Rotary Unions for High-Performance Applications
SREG rotary unions are designed for the reliable transfer of liquids, gases, and other media between a stationary source and rotating machinery.
Also known as rotary joints, pneumatic rotary unions, rotating unions, or multi-port feeders, these fittings provide uninterrupted flow through multiple passages or channels of oil, steam, air, hydraulic oil, thermal oil, coolant, and other processed fluids through a rotating shaft. Built to function in high-pressure environments, withstand constant movement, and deliver consistent output in demanding systems with many moving parts, they provide long-term reliability.
Applications of Rotary Unions
- Hydraulic oil transfer in wind turbines for pitch control.
- Steam, thermal oil, and water circulation in food and beverage processing.
- Coolant delivery to CNC spindles and metalworking.
- Gas and fluid management in chemical vessels.
- Air and ink supply in high-speed printing machinery.
- Multi-hose, hose reels for both onshore and offshore.
- Fuel feed for rotating furnaces and ovens.
Rotary Joints
- Seal materials designed for durability – oil, steam, gas, air, coolant, and other fluids.
- High- and low-pressure – media-transfer systems.
- Smooth rotation – constant, staged, and reciprocating movement of rotating shafts and moving parts.
- Customised designs – single passage to multi-channel rotary unions.
- Simultaneously transfer different media through multiple individually sealed channels, which can have differing bore sizes and operating parameters.
- Varied options – select the right rotary joint or rotating union for your media and duty.
- Flexible connections – threaded, flanged, or bespoke pipe fittings.
Designed for Transfer
- Pressurised systems involving rotation.
- Thermal oil and steam transfer at high temperatures.
- Coolant and fluid circulation in rotating tools and process systems.
- Air and gas transfer in pneumatic and chemical applications.
- Stationary-to-rotating connections where media passage is critical.
Selection & Specification Guide
Choosing the right rotary union goes further than just size. Consider:
- Media and temperature – select the correct seal material for oil, steam, air, gas, coolant, thermal oil, or other fluids.
- Working pressure – is the rotary joint rated for your system’s pressure?
- Rotation – intermittent or constant movement of the rotating shaft.
- Passages – single or multi-channel; size of channels.
- Connections – match the pipe or fitting type.
- Connectivity – safeguard with the correct interface between stationary and rotating equipment.
Industry Examples
We supply rotary unions to many industries worldwide:
- Printing – multi-passage rotating unions for ink and air.
- Wind energy – hydraulic oil through rotating shafts.
- Food processing – steam and thermal oil in rotating vessels.
- Metalworking – coolant to high-speed CNC spindles.
- Chemical plants – gas and fluid control in rotary reactors.
- Pneumatic systems – a pneumatic rotary union connects compressed air lines to rotating drums.
- Remote operated vehicles (ROVs) – supply and communication lines, both onshore and offshore.
Maintenance & Dependability
To maximise performance from your rotary joints:
- Review seals and seal compounds regularly.
- Monitor pressure for unexpected drops.
- Watch for vibration, noise, or overheating in moving parts.
- Replace worn rotary joints promptly to minimise downtime.
- Keep spare seal kits, other critical parts, and compatible transfer fluid in stock.
Why SREG Rotary Unions
- Wide range of rotary unions and rotary joints for different industries.
- Proven expertise in seal materials for hydraulic oil, thermal oil, steam, air, gas, coolant, and other media transfer.
- Customised engineering for unique configurations, pressures, rotations, and duty conditions.
- Fast delivery and worldwide support.
Quality Assurance
- Hydrostatic and leak testing to project standards.
- Certified seal materials and traceable components.
- Optional third-party inspections on request.
Get a Quote
Ready to specify your rotary union?
Tell us your duty conditions — media, pressure, temperature, and rotation requirements. Our engineers will recommend the right rotary union, with the correct seal materials, bearings, and pipe connections for safe and efficient operation.
FAQs
Q: Can your rotary unions handle corrosive or aggressive media?
A: Yes — with the correct seal and hardware materials for the chosen fluid, gas, or coolant.
Q: What pressure ranges can you cover?
A: Our rotary unions are designed for high pressure, up to 1000 BAR.
Q: Can pneumatic rotary unions be combined with slip rings?
A: Yes — for combined fluid transfer and electrical signals.
Q: Do you provide both standard and custom rotary joints?
A: Yes — from simple single-passage to complex multi-channel rotary unions.
Q: Are they suitable for constant movement?
A: Yes — our designs are optimised for both intermittent use and continuous rotation of the shaft.
