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Replacement DEUBLIN 7100-855 ROTARY UNION PRODUCT OVERVIEW AND SELECTION GUIDE
The DEUBLIN 7100-855 is a large-bore, flanged, two-passage high-pressure hydraulic rotary union from the DEUBLIN 7100 series. It is designed to transfer hydraulic oil or other media from a stationary supply to rotating equipment under high-pressure conditions.
Parameter | Specification |
|---|---|
Passages | 2 (dual passage design) |
Port Connections | Rotor side: 2 x G 3/4" thread |
Mounting Type | Flange connection, flange diameter 148 mm (tolerance g6/H7) |
Dimensions | Overall length 288 mm, housing diameter 153 mm, rotor diameter 148 mm |
Max. Hydraulic Pressure | 210 bar (3,050 PSI) |
Max. Speed (short-term) | 250 RPM |
Max. Temperature | 115 °C (239 °F) |
Weight | Approx. 28 kg |
Series Characteristics: The 7100 series is a self-supported rotary union design. It typically incorporates hydrostatic and ball bearings, features a vent for controlled leakage, and includes a secondary shaft seal for reliable operation.
Typical Applications: Given its high-pressure rating, dual-passage design, and large bore, this union is primarily used in heavy machinery or hydraulic systems that require high-flow transmission of hydraulic oil or other media. Inferred from the series context, it may also find applications in specific industrial sectors like wind turbine pitch control systems .
Pressure and Speed Trade-off: It is critical to note that the maximum operating pressure and maximum speed cannot be used simultaneously . Selection should balance these parameters based on actual working conditions.
Verify Interfaces: The flange mount (148 mm) and thread sizes (G 3/4" rotor, G 1/2" housing) are specific. For replacement or new installations, confirm physical compatibility with your equipment .
Series Comparison: The 7100 series includes various mounting styles and sizes. For instance, 7100-853 and 7100-854 are smaller flange models (Ø86 mm and Ø108 mm), while 7100-711, 7100-713, and 7100-777 are threaded connection models. The 7100-855 is among the largest in the series with the highest flow capacity .
Media and Maintenance: The union is designed for hydraulic oil. To ensure seal integrity and longevity, oil cleanliness should meet ISO 4406 Class 17/15/12 standards . For installation, it is recommended to use flexible hoses rather than rigid piping to reduce external stress on the union.
