In dry standpipe systems connected through a dry-pipe or deluge valve, how is water released?

In dry standpipe systems connected through a dry-pipe or deluge valve, water is released by opening an outlet valve or tripping a switch. This is because dry standpipe systems are designed to remain empty of water until they are needed during a fire or emergency situation. When firefighters or trained personnel engage the system, they either open an outlet valve directly or activate a switch, which then allows the water stored in the pressurized pipe system to flow through the standpipe and reach the desired outlet for firefighting efforts.

By focusing on user engagement with the outlet valve or switch, this method ensures that the water is not released unintentionally and only flows when required for effective firefighting operations. In this way, the system can be effectively managed according to the needs of the situation at hand.