Type of Sprinkler System
Wet valve sprinkler systems are permanently charged with water and used to protect premises where temperatures are unlikely to fall below freezing point. They are designed to actuate operate electric, and/or hydraulic alarms when there is a steady flow of water into the system that is equivalent to the discharge rate of one or more sprinklers. The size of the valve, its flow rate and the system water supply pressure and air pressure are all determined by the size and type of fire risk involved
Dry valve sprinkler systems are permanently charged with air and used to protect unheated premises such as warehouses, hangars, attic spaces and other areas exposed to freezing temperatures. When the system is set is charged with air, the minimum air pressure includes a safety factor to prevent potential main water pressure in stabilities from forcing the Dry valve clack open to allow water into the system pipework.