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A Compact Solution For Automatic Capping

Case Study

Diving For a Solution and Delivering


A customer needed a rotary union solution to fit within tight constraints of a recently developed submersible vessel designated to remove heavy barnacle build-up from the underwater surfaces of ships and offshore platforms reaching 300 feet deep. The rotary union needed to deliver up to 3000 PSI of hydraulic flow to power the drive motor, provide a passage to allow for case drainage and allow electrical wiring to pass through it.


By collaborating with the customer’s designers, the SRS team designed a 3-passage, center through-bore rotary union constructed of 316 stainless steel, capable of handling the high working pressures and harsh environmental conditions. The rotary union is a key component in the steering linkage that directs or steers the submerged all-wheel drive vessel about the ship or platform. A series of sensors send vehicle data through the center of the shaft back up to the operating ship’s deck.


SRS provided a solution that met all of the customer’s exact requirements. The new water jet technology project launched its first trials off the coast of Southeast Africa near Madagascar.


  • Eliminates hoses from twisting and flexing as the steering gear rotates, thus improving the life of those interconnects.
  • The shaft protects the wires and serves as the base for the rotary encoder transmitting steering angles.
  • SRS's experience, flexibility and capability to work with the customer's engineering team to develop a custom solution and adapt it to better meet their needs.

About SRS

Scott Rotary Seals (SRS) designs and manufactures custom and off-the-shelf fluid rotary timing valve and rotary union products for a wide range of industrial applications. SRS's fluid sealing products provide reliable transfer of liquids and/or gases from stationary supply lines to rotating equipment.

For more information about SRS, please visit

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