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IOM
Model: FP 400E-5D
Sizes: 2"-12"
PI4PE09-400E-5D
10. Operation
The BERMAD Model 400E–5D is suitable for systems that include wet pilot lines with closed fusible plugs
(thermal releases), and piping systems with a wide variety of open nozzles. The typical wet pilot line is installed in
the covered area and connected to the valve trim. Providing boosted local pressure release from its control
chamber, the Model 400E–5D is recommended for systems with remote and/or elevated pilot line fusible plugs.
In the SET position line pressure, which is supplied to both the main valve’s control chamber [1] and a Hydraulic
Relay Valve (HRV) [2] by the priming line [3], through a Check Valve [4], an Accelerator [5] with priming
restriction and the wet pilot line [6] restriction [7], is trapped by the Check Valve, by the closed HRV, by the
closed wet pilot line and by a closed Manual Emergency Release [8]. The trapped pressure holds the main
valve’s diaphragm and plug against the valve seat [9], sealing it drip tight and keeping the system piping dry. The
HRV is held closed by the pressure in the wet pilot line.
Under FIRE or TEST conditions, a pilot line hydraulic pressure drop opens the HRV causing water to exit through
the Accelerator faster than it can be supplied. Pressure is then released from the main valve’s control chamber
through the opened HRV, or the Manual Emergency Release, allowing the main valve to fully open and water to
flow into the system piping and to the alarm device (if mounted).
11. Manual Operation
Whenever the handle of the Manual Emergency Release (8) is pulled, pressure is released from the top
chamber, the Deluge Valve will open, and water will flow into system piping and alarm devices.
Figure 2: Operation Drawing
12. Maintenance and Inspection Test
Warning: Do not turn off the water supply to make repairs without placing a roving fire patrol in the area covered
by the system. The patrol should continue until the system is back in service.
12.1. Prior to turning off any valves or activating any alarms, notify local security guards and the central alarm
station, if used, so that a false alarm will not be signaled.
12.2. In any of the following inspections or testing procedures, if an abnormal condition exists, see Abnormal
Conditions (§17) for possible cause and corrective action.
12.3. See NFPA Pamphlet No.25.
