- + All Rotary Unions
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- + SCS Series
- + HVH Series
- + Series Comparison Chart
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Rotary Unions are also referred to as:
- Rotating Unions
- Rotating Joints
- Rotating Couplings
- Rotating Swivels
- Hydraulic Swivels
- Rotary Joints
- Rotary Couplings
- Hydraulic Couplings
- Rotary Swivels
- Swivel Joints
- Fluid Swivels
- Swivel Unions
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(S) 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.
| part # | # of passages | thru bore | overall diameter | overall length | min torque* | passage size | slip ring option | link |
|---|---|---|---|---|---|---|---|---|
| HVH-3531 | 3 | 0.750 | 6.438 | 9.550 | 50 | 0.750 | View | |
| HVH-3631 | 3 | 0.750 | 6.438 | 10.303 | 50 | 0.875 | View | |
| HVH-3731 | 3 | 0.750 | 7.438 | 11.370 | 150 | 1.250 | View | |
| HVH-3831 | 3 | 0.750 | 8.938 | 12.293 | 150 | 1.500 | View | |
| HVH-3541 | 4 | 0.750 | 6.438 | 11.283 | 50 | 0.750 | View | |
| HVH-3641 | 4 | 0.750 | 6.438 | 12.283 | 50 | 0.875 | View | |
| HVH-3741 | 4 | 0.750 | 7.438 | 13.664 | 150 | 1.250 | View | |
| HVH-3841 | 4 | 0.750 | 8.938 | 14.878 | 150 | 1.500 | View | |
| HVH-3561 | 6 | 1.000 | 6.938 | 14.743 | 100 | 0.750 | View | |
| HVH-3661 | 6 | 1.000 | 7.438 | 16.243 | 150 | 0.875 | View | |
| HVH-3761 | 6 | 1.000 | 8.938 | 18.652 | 150 | 1.250 | View | |
| HVH-3861 | 6 | 1.000 | 10.938 | 20.104 | 200 | 1.500 | View | |
| HVH-3581 | 8 | 1.000 | 8.938 | 18.828 | 150 | 0.750 | View | |
| HVH-3681 | 8 | 1.000 | 8.938 | 20.859 | 150 | 0.875 | View | |
| HVH-3781 | 8 | 1.000 | 12.375 | 23.340 | 250 | 1.250 | View | |
| HVH-3881 | 8 | 1.000 | 12.375 | 25.276 | 250 | 1.500 | View |
All dimensions are shown in inches.
*This is the minimum torque required to rotate based on zero pressure measured in foot-pounds
| Max. Pressure¹ | 5000 PSI (345 BAR) |
| Max. Vacuum¹ | 30 HG |
| Max. Rotational Speed¹ | up to 50 RPM |
| Max. Temperature¹ | 350° F (176° C)² |
¹Values are dependent on application parameters. Please consult with DSTI.
²High temperature applications may require alternative seal materials. Please consult with DSTI.
| Connection Sizes | .75", .875", 1.250", 1.500". Other sizes available upon request. |
| Connection Type | SAE threads standard. BSPP and other thread options are available. |
| Plating and Coatings | Nitride plating is standard. Anodized, E-Nickel, Chrome, Ceramic and other specialty platings are available. |
| Materials | Alloy steel is the standard material for the HVH Series. Stainless Steel, Aluminum, Brass, and other materials are available on a custom basis. |
| Mounting Options | The 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 Options | The 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. |
