Rotary Unions GPS Series

GPS Series 3-Passage Rotary Unions & Joints

GPS Series 3-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
*Some applications using Chemical media may require alternative sealing materials. Applications above 220° F (105° C) require alternative seal materials. Please consult with DSTI for approval.

The 3-passage, GPS Series rotary unions feature specialized sealing technology suitable for vacuum and bidirectional pressures and three independent flow passages capable of transferring different media types simultaneously.

The stainless steel construction is suitable for hydraulic, pneumatic, coolant, water, and other corrosive media types. Carbon steel models are available for applications that do not require water or corrosive media transfer (see GP Series).

GPS 3-passage models with NPT thread connections consist of a unique shaft configuration for easier installation, allowing the choice of mounting the shaft connections using the threaded passages or O-ring face seal glands for flush mounting the union to an interface. GPS 3-passage models with BSPP thread connections are not available with O-ring face seal glands.

Need to combine fluid with electrical power, signal and/or data transfer? No problem. The GPS 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
GPS-130 [GPSM-130]1/8"-27 NPT [G1/8"-28 BSPP]0.156" [3.962 mm]2.687" [68.25 mm]4.147" [105.334 mm]None1.5 ft-lbs [2.03 Nm] Buy Now
GPS-131 [GPSM-131]1/8"-27 NPT [G1/8"-28 BSPP]0.156" [3.962 mm]2.937" [74.6 mm]4.186" [106.325 mm]0.500" [12.7 mm]2.6 ft-lbs [3.53 Nm] Buy Now
GPS-230 [GPSM-230]1/4"-18 NPT [G1/4"-19 BSPP]0.250" [6.35 mm]3.187" [80.95 mm]5.290" [134.366 mm]None5.3 ft-lbs [7.19 Nm] Buy Now
GPS-231 [GPSM-231]1/4"-18 NPT [G1/4"-19 BSPP]0.250" [6.35 mm]3.750" [95.25 mm]5.601" [142.266 mm]0.750" [19.05 mm]7.6 ft-lbs [10.3 Nm] Buy Now
GPS-330 [GPSM-330]3/8"-18 NPT [G3/8"-19 BSPP]0.375" [9.525 mm]3.875" [98.425 mm]6.030" [153.162 mm]None7.6 ft-lbs [10.3 Nm] Buy Now
GPS-331 [GPSM-331]3/8"-18 NPT [G3/8"-19 BSPP]0.375" [9.525 mm]4.187" [106.35 mm]6.342" [161.087 mm]0.750" [19.05 mm]9.5 ft-lbs [12.88 Nm] Buy Now
GPS-430 [GPSM-430]1/2"-14 NPT [G1/2"-14 BSPP]0.500" [12.7 mm]4.250" [107.95 mm]7.061" [179.35 mm]None9.5 ft-lbs [12.88 Nm] Buy Now
GPS-431 [GPSM-431]1/2"-14 NPT [G1/2"-14 BSPP]0.500" [12.7 mm]4.937" [125.4 mm]7.406" [188.113 mm]0.750" [19.05 mm]16.2 ft-lbs [21.96 Nm] Buy Now
GPS-530 [GPSM-530]3/4"-14 NPT [G3/4"-14 BSPP]0.750" [19.05 mm]5.250" [133.35 mm]8.280" [210.312 mm]None16.2 ft-lbs [21.96 Nm] Buy Now
GPS-630 [GPSM-630]1"-11.5 NPT [G1"-11 BSPP]1.000" [25.4 mm]6.937" [176.2 mm]10.570" [268.479 mm]None24.7 ft-lbs [33.49 Nm] Buy Now

*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, Coolant, DI/Tap Water, Oil/Hydraulic, Water/Glycol
Connection Type NPT, BSPP
GPS Series Rotary Unions - Housing Material
Housing: Material (Plating/Coating) Stainless Steel
GPS Series Rotary Unions - Shaft Material
Shaft: Material (Plating/Coating) Stainless Steel (TDC)

*Some applications using Chemical media may require alternative sealing materials. Applications above 220° F (105° C) require alternative seal materials. Please consult with DSTI for approval. 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 GPS 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 GPS 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 GPS Series rotary unions.

View Options

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