FPS-SIE0
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 single-interlock pre-action systems, such as the FPS-SIE0 described here, full system activation depends on the occurrence of a single, independent fire-related event - specifically, heat exposure detected by electric sensors.
When one or more electric detectors are triggered, they send a signal to the main control board, initiating the actuation event. Only after this event occurs does the control board energize the solenoid valve, thereby opening the FDV deluge valve and allowing water to flow into the sprinkler pipeline.
The trim is equipped with a PSA - an integrated device that enables local system reset, i.e., re-closing the FDV valve by re-pressurizing its control chamber.
Additionally, the PSA functions as a latching device, keeping the valve open even in the event of a power outage.
