Single Pass

Description; 

The RJ-1210 Rotary Joint is a single-pass rotary union designed to transfer one fluid circuit between stationary piping and rotating equipment while maintaining smooth rotation and reliable sealing performance. It is suitable for steam, hot water, thermal oil, chilled water, thermic fluids, cooling water, hydraulic oil, compressed air, and other process media used in continuous industrial service. 

 

Engineered for durability and ease of maintenance, the RJ-1210 combines precision bearing support with advanced mechanical seal technology to reduce leakage, frictional heat, and wear. Carbon/ceramic and carbon/silicon carbide seal face options provide strong wear resistance and dependable performance across demanding operating conditions. 

 

Its compact construction, flexible end connections, and service-friendly design make it well-suited for OEM installation and retrofit applications in dryer cylinders, calendars, rolls, mixers, extruders, coating machines, cooling drums, and similar rotating process equipment. With configurable materials, connection styles, and seal options, the RJ-1210 can be adapted to match specific media, operating temperatures, speed requirements, and plant layouts. 

 

Technical Key Features; 

• Compact and lightweight body for installation in space-constrained rotating equipment. 

• Compact inline configuration suitable for OEM integration as well as retrofit applications. 

• Isolated loading springs help resist fouling and corrosion in steam and thermal-oil applications. 

• Single-pass flow design for one-way media transfer to rotating shafts, rolls, drums, or cylinders. 

• High-precision bearing alignment for smooth, vibration-free operation in continuous-duty applications. 

• Service-friendly design that supports simplified inspection, seal replacement, and routine maintenance. 

• Threaded and flanged connection options to suit a wide range of piping layouts and machine interfaces. 

• Uniform seal face loading to maintain consistent sealing performance across varying speeds and pressures. 

• High load-capacity bearings support elevated radial and thrust loads in roll, drum, and cylinder applications. 

• Precision sealing interface for dependable control of leakage in steam, water, oil, air, and thermal-fluid service. 

• Optimized internal flow geometry helps reduce pressure drop and improve transfer efficiency in demanding service. 

• Low-maintenance architecture helps extend service intervals and reduce downtime in continuous process industries. 

• Seal replacement on the machine may be possible, helping minimize maintenance time and production interruptions. 

• Heavy-duty, bearing-supported construction for stable rotation and reduced sensitivity to shaft runout and misalignment. 

• Customizable configurations available for special media, rotation speeds, port arrangements, and mounting requirements. 

• Low starting and running torque to reduce energy consumption and mechanical wear, especially in high-speed applications. 

• Captured O-ring sealing arrangement provides robust sealing integrity under elevated pressure and temperature conditions. 

• Material options tailored to the medium, including stainless steel, bronze, and compatible elastomers for steam, water, air, and thermal oils. 

• Advanced seal face options, including carbon/ceramic and carbon/silicon carbide, for improved wear resistance and extended service life. 

• Externally mounted springs remain outside the fluid path, helping reduce contamination and thermal degradation in high-temperature service. 

 

 

Service Overview; 

Parameter	Value
Equipment	Dryer cylinders, calender rolls, cooling rolls, rotary drums, mixers, extruders, coating machines, and rotating process equipment
Fluid	Steam, hot water, cooling water, thermal oil, hydraulic oil, compressed air, light process fluids
Service Nature	Continuous or intermittent rotary fluid transfer under temperature, pressure, and speed variation
Operating Mode	Single-pass media transfer between stationary piping and rotating equipment

 

Specifications; 

Item	Min	Max	Typical / Notes
Size	12 mm (0.500”)	300 mm (12.000”)	Threaded BSP/NPT or flanged options, depending on size
Pressure	Vacuum service	20 bar (290 psi)	Typical for steam, water, oil, and air service; higher pressure on request
Temperature	-20°C (-4°F)	+220°C (+428°F)	Depends on seal face and elastomer selection
Speed	—	300 rpm	Application-dependent; lower limits may apply for larger sizes and high-temperature service

 

 

Materials; 

Component	Standard Material	Optional Material	Comment
Housing / Body	Carbon Steel / SS 304	SS 316 / Bronze / Alloy Steel	Selected according to corrosion, temperature, and media compatibility
Shaft / Rotor	SS 304	SS 316 / Hardened Steel	Precision-machined rotating component
Seal Faces	Carbon vs Ceramic	Carbon vs SiC / TC vs SiC	Face pairing is selected based on fluid, pressure, and temperature
Secondary Seals	FKM / NBR	EPDM / PTFE / FEP-encapsulated FKM	Elastomer selected according to steam, oil, chemical, or temperature duty
Bearings	Standard anti-friction bearing steel	High-temperature bearing grade	Supports stable rotation and alignment
Springs / Hardware	SS 304	SS 316 / Hastelloy	Selected for corrosion and temperature resistance

 

Applications; 

• Pulp & Paper Industry: paper machine dryer sections, calender rolls, coating machines, and heated rolls. 

• Pharmaceutical Industry: mixers, dryers, coating machines, reactors, and clean utility rotating equipment. 

• Textile Industry: dryer cylinders, stenters, printing machines, calenders, washing and finishing equipment. 

• General Industry: rotating drums, food processing equipment, packaging machines, and process automation systems. 

• Plastic Industry: extruders, cooling rolls, laminators, mould temperature control systems, and film processing lines. 

• Steel Plants: continuous casting rolls, cooling rolls, rotary tables, annealing lines, and process heating/cooling systems. 

 

Operating Limits; 

Parameter	Value
Pressure	Up to 20 bar (290 psi)
Temperature	-20°C to +220°C (-4°F to +428°F)
Speed	Up to 300 rpm
Size Range	12 mm to 300 mm (0.500” to 12.000”)

 

Engineering note; 

The operating limits and material selections above are typical inferred values for industrial single-pass rotary joints. Final ratings should be verified against actual media, connection size, rotation speed, temperature, pressure, and installation orientation before release for production or catalogue printing.