High Pressure Rotary Unions
Every day, leading OEMs integrate DSTI's high pressure rotary unions into their equipment for a reliable high-quality fluid sealing solution.
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Flexible solutions for high pressure 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
High-pressure rotary unions have applications in many crucial industries, including aerospace, defense, heavy equipment, machine tool, marine, and oil and gas. These products play an invaluable role in each of these industries by allowing for leak-free fluid transfer through a rotating component under significant pressure. Some common applications of high-pressure rotary unions in these industries include:
- Hydraulic swivels on oil drilling rigs
- Through-spindle coolant delivery in machine tools
- Rotating attachments on excavators and cranes
- Radar systems, weapon turrets, and ground support equipment
- Marine winches and cable laying systems
DSTI's product lines of high-pressure rotary unions include:
- GP Series - General purpose multi-passage rotary unions that are built from carbon steel and suitable for air/gas, hydraulic, and coolant. 2-12 flow passages available. Maximum speed of 500 RPM and maximum pressure of 7,500 PSI / 515 BAR.
- GPS Series - General purpose multi-passage rotary unions that are built from stainless steel and suitable for water, coolant, hydraulic, pneumatic, and corrosive media. 2-12 flow passages available. Maximum speed of 500 RPM and maximum pressure of 7,500 PSI / 515 BAR.
- HPS Series - Corrosion-resistant, high-pressure rotary unions that are built from stainless steel and designed for marine applications. Single passage and multi-passage (3-16) models are available. Maximum speed of 50 RPM and maximum pressure of 20,000 PSI / 1,375 BAR.
- SE Series - Multi-passage, high-pressure rotary unions that are built from carbon steel and suitable for hydraulic, water, coolant, and air/gas. 2-24 flow passages available. Maximum speed of 300 RPM and maximum pressure of 7,500 PSI / 515 BAR.
High Pressure Rotary Unions FAQs
What pressure ranges do your high-pressure rotary unions support?
At DSTI, we manufacture many different high-pressure rotary union models to fulfill diverse application needs. The pressure range varies by product, with some of our rotary unions able to handle maximum pressure of 20,000 PSI / 1,375 BAR or even more.
Generally, single passage rotary unions can handle higher pressure ranges than multi-passage rotary unions. Other factors that affect the pressure range of our products include speed, the type of sealing technology being used, and the nature of the media flowing through the high-pressure rotary unions.
What sealing technology is used in high-pressure rotary unions to prevent leakage?
High-pressure rotary unions rely on state-of-the-art sealing technologies to safely manage pressure and prevent leakage under demanding conditions. The most commonly used sealing technologies for high-pressure applications include:
• Mechanical face seals, which are composed of two ultra-flat seal faces pressed together. One face is rotating, the other is stationary. Mechanical face seals are often relied on for high-pressure and high-speed applications due to their top-tier leakage control.
• Hydrostatic seals, which consist of a fluid film that separates the rotating and stationary surfaces, allowing for non-contact sealing. These seals are ideal for high-pressure rotary unions since they endure minimal wear and tear, and have very low torque requirements.
• Polymeric seals, including Lips Seals. These seals compress under pressure to create a tight seal, making them an excellent fit for high-pressure rotary unions. Lip seals and other Polymeric seals of this type are cost-effective, easily installable, and effective in high-pressure and vacuum environments.
Which industries typically require high-pressure rotary unions?
High-pressure rotary unions are commonly used across a wide variety of industries, including:
• Oil & Gas: High-pressure rotary unions must handle hydraulic fluids in excess of 5,000 PSI, harsh environments, and explosive media.
• Machine Tool & CNC: Coolant delivery often requires high-pressure rotary unions for improved machining efficiency and heat control.
• Aerospace & Defense: Flight simulators, weapon turrets, test rigs, radar systems, and more are reliant on high-pressure rotary unions for leak-free fluid transfer.
• Heavy Equipment: High-pressure rotary unions manage hydraulics in moving booms and arms of cranes, excavators, and other equipment.
• Marine: High-pressure rotary unions are well-suited to hydraulic transfer in rotating and harsh saltwater environments.
What is the maximum working pressure for high-pressure models?
Here are specific maximum working pressure statistics for our high-pressure rotary union products:
• 5,000 PSI / 345 BAR - HVH Series
• 7,500 PSI / 515 BAR - GP Series, GPS Series, SE Series
• 20,000 PSI / 1,375 BAR - HPS Series
If none of these standard rotary unions meet your needs, our team can also manufacture custom high-pressure rotary unions suited for applications where maximum working pressure of over 20,000 PSI is required.
How do I select the right high-pressure union for my application?
Determining specific operating parameters and required design features will help you choose which high-pressure rotary union is a perfect match for your application. To guide yourself to the best product, answer the following questions:
• What media do I need to transfer?
• What are my rotation requirements?
• What is the maximum working pressure my high-pressure rotary union needs to handle?
• What temperature range will be involved in my applications?
• Do I need a single fluid passage or multiple passages?
• What materials do I want my high-pressure rotary union to be built from?
• What type of sealing technology do I want to use?
If none of DSTI's standard rotary unions seem to be a great fit for your needs, consider having us manufacture custom high-pressure rotary unions for your business.
