Types of Preaction
1- single interlock
This only requires activating fire detectors so that the valve opens so that water passes through the pipes of the network and once the sprinklers have worked, the water will come out
2- double interlock
Here, in order for the valve to open, you need to activate two machine guns that open to reduce air pressure and an electric signal from the fire detectors, and when none of them work, the system does not work, i.e. the valve does not open and the water does not pass to the sprinkler network.
3- non interlock
Here when the fire detectors are done, the valve opens and allows water to pass, and if the reagents do not work and only the machine guns work, the system turns to work like a dry system, I mean, it will also open the valve whether the reagents work or not Hi It should be noted that in all previous cases pipes are filled with compressed air or nitrogen and nitrogen is preferred to avoid rust in the grid
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