Product introduction
When water or coolant needs to move between a fixed supply line and a rotating shaft, a rotary union provides the connection without restricting normal machine movement. These Rotary Unions for Water and Coolant are designed for equipment where fluid transfer, rotational speed, pressure, and sealing performance all need to work together. They can be configured according to the machine structure, connection method, media, and operating conditions, making them suitable for OEM equipment and replacement applications.
Product parameters
Fluid：
Water, Oil
Materials of housing：
Carbon Steel/Stainless Steel
Seal structure：
Multi-springs Balanced Mechanical Seal
Housing connection：
Thread/ Flange
Size:
From 32A to 300A
PN max：
0.8Mpa
Speed max：
1000RPM
T max：
180℃
Typical characteristics
Good Sealing
The rotary unions for water and coolant adopts a multi-spring balanced mechanical seal structure. The sealing surface is pressed by multiple springs at the same time, so that the contact surface fits evenly and avoids leakage caused by single-point force. This structure allows the equipment to run for a long time without dripping at a speed of up to 1000RPM and a high temperature of 180°C.
Strong Interface Compatibility
International-standard threaded (BSP/NPT) and flange connections allow direct compatibility with most equipment interfaces-no adapters needed-simplifying installation, shortening commissioning time, and reducing accessory costs.
High Pressure Bearing Capacity
Rotary union for water/coolant: max pressure 0.8 MPa, well above the typical 0.4–0.6 MPa working pressure, ensuring stable, burst- and leak-free operation under pressure fluctuations or peak demand.
Dynamic Balance Optimization
All rotary unions for water and coolant are dynamically balanced to control the eccentricity within 0.02mm. This allows the joint to maintain a stable center of gravity during high-speed rotation, reducing vibration caused by uneven rotation, thereby reducing the impact on the equipment bearings and extending the life of the entire machine shaft system by more than 30%.
Parameter Table
| Parameter | Specification |
|---|---|
| Media | Water, coolant, oil |
| Housing Material | Carbon steel / Stainless steel |
| Seal Structure | Multi-spring balanced mechanical seal |
| Connection Type | Threaded (BSP/NPT) or flanged |
| Size Range | 32A – 300A |
| Max. Pressure | 0.8 MPa (standard) / Up to 1500 psi for coolant-specific models |
| Max. Speed | 1000 RPM (standard) / Up to 1500 RPM |
| Max. Temperature | 180°C |
Products Description
Stable fluid transfer
Maintains a continuous passage for water, water-based coolant, or suitable cooling fluids while the shaft rotates.
Balanced sealing
Mechanical or precision sealing structures help control leakage during continuous rotation.
Flexible connections
Threaded, flange, axial, or radial configurations can be selected according to installation space.
Compact construction
A space-saving body makes installation easier around machine spindles, rollers, and rotating shafts.
Multiple configurations
Single-passage and multi-passage designs are available for different fluid-transfer requirements.
High-speed options
Selected models can support high rotational speeds when matched with suitable seals and operating conditions.
FAQ
Q: What media can these rotary unions handle?
A: They transfer water, water-based coolants, and oils between stationary piping and rotating equipment .
Q: What pressure and temperature can they withstand?
A: Standard units handle up to 0.8 MPa (approx. 116 psi) at 180°C . Coolant-specific models can reach up to 1500 psi, depending on configuration .
Q: How do they prevent leakage during rotation?
A: They use a multi-spring balanced mechanical seal that distributes pressure evenly across the sealing faces, preventing single-point force leaks even at high speeds .
Q: Can they run dry?
A: Generally not recommended. Mechanical seals require the fluid for lubrication and cooling. Running dry can damage the seal faces and cause premature failure.
Q: What connection types are available?
A: Threaded connections (BSP/NPT) and flanged connections are both available to match most equipment interfaces without requiring adapters .
Hot Tags: rotary unions for water and coolant, China rotary unions for water and coolant manufacturers, suppliers, factory, 24 corrugated pipe coupling
