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The primary responsibility of a liquid relief valve is to release excess liquid pressure within a system. This valve ensures that if the pressure exceeds a predetermined limit, it will safely open and allow for the escape of excess liquid, thus preventing potential hazards such as equipment failure, leaks, or even explosions that could occur due to overpressure conditions.

In the context of fluid handling systems, maintaining proper pressure levels is crucial for safe operation. Liquid relief valves play a vital role in this safety mechanism, as they are specifically designed to respond to pressurization of liquids and provide a reliable avenue for pressure relief, ensuring that systems operate within their designed parameters. Keeping pressure in check prolongs equipment life and enhances safety protocols in industrial settings.

The other options do not pertain to the function of a liquid relief valve. Filling the tank with liquid, managing vapor release, and providing temperature readings are managed by different types of equipment or systems that serve specific purposes within a facility. Liquid relief valves focus solely on pressure management.