Rotary Union Products


Electrical Slip Ring Products


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  • Our rotary union products provide options for both single and multiple passage designs capable of handling different media types simultaneously.

  • From our standard rotary union products to our custom designed solutions, our engineers will help you find a solution that meets your exact specifications.

HVH Series Rotary Union

The HVH Series rotary unions are available in 3, 4, 6 & 8 passage models. Modified or specialized configurations are also available. HVH Series rotary unions offer larger flow passages and increased flow volume than the GP Series. HVH Series rotary unions are suitable for vacuum & bidirectional pressures up to 5000 PSI and feature a protected ball bearing design suitable for harsh / outdoor environments.

All HVH Series rotary unions feature heavy-duty alloy steel construction with corrosion resistant nitride surface treatment and are available with electrical slip ring options for power/data transfer.

HVH 3 Passage Rotary Union

3 Passage

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HVH 4 Passage Rotary Union

4 Passage

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HVH 6 Passage Rotary Union

6 Passage

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HVH 8 Passage Rotary Union

8 Passage

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part # thru bore overall diameter overall length min torque* passage size slip ring option
HVH-35310.7506.4389.550500.750View Model
HVH-36310.7506.43810.303500.875View Model
HVH-37310.7507.43811.3701501.250View Model
HVH-38310.7508.93812.2931501.500View Model
HVH-35410.7506.43811.283500.750View Model
HVH-36410.7506.43812.283500.875View Model
HVH-37410.7507.43813.6641501.250View Model
HVH-38410.7508.93814.8781501.500View Model
HVH-35611.0006.93814.7431000.750View Model
HVH-36611.0007.43816.2431500.875View Model
HVH-37611.0008.93818.6521501.250View Model
HVH-38611.00010.93820.1042001.500View Model
HVH-35811.0008.93818.8281500.750View Model
HVH-36811.0008.93820.8591500.875View Model
HVH-37811.00012.37523.3402501.250View Model
HVH-38811.00012.37525.2762501.500View Model

All dimensions are shown in inches. Click here to convert to Metric

*This is the minimum torque required to rotate based on zero pressure measured in foot-pounds


Standard electrical slip ring options available.

Max. Pressure¹5000 PSI (345 BAR)
Max. Vacuum¹30 HG
Max. Rotational Speed¹up to 50 RPM
Temperature Range¹0° F to 220° F (-18° C to 105° C)²

¹Values are dependent on a combination of all application parameters. Please consult with DSTI.

²Applications with temperatures above 220° F (105° C) require alternative seal materials. Please consult with DSTI.

Connection Sizes.75", .875", 1.250", 1.500". Other sizes available upon request.
Connection TypeSAE threads standard. BSPP and other thread options are available.
Plating and CoatingsNitride plating is standard. Anodized, E-Nickel, Chrome, Ceramic and other specialty platings are available as custom options.
MaterialsAlloy steel is the standard material for the HVH Series. Stainless Steel, Aluminum, Brass, and other materials are available on a custom basis.
Mounting OptionsThe HVH series unions have individual female SAE passages standard. There are also tapped holes on the end of the housing & bolt slots on the shaft flange for mounting the assembly.
Slip Ring OptionsThe HVH Series unions are available with a number of RotaRing™ slip ring options for power, signal and data transfer. The assembly is available with an aluminum cover to protect the slip ring during use in demanding environments.
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