Rotary Unions GP Series

GP Series 2-Passage Rotary Unions & Joints

GP Series 2-Passage Rotary Unions & Joints
Maximum Pressure See Other Pressure Options
Maximum Speed See Other Speed Options
Connection Type See Other Connection Options
Suitable Media* See Other Media Options
*Stainless steel (housing/shaft) material option is recommended for all liquid media applications.

DSTI 2-passage GP Series rotary unions feature specialized seals suitable for vacuum and bidirectional pressures up to 7,500 PSI [515 BAR] and two independent flow passages.

GP 2-passage models consist of a specialized shaft configuration for easier installation allowing the choice of mounting the shaft connections using the female tapped passages or O-ring glands for face/flush mounting.

Need to combine fluid with electrical power, signal and/or data transfer? No problem. The GP Series rotary unions are designed to integrate directly with our standard electrical slip rings. See options.

Available Configurations

Part # Connection Passage Size Diameter Length Through Bore Min. Torque* Part Downloads Information
GP-120 [GPM-120]1/8"-27 NPT [G1/8"-28 BSPP]0.156" [3.962 mm]2.437" [61.9 mm]3.347" [85.014 mm]None0.5 ft-lbs [0.68 Nm] Get Quote
GP-121 [GPM-121]1/8"-27 NPT [G1/8"-28 BSPP]0.156" [3.962 mm]2.937" [74.6 mm]3.637" [92.38 mm]0.500" [12.7 mm]1.9 ft-lbs [2.58 Nm] Get Quote
GP-220 [GPM-220]1/4"-18 NPT [G1/4"-19 BSPP]0.250" [6.35 mm]2.937" [74.6 mm]4.374" [111.1 mm]None3.9 ft-lbs [5.29 Nm] Get Quote
GP-221 [GPM-221]1/4"-18 NPT [G1/4"-19 BSPP]0.250" [6.35 mm]3.750" [95.25 mm]4.773" [121.234 mm]0.750" [19.05 mm]5.7 ft-lbs [7.73 Nm] Get Quote
GP-320 [GPM-320]3/8"-18 NPT [G3/8"-19 BSPP]0.375" [9.525 mm]3.187" [80.95 mm]4.706" [119.533 mm]None4 ft-lbs [5.42 Nm] Get Quote
GP-321 [GPM-321]3/8"-18 NPT [G3/8"-19 BSPP]0.375" [9.525 mm]4.187" [106.35 mm]5.312" [134.925 mm]0.750" [19.05 mm]7.1 ft-lbs [9.63 Nm] Get Quote
GP-420 [GPM-420]1/2"-14 NPT [G1/2"-14 BSPP]0.500" [12.7 mm]3.875" [98.425 mm]5.392" [136.957 mm]None5.7 ft-lbs [7.73 Nm] Get Quote
GP-421 [GPM-421]1/2"-14 NPT [G1/2"-14 BSPP]0.500" [12.7 mm]4.937" [125.4 mm]6.220" [157.988 mm]0.750" [19.05 mm]12.2 ft-lbs [16.54 Nm] Get Quote
GP-621 [GPM-621]1"-11.5 NPT [G1"-11 BSPP]1.000" [25.4 mm]7.187" [182.55 mm]8.600" [218.44 mm]1.000" [25.4 mm]24.4 ft-lbs [33.08 Nm] Get Quote

*Minimum torque required to rotate based on zero pressure.

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]
Suitable Media* Air/Gas, Chemical, DI/Tap Water, Oil, Water/Glycol
Connection Type NPT, BSPP
GP Series Rotary Unions - Housing Material
Housing: Material (Plating/Coating) Carbon Steel (Black Oxide) or Stainless Steel
GP Series Rotary Unions - Shaft Material
Shaft: Material (Plating/Coating) Carbon Steel (Black Oxide) or Stainless Steel (TDC)

*Stainless steel (housing/shaft) material option is recommended for all liquid media applications. All values listed under Technical Specifications are dependent on a combination of all application parameters. Please note operational life is dependent upon both rotational speed and duty cycle. Contact DSTI if your application requires operating close to the maximum rotational speed with a continuous duty cycle. Applications with temperatures above 220° F (105° C) require alternative seal materials. Please consult with DSTI regarding your specific application requirements.

Available Options

Available Custom Modifications for GP Series Rotary Unions

Custom Modifications

Easier and less expensive than you may think. We can modify our standard products to fit your project requirements.

Learn More
Electrical Slip Rings for GP Series Rotary Unions

Electrical Slip Ring Integration

Get the complete package. We offer a wide range of electrical slip rings designed to directly integrate with our GP Series rotary unions.

View Options


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