What device is used to prevent further hydraulic fluid loss, if any?

• A. Hydraulic fuse
• B. Check valve
• C. Pressure relief valve
• D. Reservoir cap

Answer: (A)

When a hydraulic line ruptures, the immediate goal is to stop further fluid from leaking out. The device designed for this scenario is the hydraulic fuse. It is placed in the hydraulic line so that normal flow remains possible, but if a sudden, large leak would cause a rapid drop in downstream pressure, the fuse activates and seals the line. This immediate shut-off prevents continued loss of hydraulic fluid, helping to maintain system pressure and reserve fluid for safe operation.

A check valve prevents backward flow but won’t stop a forward leak from a rupture. A pressure relief valve is about protecting the system from overpressure, not stopping a leak. A reservoir cap merely seals the reservoir and doesn’t address fluid loss in the hydraulic circuit.