Chemical rotary union GP Series

for oilfor gasfor water

Product description
The GP Series 4-passage rotary unions transfer four independent fluid passages simultaneously, enabling combined transfer of air/gas, coolant, hydraulic oil or other compatible media. Sealing technology is designed for vacuum and bidirectional pressures. Standard construction uses carbon steel with black oxide finish; stainless steel variants are available for corrosion-prone media or water-based applications.

Key features

• Four independent flow passages for simultaneous multi-media transfer
• Sealing suitable for vacuum and bidirectional pressure conditions
• Carbon steel housing and shaft (black oxide); stainless steel options for corrosion resistance
• Connection options: NPT and BSPP (NPT models may include O-ring face seal gland option; BSPP models exclude O-ring face seal glands)
• Unique GP shaft configuration on NPT models for simplified installation and optional flush mounting
• Designed for direct integration with electrical slip rings to combine fluid and electrical/power/signal transfer
• Multiple pressure and speed ratings across GP family to match application requirements

Pressure / Series

• 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

Speed / Series

• 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

• 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

• 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 (with inhibitors) — SE, GP, GPS, SCS, HPS
• Other — Custom

Configurations (examples)

• GP-140 — Connection: 1/8"-27 NPT (also G1/8" BSPP); Passage size: 0.156" [3.962 mm]; Diameter: 2.687" [68.25 mm]; Length: 4.696" [119.28 mm]; Through bore: None; Min. torque: 1.9 ft-lbs [2.58 Nm]
• GP-141 — Connection: 1/8"-27 NPT (also G1/8" BSPP); Passage size: 0.156" [3.962 mm]; Diameter: 2.937" [74.6 mm]; Length: 4.735" [120.27 mm]; Through bore: 0.500" [12.7 mm]; Min. torque: 3.2 ft-lbs [4.34 Nm]
• GP-240 — Connection: 1/4"-18 NPT (also G1/4" BSPP); Passage size: 0.250" [6.35 mm]; Diameter: 3.187" [80.95 mm]; Length: 6.118" [155.40 mm]; Through bore: None; Min. torque: 6.6 ft-lbs [8.95 Nm]
• GP-241 — Connection: 1/4"-18 NPT (also G1/4" BSPP); Passage size: 0.250" [6.35 mm]; Diameter: 3.750" [95.25 mm]; Length: 6.327" [160.71 mm]; Through bore: 0.750" [19.05 mm]; Min. torque: 9.5 ft-lbs [12.88 Nm]
• GP-340 — Connection: 3/8"-18 NPT (also G3/8" BSPP); Passage size: 0.375" [9.525 mm]; Diameter: 3.875" [98.43 mm]; Length: 6.980" [177.29 mm]; Through bore: None; Min. torque: 9.5 ft-lbs [12.88 Nm]
• GP-341 — Connection: 3/8"-18 NPT (also G3/8" BSPP); Passage size: 0.375" [9.525 mm]; Diameter: 4.187" [106.35 mm]; Length: 7.372" [187.25 mm]; Through bore: 0.750" [19.05 mm]; Min. torque: 11.9 ft-lbs [16.13 Nm]
• GP-440 — Connection: 1/2"-14 NPT (also G1/2" BSPP); Passage size: 0.500" [12.7 mm]; Diameter: 4.250" [107.95 mm]; Length: 8.247" [209.47 mm]; Through bore: None; Min. torque: 11.9 ft-lbs [16.13 Nm]
• GP-441 — Connection: 1/2"-14 NPT (also G1/2" BSPP); Passage size: 0.500" [12.7 mm]; Diameter: 4.937" [125.4 mm]; Length: 8.592" [218.24 mm]; Through bore: 0.750" [19.05 mm]; Min. torque: 20.3 ft-lbs [27.52 Nm]
• GP-540 — Connection: 3/4"-14 NPT (also G3/4" BSPP); Passage size: 0.750" [19.05 mm]; Diameter: 5.250" [133.35 mm]; Length: 9.730" [247.14 mm]; Through bore: None; Min. torque: 20.3 ft-lbs [27.52 Nm]
• GP-641 — Connection: 1"-11.5 NPT (also G1" BSPP); Passage size: 1.000" [25.4 mm]; Diameter: 7.187" [182.55 mm]; Length: 12.190" [309.63 mm]; Through bore: 1.000" [25.4 mm]; Min. torque: 40.7 ft-lbs [55.18 Nm]

Available options

• Custom modifications and mounting configurations
• Electrical slip ring integration for combined fluid and electrical/power/signal transfer
• Multiple series variants to match required pressure and speed ratings

Notes

• Water/glycol and coolant media must include rust inhibitors where specified; oil/hydraulic media must be petroleum-based unless otherwise specified
• Operational life and required torque depend on media type, rotational speed and duty cycle; torque to rotate increases with some media and during dry running
• Applications at maximum continuous speed or elevated temperatures may require alternative seal materials and careful series selection

Technical 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]
• Housing Material: Carbon Steel (Black Oxide); stainless steel option available
• Shaft Material: Carbon Steel (Black Oxide); stainless steel option available
• Connection Types: NPT and BSPP (selection varies by model; NPT models may offer O-ring face seal gland option)
• Passage Count: 4 independent passages
• Suitable Media: Air/Gas, Coolant, Oil/Hydraulic, Water/Glycol (with inhibitors), Chemical (select series), DI/Tap Water (select series), Food-Grade (select series)
• Integrates with standard electrical slip rings for combined fluid and electrical transfer