FPS-SCE1
The Pre-action system is a combined fire protection (FP) 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 acoustic alarm are connected.
In single-interlock pre-action systems, such as the FPS-SCE1 described, full system activation depends on the occurrence of a single fire-related event caused by heat, detected by electric fire detection sensors:
When one or more electric detectors are triggered, they send an electrical signal to the main control board, constituting the actuation event. Only when this actuation 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 low air pressure switch is used for supervisory purposes only.
The FPS-SCE1 system can reduce the upstream pressure to a preset downstream pressure and maintaining it at a steady level. The pressure-reducing pilot responds to any downstream pressure changes caused by variations in consumption flow rate and keeps the set pressure stable.
