Water rotary union HPS

for oil3-passagehigh-pressure

Overview
DSTI HPS Series 3-passage rotary unions provide three independent fluid passages with a specialized sealing system rated for up to 20,000 PSI (1,375 BAR). Standard construction is all stainless steel with medium-pressure housing connections and O-ring gland shaft connection, designed for harsh marine and offshore environments. Configurations and materials can be modified to meet application-specific requirements.

Example configuration (HPS-4330)
Part #: HPS-4330 [HPSM-4330]
Connection: 3/8" OD, 9/16"-18 UNF Medium Pressure
Passage size: 0.203" [5.156 mm]
Diameter: 4.437" [112.7 mm]
Length: 7.530" [191.262 mm]
Through bore: None
Min. torque*: 25.5 ft-lbs [34.57 Nm] (at zero pressure with oil/hydraulic media)

Performance

• Maximum pressure (series capability): up to 20,000 PSI [1,375 BAR] — HPS
• Series pressure mapping: 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)
• Maximum speed (typical series ranges): up to 50 RPM for HPS depending on configuration; other series support up to 500 RPM or custom solutions

Connection types & suitable media

• Connection types: Medium Pressure (standard for HPS). Other standards available: ASME‑BPE, BSPP, BSPT, NPT, SAE‑ORB — custom solutions possible.
• Suitable media (series mapping): Air/Gas; Oil/Hydraulic; Water/Glycol; Coolant; DI/Tap Water; Chemical (depending on series and seal material). Steam and other media available with custom seals.

Available options / Customization

• Modifications to mounting configuration, housing or shaft dimensions and connections.
• Custom sealing systems and alternate seal materials for high-temperature or specific media.
• Integration of electrical slip rings for combined fluid and electrical transfer.
• Pressure and speed tuning across series; fully custom solutions on request.

Notes
Operational life depends on rotational speed, duty cycle and media. Applications above 220°F (105°C) require alternate seal materials. Use of water above 212°F (100°C) also requires alternate seals. Minimum torque values apply at zero pressure with oil/hydraulic media; torque may increase for different media or dry running.

Technical specifications

• Series: HPS Series (3-passage)
• Design: Three independent flow passages
• Maximum pressure (series capability): up to 20,000 PSI [1,375 BAR]
• Typical maximum speed: up to 50 RPM (series-dependent)
• Connection type: Medium Pressure (standard)
• Shaft connection: O-ring gland shaft connection (standard)
• Housing material: Stainless steel (suitable for marine/offshore)
• Shaft material: Stainless steel (TDC finish)
• Example passage size (HPS-4330): 0.203" [5.156 mm]
• Example dimensions (HPS-4330): Ø 4.437" [112.7 mm], L 7.530" [191.262 mm]
• Through bore (example): None
• Minimum torque (example HPS-4330): 25.5 ft-lbs [34.57 Nm]
• Operating temperature range: 0°F to 220°F [-18°C to 105°C] (higher temps require alternate seal materials)
• Suitable media: Oil/Hydraulic, Water/Glycol, Air/Gas, Coolant, DI/Tap Water, Chemical (series-dependent)