Air rotary union GP 6

for waterfor vacuumfor oil

Product Overview
The GP Series 6‑passage rotary unions provide six independent flow passages for simultaneous transfer of different media. They use specialized sealing technology suitable for vacuum and bidirectional pressure service. Standard construction is carbon steel with a black oxide finish; stainless steel options are available for corrosion resistance and for water or corrosive media transfer. NPT thread models include a shaft configuration that enables mounting via the threaded passages or via O‑ring face seal glands for flush mounting. BSPP thread models are not available with O‑ring face seal glands. The GP Series is designed to integrate directly with electrical slip rings to combine fluid transfer with power, signal or data lines.

Key Features

• Six independent flow passages for simultaneous multi‑media transfer
• Specialized sealing design for vacuum and bidirectional pressure service
• Carbon steel housing and shaft with black oxide finish; stainless steel versions available for corrosion resistance
• NPT thread models: unique shaft configuration enabling threaded or O‑ring face seal gland mounting
• BSPP thread models: not offered with O‑ring face seal glands
• Compatible with electrical slip rings to combine fluids with power, signal or data

Specification Summary
Maximum Pressure — Series 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
Other — Custom

Maximum Speed — Series mapping
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 Type — Series mapping
ASME‑BPE — SCS
BSPP — SE, GP
BSPT — LT
NPT — SPS, LT, GP, GPS
SAE‑ORB — SE, HVH
Medium Pressure — HPS
Other — Custom

Suitable Media — Series mapping
Air/Gas — SPS, LT, SE, GP, GPS, SCS, HVH, HPS
Chemical — GPS, SCS, HPS
Coolant — SE, GP, GPS, SCS, HPS
DI/Tap Water — GPS, SCS, HPS
Food‑Grade — SCS
Oil/Hydraulic — SE, GP, GPS, SCS, HVH, HPS
Steam — Custom
Water/Glycol — SE, GP, GPS, SCS, HPS

Available Configurations

• GP-161 — 1/8"‑27 NPT [G1/8"‑28 BSPP] — Passage Ø 0.156" [3.962 mm] — Diameter 3.187" [80.95 mm] — Length 6.483" [164.67 mm] — Through bore 0.500" [12.7 mm] — Min. torque 6 ft‑lbs [8.13 Nm]
• GP-261 — 1/4"‑18 NPT [G1/4"‑19 BSPP] — Passage Ø 0.250" [6.35 mm] — Diameter 4.000" [101.6 mm] — Length 8.175" [207.65 mm] — Through bore 0.750" [19.05 mm] — Min. torque 9.8 ft‑lbs [13.29 Nm]
• GP-361 — 3/8"‑18 NPT [G3/8"‑19 BSPP] — Passage Ø 0.375" [9.525 mm] — Diameter 4.250" [107.95 mm] — Length 8.963" [227.66 mm] — Through bore 0.750" [19.05 mm] — Min. torque 13.1 ft‑lbs [17.76 Nm]
• GP-460 — 1/2"‑14 NPT [G1/2"‑14 BSPP] — Passage Ø 0.500" [12.7 mm] — Diameter 4.937" [125.4 mm] — Length 10.000" [254.0 mm] — Through bore: None — Min. torque 22.3 ft‑lbs [30.23 Nm]
• GP-561 — 3/4"‑14 NPT [G3/4"‑14 BSPP] — Passage Ø 0.750" [19.05 mm] — Diameter 6.437" [163.5 mm] — Length 13.230" [336.04 mm] — Through bore 1.000" [25.4 mm] — Min. torque 43.3 ft‑lbs [58.71 Nm]

Notes
Water/glycol or coolant media must contain rust inhibitors. Oil/hydraulic fluids must be petroleum‑based. Operational life depends on rotational speed and duty cycle. Applications running near maximum speed with continuous duty, or operating above 220°F [105°C] (or water above 212°F [100°C]) require alternative seal materials.

Technical Specifications

• Maximum Pressure: up to 7,500 PSI [515 BAR] (series capability varies)
• Maximum Speed: up to 500 RPM (series capability varies)
• Maximum Vacuum: 30 HG
• Temperature Range: 0°F to 220°F [-18°C to 105°C]
• Housing Material: Carbon steel (black oxide); stainless steel options available
• Shaft Material: Carbon steel (black oxide); stainless steel options available
• Connection Types: NPT, BSPP (other connections available on select series)
• Suitable Media: Air/gas, coolant, oil/hydraulic, water/glycol (with rust inhibitors); select models for chemical, DI/tap water, food‑grade
• Available Part Numbers: GP‑161, GP‑261, GP‑361, GP‑460, GP‑561