What allows fluid to flow back into a hydraulic reservoir from the system?

The return line is a vital component in hydraulic systems that facilitates the flow of fluid back into the hydraulic reservoir. It operates by providing a pathway through which hydraulic fluid can flow after it has performed its duty in the system, such as moving a cylinder or motor.

When the hydraulic system is at work, the fluid is pressurized and must return to the reservoir to maintain system integrity and prevent overheating or fluid contamination. The return line ensures this fluid can move back to the reservoir efficiently, thus assisting in circulation and readying the system for the next cycle of operation.

In contrast, other components like the pressure relief valve are designed to protect the system from overpressure by allowing excess fluid to escape but do not specifically function to facilitate return flow. The filter is crucial for ensuring the cleanliness of the fluid but does not influence the direction of flow. The non-return valve typically prevents backflow from the reservoir to the system and is used in applications where fluid must flow in one direction only. Therefore, the return line uniquely provides the necessary function of guiding fluid back to the reservoir.