How wet alarm valve work?

A wet alarm valve is a critical component in a fire protection system, typically found in wet pipe sprinkler systems. It operates by detecting water flow through the system; when a sprinkler head activates, water flows into the valve chamber, causing the valve to open. This action triggers an alarm to alert occupants and fire services, indicating that a sprinkler has been activated and that a fire may be present. The valve is designed to maintain water pressure in the system while allowing for the flow of water when needed.