A wet alarm valve is a one-way valve designed to allow water flow into a wet fire suppression system and activate connected alarm components at specified pressure and flow rates. Together with other components such as pressure switches, water flow indicators, and sprinkler heads, it forms a wet automatic sprinkler system, widely used in fire-prone facilities such as warehouses, hotels, shopping malls, hospitals, theaters and office buildings. It is particularly suitable for high-rise buildings and underground engineering projects.