Air rotary union HPS Series

for waterfor oilfor steam

Overview
DSTI HPS Series 8-passage rotary unions provide eight independent fluid passages with a specialized sealing system rated up to 20,000 PSI (1,375 BAR). Standard HPS units feature medium-pressure housing connections, O-ring gland shaft connections and all-stainless-steel construction for demanding industrial and marine/offshore environments. Customizations are available for mounting, connections, seals and housing or shaft dimensions to meet application-specific requirements.

Configurations (selected)
Part # | Connection | Passage Size | Diameter | Length | Through Bore | Min. Torque*
HPS-4380 [HPSM-4380] | 3/8" OD, 9/16"-18 UNF Medium Pressure | 0.203" [5.156 mm] | 4.437" [112.7 mm] | 14.630" [371.603 mm] | None | 55 ft-lbs [74.57 Nm]

Pressure Options (summary)
Max. Pressure | 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

Speed Options (summary)
Max. Speed | 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

Connection Types (summary)
Connection Type | Series
ASME-BPE | SCS
BSPP | SE, GP
BSPT | LT
NPT | SPS, LT, GP, GPS
SAE-ORB | SE, HVH
Medium Pressure | HPS
Other | Custom

Suitable Media

• Air / Gas
• Chemical
• Coolant
• DI / Tap Water
• Food‑grade (select series)
• Oil / Hydraulic
• Steam (custom)
• Water / Glycol

Downloads (available)
HPS Series Catalog (PDF), HPS Series Installation & Mounting (PDF).

Notes
• Minimum torque shown is required to rotate at zero pressure for the specified media; torque may be higher for other media or dry running.
• Operational life depends on rotational speed and duty cycle.
• Applications above 220° F (105° C) or water above 212° F (100° C) require alternative seal materials.

Technical specifications

• Series: HPS Series
• Model: HPS Series 8-Passage (8 independent passages)
• Maximum Pressure: 20,000 PSI [1,375 BAR]
• Maximum Speed: 50 RPM (series typical maximum)
• Connection Type: Medium Pressure housing connections (standard)
• Shaft Connection: O-ring gland shaft connections
• Housing Material: Stainless Steel
• Shaft Material / Finish: Stainless Steel (TDC)
• Suitable Media: Oil/Hydraulic, Water/Glycol (also Air/Gas, Chemical, Coolant, DI/Tap Water; others by series or custom)
• Temperature Range: 0° F to 220° F [-18° C to 105° C]
• Maximum Vacuum: N/A
• Example configuration (HPS-4380): passage size 0.203" [5.156 mm], diameter 4.437" [112.7 mm], length 14.630" [371.603 mm], min. torque 55 ft-lbs [74.57 Nm]