354
G. Vishnu Teja and M. Meikandan
Low Hazardous
Facility
Medium Hazardous
Facility
High Hazardous
Facility
Fire Protection Systems
• Hydrants & Water
monitors
• Sprinkler Alarm
valve
• Deluge valve
Hydrants &
Water Monitors
Sprinkler Alarm
Valve
Deluge Valve
Class of explosives used in facility
(Hazardous nature)
As shown in Fig. 1, deluge valve assembly functions on differential pressure
operation allowing quick opening of the valve and thereby rush of water to the
protection system. The valve consists of top valve, bottom valve, and pilot chamber.
Inlet and outlet chambers are separate in deluge valve from set chamber at the valve
chamber and a diaphragm. In setting, pressure is applied to the chamber through a
small pipeline. Pressure is set into set chamber and clapper will hold on to the seat
due to differential design. In the “Setting” position, the clapper divides the inlet from
the outlet by keeping the system piping as dry. If the pressure is release from priming
chamber, the clapper moves and starts the supply water inlet to flow through the
discharge outlet and to spray nozzles.
The deluge valve shall be a control valve assembly which will operate on pressure
difference in the deluge valve assembly due to QBD actuation and also by operating
MCP switch at annunciation panel/control panel in control room.
The deluge valve assembly will consist mainly of the following:
1. Isolation valves
2. Inline strainer
3. Deluge valve assembly
4. Actuator/pilot assembly
5. Water motor gong
6. Drain valve