FPS-SCE0
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 keeps 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 both the water pressure switch and the acoustic alarm are connected.
In single-interlock pre-action systems, such as the FPS-SCE0 described here, full system activation depends on the occurrence of a single independent, fire-related event detected by fire detection electric sensors:
When one or more electric detectors are triggered, they send an electrical signal to the main control board. This constitutes the actuation event. Consequently, the control board energizes the solenoid valve, opening the FDV deluge valve and allowing water to flow into the sprinkler pipeline. The low air pressure switch is used for supervision only
Fire suppression is activated only when one or more sprinklers open due to heat. Water is discharged exclusively through the sprinklers that have opened directly above the fire.
The trim is equipped with a PSA — a device that enables a local system’s reset, i.e., reclosing the FDV valve by re-pressurizing its control chamber. The PSA is considered a latching device that keeps the valve open even in the event of a power outage.
The FPS-SCE0 system is also capable of reducing upstream pressure to a predetermined downstream pressure and maintaining it at a steady level. The pressure-reducing pilot responds to any downstream pressure changes caused by flow rate variations, ensuring a stable set pressure.
