A closed head sprinkler system where water does not enter the system until a detection event triggers the pre-action valve, at which point the head still needs to trip in order to activate the entire system.
A Champion pre-action sprinkler system is similar to a deluge sprinkler system except the sprinkler heads are closed. This type system is typically used in areas containing high value equipment or contents and spaces which are highly sensitive to the effects of accidental sprinkler water discharge.
The pre-action valve holds back water from entering the system until it is tripped by a separate electronic detection system. Activation of a heat or smoke detector in that separate system will open the pre-action valve, allowing water to enter the system piping. Because the sprinkler heads are closed, water will not flow from the sprinklers until heat activates the operating element in individual sprinkler heads. Basically, the automatic opening of the pre-action valve effectively converts the system to a wet pipe sprinkler system.
In a pre-action system the piping is pressurized with air or nitrogen, monitoring of this air pressure provides a means of supervising the system piping. Loss of the supervisory air pressure in the system piping results in a trouble signal at the alarm panel. A pre-alarm of a possible fire allows time for alternate fire extinguishment prior to a sprinkler discharge. In the event the fire cannot otherwise be extinguished, the preaction sprinkler system will then perform as the primary fire protection system. They are designed for applications such as refrigerated areas that require maximum protection against inadvertent operation of the sprinkler system.
- Flammable Liquid Handling
- Storage Areas for Valuable Artifacts
- Aircraft Hangars
- High-Hazard Installations Using Water as Extinguishing Agent
- Computer Rooms
- Refrigerated Spaces