Kidde Fire Protection 400 Series, Руководство по проектированию, установке, эксплуатации и техническому обслуживанию

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Installation
06-237518-001 4-3 July 2018
4-2 SELECTOR VALVE SYSTEM
In selector valve systems, the Agent may be distributed to various hazards from a common
cylinder bank. Only one hazard can be protected at a time. Therefore, it is recommended that
a reserve bank of cylinders is maintained such that continuous fire suppression is available in
the event of a discharge. The number of cylinders released per hazard is controlled by using a
solenoid release unit and non-return valve for each “master” cylinder in the bank (with
exception of the first master cylinder that actuates the entire bank).
Non-return valves in the pilot line prevent the discharge of excess cylinders into enclosures
which do not require the entire content of the cylinder bank. A low-pressure back-plate
manifold incorporating low-pressure 2 way solenoid valves controls the pressure directed to
the selector valves. Each solenoid valve controls a specific selector valve.
Note: The solenoid on the back-plate manifold leading to the hazard being protected by the
discharge must be continuously powered during the system discharge.
The back-plate manifold receives propellant pressure from the discharge manifold. The
propellant pressure is reduced to 8 bar by a pressure-reducing valve.
The fire alarm and control panel will simultaneously energize the high-pressure release
solenoid valve on the master cylinder in the bank and the associated low-pressure solenoid
valve on the backplate manifold for the area where a fire is detected.
For safety reasons, selector valves are supplied as dual action. The selector valves shall be
closed in the normal standby position and only open during a discharge. The selector valve
needs to be closed manually after the discharge and before resetting the system with a new
set of cylinders. The selector valves are not self-resetting.
In Figure 4-2, there are two release units. The Hazard 1 release unit would fire all 6 cylinders.
The Hazard 2 release unit would only fire the 3 cylinders down stream of the pilot line non-
return valve.
Figure 4-2. Typical Pilot Line on Selector Valve System (Rear View)
Table 4-2. Components for Typical Pilot Line
Item Description
1 Hazard 1 Release Unit
2 Hazard 2 Release Unit
3 Pilot Line Non-Return Valve
4 Pilot Line Bleed Valve
5 Manifold Safety Device
6 Manifold Pressure Gauge
To Distribution
Pipe Work
5
6