What device prevents sudden loss of hydraulic fluid pressure in aircraft systems?

The device that prevents sudden loss of hydraulic fluid pressure in aircraft systems is the hydraulic fuse. This safety component plays a crucial role in the hydraulic system by acting as a fail-safe mechanism. If a significant leak occurs, leading to a drop in pressure, the hydraulic fuse will detect this and automatically shut off the fluid flow from that part of the system to prevent complete loss of hydraulic pressure. This allows other parts of the hydraulic system to continue functioning normally, enhancing the safety and reliability of the aircraft's hydraulic operations.

In contrast, while a filter element is essential for removing contaminants from hydraulic fluid, it does not directly manage pressure loss. A selector valve is typically used to direct hydraulic fluid to various systems or components but does not function to contain pressure loss. Similarly, a pressure regulator is designed to maintain a specific pressure level within the system but does not prevent sudden drops in pressure that can occur due to leaks or failures. Thus, the hydraulic fuse is specifically engineered for the critical function of maintaining pressure integrity in the hydraulic system.