Rotary Unions HVH Series

HVH Series 3-Passage Rotary Unions & Joints

HVH 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

DSTI 3-passage, high-flow HVH Series rotary unions are suitable for vacuum & bidirectional pressures up to 5000 PSI [345 BAR] and feature three independent flow passages.

HVH 3-passage models consist of a heavy-duty alloy steel construction and protected ball bearings ideal for harsh, rugged outdoor applications such as heavy forestry and construction equipment.

Need to combine fluid with electrical power, signal and/or data transfer? No problem. The HVH 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
HVH-3531 [HVHM-3531]#12 SAE [G3/4"-14 BSPP]0.750" [19.05 mm]6.438" [163.526 mm]9.550" [242.57 mm]0.750" [19.05 mm]50 ft-lbs [67.79 Nm] Get Quote
HVH-3631 [HVHM-3631]#16 SAE [G1"-11 BSPP]0.875" [22.225 mm]6.438" [163.526 mm]10.303" [261.697 mm]0.750" [19.05 mm]50 ft-lbs [67.79 Nm] Get Quote
HVH-3731 [HVHM-3731]#20 SAE [G1-1/4"-11 BSPP]1.250" [31.75 mm]7.438" [188.926 mm]11.370" [288.799 mm]0.750" [19.05 mm]150 ft-lbs [203.37 Nm] Get Quote
HVH-3831 [HVHM-3831]#24 SAE [G1-1/2"-11 BSPP]1.500" [38.1 mm]8.938" [227.026 mm]12.293" [312.243 mm]0.750" [19.05 mm]150 ft-lbs [203.37 Nm] Get Quote

*Minimum torque required to rotate based on zero pressure.

Technical Specifications

Maximum Pressure 5,000 PSI [345 BAR]
Maximum Speed 50 RPM
Maximum Vacuum 30 HG
Temperature Range 0° F to 220° F [-18° C to 105° C]
Suitable Media Air/Gas, Oil, Water/Glycol
Connection Type SAE, BSPP
HVH Series Rotary Unions - Housing Material
Housing: Material (Plating/Coating) Alloy Steel (QPQ Nitride)
HVH Series Rotary Unions - Shaft Material
Shaft: Material (Plating/Coating) Alloy Steel (QPQ Nitride)

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 HVH 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 HVH 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 HVH Series rotary unions.

View Options


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