Water System
Water is the most widely used extinguishing agent because of its low cost and ready availability, relative to other liquids. However quite aside from cost and availability, water is superior to any other known liquid for fighting the majority of fires. The two most common means of applying water are by a solid stream or spray from a hose and spray from automatic sprinklers.
Dry Pipe Valve
Dry Pipe Valves are differential valves used to automatically control
the flow of water into dry pipe fire protection sprinkler systems upon
operation of one or more automatic sprinklers.
Dry pipe sprinkler systems are used in unheated warehouses,
parking garages, store windows, attic spaces, loading docks, and
other areas exposed to freezing temperatures, where water filled
pipe cannot be utilized.