Water rotary union HPS Series

for airfor gasfor chemicals

Overview
DSTI 1‑passage HPS Series rotary unions provide a single independent flow passage with a specialized sealing system rated up to 20,000 PSI [1,375 BAR]. HPS 1‑passage models feature medium‑pressure housing connections, O‑ring gland shaft connections and an all‑stainless steel housing and shaft suitable for harsh marine and offshore environments. Custom modifications to mounting configuration, connections, sealing system and housing or shaft dimensions are available to meet application requirements.

Configurations (selected models)
Part # | Connection | Passage Size | Diameter | Length | Through Bore | Min. Torque
HPS-4310 | 3/8" OD, 9/16"-18 UNF Medium Pressure | 0.203" [5.156 mm] | 3.437" [87.3 mm] | 5.010" [127.254 mm] | None | 6.3 ft-lbs [8.54 Nm]
HPS-4510 | 3/4" OD, 3/4"-14 NPS Medium Pressure | 0.438" [11.125 mm] | 4.437" [112.7 mm] | 5.010" [127.254 mm] | None | 6.3 ft-lbs [8.54 Nm]

Key Features

• Single independent flow passage (1‑passage)
• Maximum pressure capability: 20,000 PSI [1,375 BAR] (HPS Series maximum)
• Standard maximum speed: 50 RPM (series rating)
• Medium‑pressure housing connections with O‑ring gland shaft connections
• All‑stainless steel housing and shaft for corrosion resistance in harsh environments
• Suitable media include Oil/Hydraulic and Water/Glycol (other media available)
• Custom modifications available for mounting, connections, seals, housing and shaft dimensions

Available Pressure Options (summary)
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

Available Speed Options (summary)
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)
ASME‑BPE : SCS
BSPP : SE, GP
BSPT : LT
NPT : SPS, LT, GP, GPS
SAE‑ORB : SE, HVH
Medium Pressure : HPS
Other : Custom

Suitable Media (examples)

• Oil / Hydraulic
• Water / Glycol
• Air / Gas
• Coolant
• DI / Tap Water
• Chemical (select series/corrosion materials)

Notes
All technical values depend on application parameters (rotational speed, duty cycle, media, temperature). Systems operating near maximum speed with continuous duty or temperatures above seal‑material limits may require alternate materials or designs.