Overview
The Johnson Kadant KX4301 rotary union (model 12K52175) is a precision-engineered rotary sealing device designed to transfer media into and out of rotating equipment. Rated for 200 PSI and operating temperatures from -20°F to 220°F, this unit is suitable for demanding industrial applications including textile machinery, printing equipment, and food processing systems. Manufactured by Kadant Johnson—a leader in rotary joint technology since 1930—this unit combines proven sealing technology with durable bearing support for long-term reliability.
Key Features
- Rated for 200 PSI nominal operating pressure with temperature range -20°F to 220°F
- Balanced seal design with ball bearing support for low-vibration operation
- Mechanical seal technology compatible with thermal oil, water, coolant, and hydraulic fluid
- Stainless steel nipple and assembly plate for corrosion resistance
- Fully captured O-rings with seal-loading springs isolated from process media
- Labyrinth seal and drain provisions to protect bearings and extend service life
Technical Specifications
| Manufacturer | Johnson Kadant (Kadant Inc.) |
| Part Number | KX4301 / 12K52175 |
| Maximum Pressure | 200 PSI |
| Operating Temperature Range | -20°F to 220°F |
| Seal Type | Balanced mechanical seal with ball bearing |
| Media Compatibility | Thermal oil, water, coolant, hydraulic oil, condensate |
| Flow Configuration | Single or dual flow |
| Bearing Type | Angular ball bearing (optional tapered roller bearing available) |
| Body Material | Ductile iron with stainless steel components |
| Nipple Material | Stainless steel |
| Industry Standards | ISO rotary union design |
Typical Applications
- Textile & Paper Mills: Steam and thermal oil transfer on heated rollers and dryer cylinders
- Printing Equipment: Coolant circulation and web handling systems
- Food & Beverage Processing: Sanitary fluid transfer in rotating drums and mixers
- Industrial Machinery: Hydraulic fluid and coolant supply to spindles, chucks, and rotary index tables
- HVAC Systems: Condensate and thermal media transfer on rotating equipment
Compatibility & Replacements
Compatible With
- Rotating equipment requiring ISO standard rotary union connections
- Thermal oil heating systems (up to 220°F media temperature)
- Water and coolant circulation systems
- Hydraulic systems rated up to 200 PSI
- Single and dual-flow applications
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator or equipment manufacturer before ordering. Reference the original equipment manual for port size, connection type, and flow rate requirements to ensure proper fit.
Works With
- Standard ISO rotary union port connections
- Thermal oil circulation loops
- Coolant supply and return systems
- Condensate drainage systems
- Dual-flow applications (simultaneous steam and condensate transfer)
