What device is specifically designed to use gravity to remove water from piping or valve cavities?

The automatic drain valve is specifically designed to use gravity to remove water from piping or valve cavities. It operates by allowing water to drain out of a system when it is not under pressure, effectively utilizing gravity to facilitate the removal of residual water. This is particularly important in fire protection systems to prevent freezing, corrosion, or other damage that can occur when water is left in the system. Automatic drain valves usually include mechanisms that open when the system is not pressurized, ensuring that any trapped water can escape and maintaining the integrity of the fire protection system.