Rotary joints are critical components in fluid transfer systems between stationary lines and rotating equipment. They enable the transfer of water, steam, oil, air, gas, and other media without leakage, ensuring reliability and performance even under demanding operating conditions. Proper selection directly impacts production efficiency, service life, maintenance intervals, and operating costs.   When and Why Is a Rotary Joint Required in Your Machine? Typical functions: • Transfer of fluids for heat exchange (e.g., steam/water in paper machine drying cylinders)• Supply of coolant or MQL to machine tool spindles     What Are the Key Technical Parameters to Consider? Selecting a rotary joint is not determined by