 25A (1"), Duplex internal siphon configuration, Right-Hand Thread (RH).
• RXE 1625 LH: Nominal port size 25A (1"), Duplex internal siphon configuration, Left-Hand Thread (LH).

DESIGNATION SYSTEM NOTES:
• 16xx: Duplex two-way passage with internal siphon return circuit.
• RH (Right Hand): Clockwise rotation tightening direction.
• LH (Left Hand): Counter-clockwise rotation tightening direction.
• 25 / 40: Nominal pipe size codes corresponding to 25A (1 inch) and 40A (1-1/2 inch).