Vacuum rotary union LT Series

for gasfor air12-passage

Overview
The LT Series 12-passage rotary unions are engineered for air, gas and vacuum applications in automated and robotic systems. Constructed primarily from aluminum with blue anodized housing, these compact unions provide twelve independent flow passages to transfer multiple media simultaneously. Standard models include threaded side connections on shaft and housing; optional O-ring face-seal glands are available for flush mounting and must be specified at order. The LT Series can be integrated with electrical slip rings for combined fluid and electrical transfer.

Key Features

• All-aluminum construction (housing: blue anodization)
• Twelve independent flow passages for simultaneous transfer of multiple media
• Lightweight, compact design suited for automation and robotics
• Standard threaded side connections on shaft and housing; optional O-ring face seal glands for flush mounting
• Shaft material: Aluminum (Electroless Nickel finish)
• Compatible with electrical slip rings for combined fluid and electrical transfer

Performance
Maximum Pressure
600 PSI [40 BAR] (LT Series)

Maximum Speed
500 RPM (LT Series)

Maximum Vacuum
30 HG

Temperature Range
0° F to 220° F [-18° C to 105° C]

Suitable Media
Air/Gas (LT Series). The use of liquid media is not recommended for this product.

Pressure Options

• 200 PSI [15 BAR] — SPS, LT, SE, GP, GPS, SCS, HVH, HPS
• 600 PSI [40 BAR] — SPS, LT, SE, GP, GPS, HVH, HPS
• 5,000–20,000 PSI [345–1,375 BAR] — available in high-pressure series (SE, GP, GPS, HVH, HPS) or custom

Speed Options

• 20–500 RPM depending on series (SPS, LT, SE, GP, GPS, SCS, HVH, HPS)
• Custom speed ratings available by series and configuration

Connection Types

• NPT, BSPT side threaded connections (standard for LT)
• Other standards: BSPP, ASME‑BPE, SAE‑ORB or custom on request

Shaft Connection & Mounting Options

• Standard threaded side connections (plugs used if O-ring face seal is chosen)
• Optional non‑threaded O-ring face seal glands for flush mounting (specify at order)
• Threaded interface mounting holes and shaft flange/housing flange mounts
• Plugged machining holes for custom machining

Materials

• Housing: Aluminum (Blue Anodization)
• Shaft: Aluminum (Electroless Nickel)

Configurations (excerpt)

• LT-21121 (LTM-21121) — 1/8"-27 NPT [Rc1/8"-28 BSPT], Passage Ø 0.156" [3.962 mm], Diameter 2.937" [74.6 mm], Length 6.806" [172.873 mm], Through bore 0.375" [9.525 mm], Min. torque 8 in‑lbs [0.9 Nm]
• LT-23121 (LTM-23121) — 3/8"-18 NPT [Rc3/8"-19 BSPT], Passage Ø 0.375" [9.525 mm], Diameter 4.438" [112.725 mm], Length 14.070" [357.379 mm], Through bore 0.440" [11.176 mm], Min. torque 32 in‑lbs [3.62 Nm]

Notes & Warnings

• Use of liquid media is not recommended for LT Series; select a different series if liquids are required.
• All technical values depend on application parameters; operational life varies with rotational speed and duty cycle.
• Applications exceeding 220° F (105° C) or water above 212° F (100° C) require alternative seal materials—consult factory.

Technical specifications

• Product: LT Series 12‑Passage Rotary Unions & Joints
• Brand: DSTI
• Maximum Pressure: 600 PSI [40 BAR]
• Maximum Speed: 500 RPM
• Maximum Vacuum: 30 HG
• Temperature Range: 0° F to 220° F [-18° C to 105° C]
• Housing Material: Aluminum (Blue Anodization)
• Shaft Material: Aluminum (Electroless Nickel)
• Standard Connections: NPT, BSPT (side threaded)
• Mounting Options: Shaft flange mount, housing flange mount, O‑ring face seal glands for flush mounting
• Suitable Media: Air / Gas (liquids not recommended)
• Available Documents: LT Series Catalog; LT Series Installation & Mounting (PDF)