Steam Rotary Unions
Every day, leading OEMs integrate DSTI's steam rotary unions into their equipment for a reliable high-quality fluid sealing solution.
View steam rotary unionsOur happy customers who drive us to continuously improve
Flexible solutions for steam rotary unions with a variety of options to fit your media, pressure, speed, and temperature requirements.
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Select Your Specifications
Media Type
Select
- Air/Gas
- Chemical
- Coolant
- DI/Tap Water
- Food-Grade
- Oil/Hydraulic
- Steam
- Water/Glycol
- Other
Flow Passages
Select
- 1 Passage
- 2 Passages
- 3 - 4 Passages
- 5 - 6 Passages
- 7 - 8 Passages
- 9 - 10 Passages
- 11 - 12 Passages
- Over 12 Passages
Max. Pressure
Select
- Vacuum
- 0 - 200 PSI [0 - 15 BAR]
- 201 - 600 PSI [15 - 40 BAR]
- 601 - 5,000 PSI [40 - 345 BAR]
- 5,001 - 7,500 PSI [345 - 515 BAR]
- 7,501 - 20,000 PSI [515 - 1,375 BAR]
- Over 20,000 PSI [1,375 BAR]
Max. Speed
Select
- 0 - 50 RPM
- 51 - 75 RPM
- 76 - 300 RPM
- 301 - 500 RPM
- Over 500 RPM
Flow Passage Size
Select
- Under 1/8" [3.18mm]
- 1/8" - 3/16" [3.18mm - 4.76mm]
- 1/4" - 3/8" [6.35mm - 9.53mm]
- 1/2" - 3/4" [12.70mm - 19.05mm]
- 7/8" - 1" [22.23mm - 25.40mm]
- 1-1/4" - 1-1/2" [31.75mm - 38.10mm]
- 2" - 3" [50.8mm - 76.20mm]
- Over 3" [76.20mm]
Overview
At DSTI, our lineup of steam rotary unions are engineered to provide reliable sealing and efficient steam transfer between stationary piping and rotating equipment. Our advanced rotary joints for steam are engineered to handle high-speed applications under demanding conditions where precise temperature control and long-lasting performance are critical.
DSTI’s pressure joints and mechanical seal unions are trusted across industries such as metal production, plastic molding, food and beverage processing, and energy. Across these crucial industries, mechanical seal unions for steam have applications in heating, drying, and power generation.
We offer a full product line of standard rotary unions built to withstand high pressures, extreme temperatures, and continuous operation. If none of our standard rotary joints is a good fit, our team can provide custom steam rotary union solutions. From modifying an existing design to building a prototype based on your design specs, we deliver products with top-tier wear resistance, superior temperature control, and precision steam handling.
Steam Rotary Unions FAQs
What is a steam rotary joint?
A rotary joint for steam, also known as a steam rotary union, is a mechanical device that transfers steam from a stationary supply line into rotating equipment. It maintains a secure seal while allowing rotation to provide efficient, leak-free transfer of steam between components.
These pressure joints are widely used in applications requiring precise temperature control, such as heated rolls, dryers, and process equipment in industries like food and beverage, oil and gas, plastic molding, and metal production. By withstanding high pressures and temperatures, steam rotary joints provide reliable operation, reduce downtime, and extend the life of rotating machinery.
What pressure and temperature ratings are available for steam rotary unions?
Steam rotary joints are engineered to withstand the high-temperature, high-pressure conditions of steam transfer. Standard rotary joints for steam typically operate at pressures up to 150–300 PSI / 10–20 BAR. Most steam rotary unions can endure temperatures of 350°F–400°F / 175°C–205°C.
For more demanding applications, DSTI can develop custom mechanical seal unions with specialized materials.
What makes DSTI steam rotary joints reliable in high-temperature applications?
At DSTI, our steam rotary joints are built with specialized sealing technologies and durable metals that withstand extreme heat and pressure. Many of our designs use mechanical seal unions or self-supporting seals that maintain tight sealing even during thermal expansion. We use high-grade alloys and precision-engineered components that offer superior wear resistance in continuous-duty applications. You can rely on our rotary joints for steam to provide stable temperature control, extended service life, and reliable performance in high-temperature environments.
Can steam rotary joints be customized?
Yes, DSTI's steam rotary joints can be fully customized to meet the demands of any client's applications. Our customization options include:
• Seal type (such as mechanical seal unions for higher pressures and temperatures)
• Connection size and orientation
• Pressure ratings
• Temperature ratings
• Material selection to handle corrosive environments
• Specialized coatings for extended service life
• Flow passage design, including multi-passage configurations
Are there multi-passage rotary unions available for combined steam and other media?
At DSTI, we manufacture several different multi-passage rotary unions that can simultaneously transfer steam and other media, such as water and thermal oil. Our multi-passage steam rotary unions include:
• GP Series - 2-12 passages, max speed of 500 RPM, max pressure of 7,5000 PSI / 515 BAR
• GPS Series - 2-12 passages, max speed of 500 RPM, max pressure of 7,5000 PSI / 515 BAR
• HPS Series - 1-16 passages, max speed of 50 RPM, max pressure of 20,000 PSI / 1,375 BAR
• HVH Series - 4-6 passages, max speed of 20 RPM, max pressure of 500 PSI / 345 BAR
• LT Series - 2-24 passages, max speed of 500 RPM, max pressure of 600 PSI / 40 BAR
• SE Series - 2-24 passages, max speed of 300 RPM, max pressure of 7,5000 PSI / 515 BAR
If none of our standard multi-passage rotary joints for steam meet your application needs, we can also engineer custom solutions for you.
How does the union design prevent leakage in high-pressure steam environments?
Steam rotary unions are engineered with advanced sealing systems that keep steam contained even under high pressure. Many models use mechanical seal unions with precision lapped seal faces that create a tight barrier against leakage.
DSTI's steam rotary joints are built with high-quality materials that resist thermal expansion and corrosion. These design features enable our rotary unions to maintain leak-free sealing and efficient temperature control in high-pressure steam transfer applications.
