The D Series Rotary Union is a type of rotating joint that allows the transfer of fluid (such as water, oil, air, or coolant) from a stationary supply to a rotating machine component. The “D Series” typically features a balanced mechanical seal design, compact housing, and single or dual-flow passage options. The unions feature a dual flow independent design, allowing two different fluids or gases to rotate simultaneously at different pressures without mixing. This capability is critical in complex hydraulic, pneumatic, and process systems where multiple media must be transferred through a rotating interface safely and efficiently. Engineered to handle temperatures up to 100–110°C and pressures up to 70 bar, this rotary union series is ideal for applications requiring reliable dual-flow independent fluid passage with minimal cross-contamination.
Constructed from premium-grade stainless steel (SS 304/316), brass, or carbon steel, ensuring corrosion resistance and longevity in harsh environments.
Handles up to 3000 PSI (customizable up to 5000 PSI) for heavy-duty operations.
Operates efficiently from -30°C to 250°C (-22°F to 482°F), making it suitable for steam, hot oil, and coolant applications.
Available in 1/4” to 1.5” NPT/BSP threads, with custom sizes upon request.
Delivers smooth rotation at up to 1500 RPM (higher speeds available for specialized needs).
Utilizes PTFE or nitrile seals for chemical and thermal resistance, minimizing maintenance and leaks.
The D Series rotary union is widely used in industries such as:
Hydraulic and pneumatic machinery
Agricultural and construction equipment
Oil & gas drilling and processing
Paper and printing machinery
Steel and metal stamping
Automation and robotics
Food and beverage processing
Its robust design makes it suitable for fluid transfer in power steering systems, hose winders, vacuum and air applications, and other rotating equipment requiring high reliability and minimal maintenance.
Independent dual passages prevent cross-contamination between fluids, maintaining purity and system integrity.
High-speed capability up to 5000 rpm supports dynamic industrial processes.
Durable mechanical seals extend service life and reduce downtime
Versatile mounting options, including shaft and flange designs for easy integration;
Customizable configurations to meet specific pressure, temperature, and thread requirements.
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THE WORLD'S LEADING ROTARY UNIONS MANUFACTURERS
