90 Degree Rotary Union with Bearings

90 Degree Rotary Union with Bearings

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Oct 16, 2025 - 14:54
90 Degree Rotary Union with Bearings
Hydraulic actuactor

A 90-Degree Rotary Union with Bearings is a specialized mechanical device, also known as a swivel joint or rotary coupling, used to reliably transfer fluid (liquid or gas) from a stationary supply line to a continuously rotating piece of machinery, with the inlet and outlet ports set at a $90^\circ$ angle to each other.

Key Features and Function

Bearings are what make this component unique, especially for applications that are demanding.

1. Core Function

Its primary purpose is to maintain a leak-proof seal while facilitating the flow of media--such as hydraulic oil, air, water, or coolants--from a fixed pipe to a part that rotates $360^\circ$ or pivots. The $90^\circ$ elbow design helps manage hose routing, making it highly effective for connecting a flexible hose that runs parallel to the axis of rotation.

2. Design Components

The unit is comprised of four major parts:

  • Housing (Stator): The stationary piece that connects with the line of supply.

  • Shaft (Rotor): The rotating component that is connected with the device.

  • Seals: Essential parts (often Teflon or mechanical seals) to stop media leakage between stationary and moving components.

  • Bearings. They are typically, deep groove ball bearings are used to provide support to the shaft, allowing it to spin smoothly, while taking on heavy loads on the sides and operating at relatively slow speeds. They are vital to ensure stability, while ensuring the shaft is not impacted by excessive rotational force, and also decreasing wear on seals.

3. Performance Capability

Rotary unions that have bearings are designed to withstand heavy-duty usage and are able to handle:

  • HP Most often, as high as 7000 PSI or more in the case of specialized models.

  • Moderate Speeds The bearings are designed to withstand rotational forces without generating excessive heat or vibration.

  • High Side Loads The structure of the bearing can help absorb forces perpendicular to the axis of rotation, which is typical in a variety of industrial applications.

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