Water rotary union SE 4

for oilfor gasfor air

Overview
DSTI SE Series 4-passage rotary unions provide four independent flow passages in a compact design for high-pressure, space-limited applications. Standard radial threaded connections on shaft and housing (SAE-ORB/BSPP); optional axial O-ring face-seal connections for face/flush mounting (specify at order). Designed for mechanical integration with electrical slip rings to combine fluid and electrical/data transfer.

Key design / features

• Four independent flow passages (4-passage design)
• Compact form factor for high-pressure, space-limited applications
• Standard radial threaded connections on shaft and housing; optional axial O-ring face-seal connections
• Mechanical integration with standard electrical slip rings for combined fluid and electrical/data transfer

Example configuration (single model sample)
Part: SE-1141 [SEM-1141]
Connection: #4 SAE-ORB (also shown with G1/8"-28 BSPP notation)
Passage size: 0.187" [4.75 mm]
Diameter (body): 2.937" [74.6 mm]
Length: 4.828" [122.63 mm]
Through bore: 0.375" [9.525 mm]
Minimum torque to rotate (zero pressure, Oil/Hydraulic): 38 in-lbs [4.29 Nm]
Downloads available: PDF Catalog, PDF Drawing, DWG (2D), STEP (3D), Installation & Mounting document

Performance / selection highlights
Maximum Pressure (select series)
200 PSI [15 BAR] — SPS, LT, SE, GP, GPS, SCS, HVH, HPS
600 PSI [40 BAR] — SPS, LT, SE, GP, GPS, HVH, HPS
5,000 PSI [345 BAR] — SE, GP, GPS, HVH, HPS
7,500 PSI [515 BAR] — SE, GP, GPS, HPS
20,000 PSI [1,375 BAR] — HPS
Other — Custom options available

Maximum Speed (select series)
20 RPM — SPS, LT, SE, GP, GPS, SCS, HVH, HPS
50 RPM — SPS, LT, SE, GP, GPS, SCS, HPS
75 RPM — SPS, LT, SE, GP, GPS, SCS
300 RPM — SPS, LT, SE, GP, GPS, SCS
500 RPM — SPS, LT, GP, GPS, SCS
Other — Custom options available

Connection Types (select series)
ASME-BPE — SCS
BSPP — SE, GP
BSPT — LT
NPT — SPS, LT, GP, GPS
SAE-ORB — SE, HVH
Medium Pressure — HPS
Other — Custom options available

Suitable media (select series)
Air/Gas — SPS, LT, SE, GP, GPS, SCS, HVH, HPS
Chemical — GPS, SCS, HPS
Coolant — SE, GP, GPS, SCS, HPS
DI / Tap Water — GPS, SCS, HPS
Food-Grade — SCS
Oil / Hydraulic — SE, GP, GPS, SCS, HVH, HPS
Steam — Custom designs
Water / Glycol — SE, GP, GPS, SCS, HPS

Notes / cautions
Use rust-inhibited fluids for Water/Glycol or Coolant. Oil/Hydraulic media must be petroleum-based. Operational life depends on rotational speed and duty cycle; continuous operation near maximum speed may reduce life. Temperatures above 220°F (105°C) or water media above 212°F (100°C) require alternate seal materials and special material/seal selections.

Technical specifications

• Series: SE Series (4-passage variants)
• Maximum pressure (typical SE 4-passage rating shown): 7,500 PSI [515 BAR]
• Maximum speed (typical high-speed option shown): 300 RPM
• Maximum vacuum: 30 in Hg
• Temperature range: 0°F to 220°F [-18°C to 105°C]; higher temperature service requires alternate seal materials
• Connection types: SAE-ORB (radial), BSPP; radial threaded ports standard; axial O-ring face-seal optional (specify at order)
• Housing material: Carbon Steel (Black Oxide finish)
• Shaft material: Carbon Steel (Black Oxide finish)
• Shaft connection options: Radial & axial connections; standard radial SAE-ORB/BSPP (plugged if axial selected); optional axial O-ring face seal; threaded mounting holes; shaft flange and housing flange optional
• Suitable media: Air/Gas, Coolant, Oil/Hydraulic, Water/Glycol; series-specific options for chemical, DI/tap water, food-grade, steam and other custom media
• Integration: Designed to integrate with electrical slip rings for combined fluid and electrical/data transfer
• Typical minimum torque to rotate (example SE-1141, zero pressure, Oil/Hydraulic): 38 in-lbs [4.29 Nm]
• Available documentation: SE Series Catalog (PDF), Installation & Mounting (PDF), model drawings (PDF/DWG/STEP)