Which kinds of torque is better for rotary unions? Low torque or High torque?

For the torque of rotary unions, it is hard to say low torque or high torque is better for rotary unions. As the torque for rotary unions depends on several factors and the specific requirements of the application. Here's a breakdown of considerations for both low and high torque:

Low Torque:

Reduced Wear: Lower torque typically means less friction between components, which can lead to reduced wear and longer lifespan for seals and bearings.

Energy Efficiency: Lower torque generally translates to lower energy consumption, which can be beneficial for efficiency and operating costs.

Smooth Operation: Lower torque can contribute to smoother operation of the rotary union, reducing vibrations and potential noise.

High Torque:

Power Transmission: In applications where the rotary union is used for power transmission, a higher torque may be necessary to ensure efficient power transfer.

Handling High Loads: Some applications may require rotary unions to handle high pressure or flow rates, which can necessitate higher torque to overcome resistance.

Compatibility with Drive Systems: If the rotary union is integrated with other mechanical systems that require higher torque, matching torque levels may be necessary for compatibility.

Therefore, the ideal torque for a rotary union depends on balancing these factors to meet the specific requirements of the application while optimizing performance, reliability, and efficiency. It's essential to carefully consider factors such as operating conditions, media properties, and system constraints when determining the appropriate torque for a rotary union in a given application.