What happens to the hydraulic system when pressure exceeds the set limit?

When the pressure within the hydraulic system exceeds the predetermined set limit, the relief valve is designed to open as a safety mechanism. This component serves a critical function in maintaining optimal pressure levels within the system. By allowing excess fluid to escape, it prevents overpressure conditions that could lead to potential system failures or damage.

The relief valve essentially acts as a safety valve, ensuring that the hydraulic system remains within its safe operational parameters. This not only protects the integrity of the system but also ensures the reliability of the aircraft's hydraulic functions, which are essential for controlling various systems, including the brakes and landing gear.

Maintaining the correct pressure is vital for the hydraulic system's performance, and the activation of the relief valve is a critical response to safeguard against unsafe pressure levels.