Which safety relief valve can be reused after relieving pressure?

A spring-loaded device is designed to automatically open to relieve pressure when it exceeds a preset limit, and it can return to a sealed state once the pressure is reduced to a safe level. This characteristic allows the valve to be reused multiple times without needing replacement or extensive repair.

In contrast, a frangible disk is designed to rupture at a specific pressure, rendering it unusable after it has activated. Similarly, a fusible plug melts and releases gas when a specific temperature is reached, making it a single-use safety feature. A pressure release valve serves a similar purpose but might have specific criteria or limitations based on design that dictate whether it can be reused.

Thus, the ability of a spring-loaded device to reset and function again after relieving pressure positions it as the reusable safety relief valve among the options provided.