Case Study: Customized Seal Load/Friction in a Torque Sensitive Rotary Union A classic example of where a rotary union can be found is in large hydraulic excavators or backhoes. The union permits hydraulic fluid to be transferred to the track drive system while allowing the cab and excavator arm to pivot 360° about the base. A more modern application is in large, electricity-generating wind turbines. A rotary union allows hydraulic fluid to pass from the stationary base into the spinning blade pitch control mechanism. The pitch of the blade can be optimized for all wind conditions while in constant motion. Other industries, including aerospace, semi-conductor, and medical, require smaller, more precise units to transfer gases or cooling fluids. As automation in these sectors becomes more p

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