Overview & Technology:
The SHOWA GIKEN RXK 6081 90A-50A Rotary Joint (Rotary Union), engineered by SHOWA GIKEN INDUSTRIAL CO., LTD. (Japan), is a heavy-duty high-temperature fluid transfer unit designed specifically for industrial drying rolls and calender cylinders. Utilizing advanced self-aligning spherical carbon/ceramic mechanical seal technology, the RXK series ensures leak-free media supply and recirculation under severe thermal stresses and rotational deflections.

Key Features & Highlights:
• Coaxial Dual-Flow Duplex Circuit (90A Outer / 50A Inner): Enables simultaneous supply of heating media and continuous drainage of condensate or return thermal oil through the internal siphon pipe, maximizing roll heat exchange efficiency.
• Self-Aligning Spherical Seal Design: Spherical graphite seal faces automatically adjust to roll thermal expansion, journal deflection, and angular misalignments, preventing premature seal chipping and wear.
• Severe Temperature & Pressure Capability: Built to perform continuously in thermal oil systems up to 200°C - 230°C and high-pressure saturated steam lines without mechanical breakdown.
• Low-Friction Rotational Torque: Minimizes mechanical resistance, relieves stress on drive motors, and provides vibration-free operation.

Durability & Heavy-Duty Construction:
The casing is cast from high-strength ductile iron or JIS-standard alloy cast steel. Critical wear components feature hardened surfaces with superior corrosion and thermal shock resistance, ensuring multi-year round-the-clock reliability.

Practical Value for QA/QC:
Deploying the SHOWA GIKEN RXK 6081 90A-50A rotary joint eliminates condensate pooling inside drying drums, stabilizes surface thermal profiles across paper/carton/rubber lines, prevents emergency line stops caused by seal blowouts, and lowers maintenance overhead.

• Manufacturer: SHOWA GIKEN INDUSTRIAL CO., LTD. (SGK)
• Product Category: Heavy-Duty High-Temperature Rotary Joint / Rotary Union
• Model: RXK 6081 90A-50A
• Series: RXK Series
• Country of Origin: Japan
• Flow Circuit: Coaxial Dual Passage with Internal Siphon Pipe (Duplex Flow)
• Nominal Port Dimensions:
  - Outer Casing Port Size: 90A (~3-1/2")
  - Internal Siphon Pipe Size: 50A (~2")
• Applicable Media: Saturated Steam, High-Temperature Thermal Oil, Hot/Cold Water
• Maximum Operating Temperature: Up to 200°C - 230°C (depending on graphite seal configuration)
• Maximum Operating Pressure: Up to 1.5 - 2.0 MPa (~15 - 20 bar)
• Maximum Rotation Speed: 300 - 600 RPM (optimized for large-diameter processing cylinders)
• Connection Standard: Heavy-Duty JIS Flanged Standard or Specialized Coupling