What Kind of Seals are in a Hydraulic Swivel? And What Do They Do?

Posted on Tuesday, December 6, 2016 in UEA Blog


In order to construct a properly functioning hydraulic swivel, many types of seals must be used. Each seal performs a specified function to ensure the hydraulic swivel operates correctly. At UEA, our seal kit consists of: o-rings, thrust washers, excluder seals, u-cup seals, wear rings, energizers and cap seals.

The o-rings keep the large particulate from getting into the swivel.  The excluder seals are located at the ends and are internal to the swivel and keep the smaller pieces of particulate out. Inside of the excluder is the u-cup which prevents the hydraulic fluid from escaping from the swivel.

Next, the wear rings act as the bearing material and maintain the e-gap between the spool and housing during its operation. The energizer and cap seal are located between each circuit and contain the hydraulic oil within each circuit. We like the circuits at each end of the swivel to be low pressure, with one being a return back to the tank. When a high pressure circuit is needed, a weep circuit is added adjacent to it and is connected to the back of the tank circuit.

The position of the torque arm is located within close proximity to the mounting flange in order to provide smooth rotation during its operation.

If you are interested in learning more about hydraulic swivel seals, check out our blog, How Long do Hydraulic Swivels Last?

Thomas Van Veldhuizen
Designer

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