The OTS™ (Over-The-Shaft) rotary union is custom-designed for machinery that requires cooling on the drive side of driven rolls and for rolls that cannot accept an axially-mounted rotary union. This rotary union is available with a tungsten-carbide mechanical seal or DuraSeal™ technology.

The mechanical seal version of the OTS union is intended for high speed applications up to 750 RPM. The precision ball bearings are widely spaced while the springs are located external to the flow area.

The soft seal version of the OTS union, designed for slower speed applications, uses a DuraSeal design and thrust washer. This seal package has been proven in thousands of process applications since 1991.

Both versions are constructed with stainless steel and bronze components. In addition to water cooling applications, the OTS rotary union can be applied to hydraulic oil and air applications. It is rated up to 220°F, 150 psig, and 750 RPM.

Kadant Johnson Inc. is a leading provider of rotary joints, precision unions, and fluid handling systems to process industries, where they optimize heat transfer in rotating cylinders and integrate fluid handling systems.