SA Fire Protection double chamber deluge valve Mod VDD from DoseTech
The SA Fire Protection double chamber deluge valves Mod VDD available from DoseTech are diaphragm type valves available in diameter sizes from 3” (DN 80) to 8” (DN 200). The two priming chambers, each one provided with its own diaphragm and control trim, provide fully redundancy improving the safety availability of the system. The double chamber deluge valves VDD are used to control water flow in deluge, preaction, pressure regulating and on/off fire protection systems. With the proper additional accessories installed (pressure switch, water motor alarm), they are able to provide actuation of fire alarms upon system operation.
In normal operating conditions the valve is held closed by the water pressure in the two priming chambers. In fire conditions water is released from the priming chambers through the release systems of the trims and the valve latches open under the effect of the water supply pressure.
The deluge valve Mod VDD can be installed in vertical or horizontal position. It is designed for external resetting, without opening the valve. The cover plates allow in-line maintenance and field replace of the diaphragms to be performed.
The deluge valve Mod VDD is compatible with electric, electro-pneumatic and pneumatic release systems (trims).
The materials of construction make it suitable for being used with sea water or water foam solution within industrial harsh environments and offshore applications.
Built-in bypass line
The patented deluge valve Model VDD has two priming chambers, each one provided with its own diaphragm and trim. The system is fully redundant, with the trims controlled by two independent automatic release systems. Each priming chamber is designed to provide a waterway equal to the waterway provided by a classic deluge valve of the same diameter size. In case of failure of one diaphragm, the opening of the other diaphragm provides the nominal design waterway for the correct operation of the fire suppression system.
Designed to overcome a double failure
A hydraulic bridge between the trims allows each trim to control both the diaphragms, releasing the water trapped in the two priming chambers. In case of failure of one trim, the other trim can open both the priming chambers through a hydraulic bridge. Thus the double chamber deluge valve can overcome a double failure trim plus priming chamber.
Fire suppression system always in service
The double chamber deluge valve allows in-line maintenance to be performed, keeping the fire suppression system in service. In fact, the double chamber deluge valve has two built-in isolation valves located upstream and downstream of the diaphragms respectively. During normal operation the isolation valves are in neutral position. During maintenance the isolation valves can be alternatively turned right or left to isolate the priming chamber which is to be maintained.
Meanwhile, the other priming chamber remains on duty keeping the fire suppression system in service.
An external indicator and proximity sensors allow the position of the two valves to be monitored, and a locking system prevents their accidental or incorrect rotation.
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