Heavy Duty Hydraulic Rotary Union for 50-Ton Excavator Electric Retrofit – Anti-Hose Twist Slew Swivel Joint
1. Product Overview
Built for the toughest job sites, this heavy-duty hydraulic rotary union is engineered specifically for 50-ton class excavator oil-to-electric (diesel-to-electric) retrofit projects. It solves the most common failure in continuous slewing: hydraulic hose winding, kinking, bursting and unplanned downtime.
By transferring high-pressure hydraulic oil between the stationary and rotating structures, the joint enables unlimited 360° rotation while keeping the hydraulic circuit stable, leak-free and maintenance-friendly.
2. Core Configuration
Main Power Circuits (A & B)
- Medium: Hydraulic oil
- Design pressure: 40 MPa (6000 PSI)
- Rotor interface: SAE 1-1/2″ 6000 PSI
- Stator interface: 2 × SAE 1″ 6000 PSI
- Flow orifice: Φ40
- Application: high-flow, high-pressure transmission for heavy-load slew drive
BR Control / Return Circuits
- 2 independent passages
- Design pressure: 15 bar
- Interface: G1/2″
- Flow orifice: Φ15
- Application: pilot control oil or return line, isolated from main power loop
3. Key Features
- Eliminates Hose Twisting & Bursting
Continuous 360° rotation with no dead point — hoses never wind, kink or snap during long-cycle slewing. - High-Low Pressure Separation
A/B 40MPa main circuits + BR 15bar control circuits work independently for more stable system response. - Built for Heavy Loads
Φ40 high-flow orifice handles large hydraulic volume required by 50T-class excavator slew motors. - Slow-Speed, High-Torque Optimized
Max speed ≤5 RPM, bidirectional rotation — ideal for precise, heavy-duty swinging. - Jobsite-Proven Durability
Operating temperature -20°C to +80°C, resistant to dust, thermal shock and open-air conditions. - Electrification-Ready
A core component for excavator oil-to-electric conversion, keeping rotary action smooth after removing the diesel powertrain.
4. Technical Specifications
| Passage No. | Rotor Interface | Stator Interface | Flow Orifice | Medium | Design Pressure | Operating Speed | Operating Temp. | |
|---|---|---|---|---|---|---|---|---|
| Br | 2-G1/2″ | 2-G1/2″ | 2-Φ15 | Hydraulic Oil | 15 bar | ≤5 RPM | -20℃~+80℃ | |
| A | SAE1-1/2″ 6000PSI | 2-SAE1″ 6000PSI | Φ40 | Hydraulic Oil | 40 MPa | ≤5 RPM | -20℃~+80℃ | |
| B | SAE1-1/2″ 6000PSI | 2-SAE1″ 6000PSI | Φ40 | Hydraulic Oil | 40 MPa | ≤5 RPM | -20℃~+80℃ |
5. Application Scenarios
- 50-ton class excavator electric retrofit / diesel-to-electric conversion
- Heavy-duty slew drive systems
- Mining excavators, large crawler excavators
- Continuous-rotation hydraulic platforms
- Cranes, material handlers and rotating attachments requiring twist-free hydraulic transfer
6. Why Choose Us
- Engineering review before order — we cooperate on parameter confirmation and drawing modification
- Drawing-based customization: passage number, interface size, orifice, seal material and mounting style
- Compatible with hybrid and fully electric excavator architectures
- Strict leakage test and pressure test before shipment
- OEM / ODM support for machinery manufacturers and retrofit integrators
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