The DSTI SE Series (Space-Efficient / High-Pressure) Multi-Passage Rotary Unions, engineered and manufactured by Dynamic Sealing Technologies, Inc. (DSTI - USA), deliver exceptional high-pressure fluid sealing performance housed within an ultra-compact body envelope, specifically tailored to solve severe space-constraint challenges in advanced industrial automation and heavy machine tool setups.

The SE Series is widely recognized as a benchmark solution for machine designers and automation engineers who require multi-circuit fluid delivery under intense hydraulic conditions. The series is comprehensively scaled across seven distinct channel configurations: SE-1121 (2 passages), SE-1141 (4 passages), SE-1161 (6 passages), SE-1181 (8 passages), SE-11121 (12 passages), SE-11161 (16 passages), and the high-density SE-11241 (24 independent passages).

Key Engineering Features & Operational Advantages:
- Compact, Space-Efficient Form Factor: Unlike traditional high-pressure swivel joints that become bulky and cumbersome as passage counts increase, the DSTI SE Series features an optimized outer diameter (starting at just 2.937" / 74.6 mm) and reduced axial length. This allows direct integration into the center of rotary indexing tables, CNC machine spindles, and tight robotic end-of-arm tooling without intruding on tooling envelopes.
- Extreme High-Pressure Capability up to 7,500 PSI (515 BAR): Utilizing DSTI's specialized dynamic sealing technology, the SE Series reliably manages bidirectional operating pressures up to 7,500 PSI (515 BAR) as well as deep industrial vacuum conditions (30 in. Hg), with zero pressure drop or premature seal deterioration.
- Zero Cross-Channel Contamination: Each individual flow channel is mechanically isolated by high-integrity dynamic seals paired with atmospheric drain relief pathways. This permits users to route completely different fluid types simultaneously (such as high-pressure petroleum-based hydraulic fluid for workholding clamping, compressed air for part-seating detection, and coolant/water-glycol for tool cooling) without cross-contamination.
- Heavy-Duty Carbon Steel Construction: Precision-machined entirely from premium carbon steel and protected with a corrosion-resistant black oxide finish, delivering exceptional structural stiffness, wear resistance, and long-term durability in harsh, oil-laden machining environments.
- Central Through-Bore (0.375" / 9.525 mm) & Direct Slip Ring Integration: Standard models incorporate a central through-hole opening, allowing routing of drive shafts, auxiliary plumbing, or electrical cables. Furthermore, SE Series units are designed to mate directly with DSTI standard through-bore electrical slip rings, forming a unified hybrid rotary transmission system for fluid, electrical power, servo motor control, and real-time industrial communication networks (Ethernet, EtherCAT, Profinet).

Typical Industrial Applications:
- Multi-station hydraulic workholding clamping fixtures and rotary index tables on 4-axis and 5-axis CNC machining centers.
- Heavy-duty robotic end-of-arm tooling (EOAT) in metal stamping, bending, spot welding, and component pressing.
- Plastic injection molding machines, blow molding carousels, and rubber vulcanizing presses.
- High-pressure hydraulic umbilical hose reels, test stands, and military/aerospace rotating test platforms.

• Manufacturer: DSTI (Dynamic Sealing Technologies, Inc.)
• Origin / Country of Manufacture: USA
• Product Series: SE Series Space-Efficient High-Pressure Multi-Passage Rotary Unions
• Model Breakdown & Flow Channels:
  - SE-1121: 2 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
  - SE-1141: 4 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
  - SE-1161: 6 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
  - SE-1181: 8 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
  - SE-11121: 12 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
  - SE-11161: 16 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
  - SE-11241: 24 Independent Passages | #4 SAE (7/16"-20 UN-2B) or G 1/8" BSPP
• Nominal Passage Diameter: 0.156" [3.96 mm] per channel
• Center Through-Bore Diameter: 0.375" [9.525 mm]
• Port Connection Types: Standard #4 SAE-ORB straight thread with O-ring seal, or BSPP metric parallel thread
• Shaft Mounting Options: Standard radial threaded side ports or optional axial O-ring face seal glands (-OF suffix) for flush manifold mounting
• Maximum Operating Pressure: 7,500 PSI [515 BAR]
• Maximum Vacuum Rating: 30 in. Hg
• Maximum Rotational Speed: 300 RPM
• Operating Temperature Range: -18°C to 105°C [0°F to 220°F] (Alternative seal materials available for elevated temperatures)
• Compatible Media: Petroleum-based Hydraulic Oil, Compressed Air/Inert Gas, Water/Glycol, Industrial Coolant (with rust inhibitors)
• Housing Material: Carbon Steel with Black Oxide Finish
• Shaft Material: Carbon Steel with Black Oxide Finish
• Dynamic Sealing Technology: DSTI proprietary high-pressure, low-friction composite seals
• Bearing Configuration: Dual pre-lubricated high-capacity precision deep-groove ball bearings
• Slip Ring Compatibility: Fully engineered for direct mechanical and coaxial mounting with DSTI through-bore electrical slip rings.