In a deluge sprinkler system, what triggers the opening of the water valve?

In a deluge sprinkler system, the opening of the water valve is typically triggered by a fire detection system in the vicinity of the sprinklers. This design is crucial because deluge systems are specifically engineered for high-hazard environments where rapid fire growth is a concern. When the fire detection system identifies smoke, heat, or flames, it activates the water valve, allowing the water to flow through all open sprinklers in the system simultaneously.

This approach allows for immediate water coverage over a larger area, effectively combating rapidly extending fires. It is essential for the system to respond automatically to a fire detection signal rather than relying solely on manual intervention or general alarm signals, which may not provide the same instant response required in critical situations. Routine maintenance inspections, while important for ensuring the functionality of the system, do not trigger the water valve but instead serve to assess and maintain the system's readiness for emergency conditions.