FPS-DCE1
The Pre-action system is a fire protection (FP) combined system, consisting of a controlled FDV deluge valve and a riser check valve installed downstream. The pressurized automatic sprinkler pipeline maintains the riser check valve in a closed position. The section between the downstream side of the closed deluge valve and the check valve clapper functions as the “intermediate chamber,” where the water pressure switch and the acoustic alarm are connected.
In double-interlock pre-action systems, such as the FPS-DCE1 described here, full system activation depends on the occurrence of two independent, fire-related events: one caused by heat exposure and the other by fire detection. The activation of the FPS-DCE1 system requires two electrical signals.
In the event of a fire, heat causes one or more automatic sprinklers to open, resulting in a drop in pressure within the sprinkler pipeline. This pressure drop activates the air pressure switch, which sends a signal to the main control board. This constitutes the first actuation event.
When one or more Electric detectors are triggered, they send an electrical signal to the main control board, constituting the second actuation event. Only when both actuation events have occurred does the control board energize the solenoid valve, thereby opening the FDV deluge valve and allowing water to flow into the sprinkler pipeline.
The FPS-DCE1 system is capable to reduce the upstream pressure to a set downstream pressure and maintain it in a steady level. The pressure reducing pilot responses to any downstream pressure changes caused by consumption flow rate changes and keeps a stable set pressure.
