What is the differencesw in relief and vent in a hydraulic system?

In a hydraulic system, a relief valve is designed to prevent excessive pressure buildup by diverting fluid back to the reservoir when the pressure exceeds a preset limit. A vent, on the other hand, allows air to enter or escape the hydraulic system, helping to maintain atmospheric pressure and prevent vacuum conditions that can affect system performance. Essentially, relief valves protect against overpressure, while vents ensure proper fluid movement and system integrity.