Which component’s purpose is to provide support for hydraulic operations without pressure loss?

The correct answer focuses on the hydraulic swivel, which is essential for allowing the movement and rotation of hydraulic lines without causing fluid pressure loss. This component is designed to facilitate the connection of hydraulic systems, enabling the hydraulic lines to rotate freely while maintaining a constant flow of hydraulic fluid. The design of the hydraulic swivel helps to prevent leakage, ensuring that the hydraulic system operates efficiently and effectively.

In contrast, the relief valve is primarily intended to protect the system from excessive pressure by directing fluid away when necessary. The priority valve manages the flow of fluid to different parts of the system, ensuring that certain functions receive fluid priority, but it does not specifically address the aspect of pressure maintenance during rotary motion. O-ring seals are components used to prevent leaks in hydraulic systems, but they do not provide support for hydraulic operations in terms of rotation or maintaining flow under pressure.