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Hydraulic Swivels

Hydraulic Swivels

Hydraulic Swivels

What is a Hydraulic Swivel?

Swivels, also known as rotary unions, hydraulic swivels, swivel joints, and live swivels are used in applications where a constant transmission of fluid power from a stationary source to a rotating source is required without cross-contamination or leakage. 

Light and heavy-duty applications use swivels to allow for 360-degree rotation while preserving each hydraulic hose from getting tangled with other components in the machine structure. In return, mechanical stresses that would result from hose twisting, bending, and stretching can be relieved, the hose life is enhanced, and machine downtime is avoided.

Swivels are engineered to operate at a wide range of temperature and pressure ratings across a variety of conditions and environments. Based on industry requirements, a swivel is designed to have multiple fluid ports and hose fittings to transfer fluid simultaneously at various rotational speeds. 

Typically, as the number of ports increases, the body size increases, and the speed of a swivel will be lower. Internal ball bearings, seals, and other components preserve a swivel's function to withstand high pressure and temperature range.

No of Ports
2, 3, 4, 5, 6, 8, 9
Port Type
Port Size
1/4, 3/8, 1/2, 3/4, 1
Electrical Passage
Yes, No
Technical Specifications
Suitable for Bidirectional pressure and Vacuum
Horizontal/Vertical Application
Maximum Pressure: 420 Bar
Min/Max operating temperature: -10°C/80°C
Through bore to accommodate electrical slip ring
Anti- corrosion coating to assist usage in harsh environment
RPM range: 10-15
Dual Zurcon wearing support
High pressure leak proof Turcon Roto Glyd Seals

SlewMaster Hydraulic Swivel Features

Features of SlewMaster hydraulic swivels include:

  • Configuration: A hydraulic swivel joint can be a range of sizes and shapes based on application. Regardless of the project, all swivels use a shaft and housing.
  • Material: For high-pressure capabilities, a hydraulic swivel is made from stainless steel or hardened carbon steel.
  • Operation: Swivels act as hose routing mechanisms. Fluid power flows from one hose to another through the swivel's hose connection. When a rotary union operates, the shaft rotates around its stem axis, and the housing remains fixed.
  • Outer design: The housing includes numbered markings, machined passages and grooves to support fluid power transfer. These features prevent pressure drop when hose ends are connected to the swivel fitting.
  • Inner design: Inside a hydraulic swivel, you can find a range of seal options, including snap rings, O-rings, wearings and small ball bearings based on application. Inner components fit into high-tolerance machined grooves to push fluid. 


The Benefits of a SlewMaster Hydraulic Swivel Fitting

When users apply the recommended design and operation requirements, hydraulic swivels offer long life spans with minimal machine downtime.

A rotary union or hydraulic swivel offers many benefits for machines. These components:

  • Accommodate a wide range of operating pressures.
  • Allow many custom modifications.
  • Support smooth, leakproof fluid flow.
  • Work with minimal friction.


Applications for a Hydraulic Swivel Joint

At SlewMaster, our technicians will work closely with your team to understand your project needs. With the information we gather, we can design a hydraulic swivel that accommodates your flow rate, speed and pressure requirements.

Swivels are used in many industries where applications require 360-degree rotation of equipment with. Occasionally, a swivel will complement a slew ring or slew drive. Possible applications for these components include:

  • With slew rings on vacuum trucks and cranes.
  • Bottling lines.
  • Herd feeding equipment.
  • Waste recycling machines.
  • Hydraulic excavators.
  • Welding and robotic arms.
  • Offshore hose reels.
  • Wind turbines.


How to Choose a Hydraulic Swivel?

The most common material used to manufacture swivels is carbon-steel, while stainless steel is also an option. Significant design and space considerations must be given for swivels and their fittings. Based on application requirements, swivels may have up to 9 different fluid ports with hose fittings. 

Although subject to axial and side loads, swivels operate under high internal pressure as a direct result of fluid power within. The service life of swivels is heavily dependent on its pressure rating and user handling. When selecting a swivel, a user must identify the following:

  • Number of fittings
  • Hoses
  • Operating speed
  • Temperature
  • Pressure rating
  • Fluid power
  • Fluid specifications
  • Maximum allowable pressure drop
  • Axial and side loading values
  • Hose fittings size
  • Material


Contact SlewMaster for Custom & In-Stock Hydraulic Swivels

With the project specifications you provide, SlewMaster can offer the best solutions that suit you application. In most cases, our standard in-stock swivels can be modified to fit into your application, and if required, our team can provide custom-built swivels that suit your needs. 

Further, Slewmaster can also cross-reference other manufacturers' swivels and provide equivalent solutions. Rebuild and swivel seal replacement kits are available upon request to avoid any operating downtime. Contact us today for your hydraulic swivel fitting needs!


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