Water rotary union GP 12

for oilfor vacuumfor gas

Product Overview
The GP Series 12-passage rotary unions provide twelve independent fluid passages in a single rotating assembly, enabling simultaneous transfer of different media under vacuum and bidirectional pressure conditions. Standard construction uses carbon steel with black oxide finish; stainless steel options are available for corrosion resistance or water/corrosive media service.

Key Features

• 12 independent flow passages for simultaneous transfer of multiple media
• Sealing technology suitable for vacuum service and bidirectional pressure
• Standard housing and shaft: Carbon Steel (Black Oxide); stainless steel options available
• Standard side-threaded connections: NPT or BSPP
• Optional O-ring face-seal glands for flush mounting (must be specified at order)
• Designed for integration with electrical slip rings to combine fluid and electrical/data transfer
• Typical compatible media: Air/Gas, Coolant, Oil/Hydraulic, Water/Glycol (use rust inhibitors for aqueous coolants; oil/hydraulic fluids must be petroleum-based)

Representative Configurations

• GP-201-12 — 1/4"-18 NPT (also offered with BSPP) — Passage 0.250" [6.35 mm] — Diameter 4.437" [112.7 mm] — Length 13.380" [339.85 mm] — Through bore 0.750" [19.05 mm] — Min. torque 19.2 ft-lbs [26.03 Nm]
• GP-301-12 — 3/8"-18 NPT (also offered with BSPP) — Passage 0.375" [9.525 mm] — Diameter 4.937" [125.4 mm] — Length 15.370" [390.40 mm] — Through bore 0.750" [19.05 mm] — Min. torque 26.2 ft-lbs [35.52 Nm]

Available Options

• Custom modifications to adapt standard products to project requirements
• Electrical slip ring integration for combined fluid and electrical/data transfer
• O-ring face-seal gland option instead of side-threaded connections for flush mounting

Performance & Data

• Pressure vs. torque and pressure vs. speed performance charts available for GP Series models
• Multiple pressure and speed options across series variants; see representative configurations

Specifications

• Maximum Pressure: 7,500 PSI [515 BAR]
• Maximum Speed: 500 RPM
• Maximum Vacuum: 30 HG
• Temperature Range: 0° F to 220° F [-18° C to 105° C]; higher-temperature applications require alternative seal materials
• Suitable Media: Air/Gas; Coolant (with rust inhibitors); Oil/Hydraulic (petroleum-based); Water/Glycol (with rust inhibitors); other media via custom solutions
• Connection Types: NPT and BSPP standard; additional connection types on other series
• Housing Material: Carbon Steel (Black Oxide); stainless steel optional for corrosion resistance
• Shaft Material: Carbon Steel (Black Oxide); stainless steel options available
• Shaft Connection Options: Standard side-threaded connections; optional non-threaded O-ring face-seal glands for flush mounting; threaded interface mounting holes
• Passage Size Examples: 0.250" (6.35 mm) and 0.375" (9.525 mm)
• Through Bore Example: 0.750" [19.05 mm]
• Minimum Torque to Rotate (examples, zero pressure): GP-201-12 = 19.2 ft-lbs [26.03 Nm]; GP-301-12 = 26.2 ft-lbs [35.52 Nm]