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NOTE: This is an unformatted excerpt from our online fire protection training library.

Supervisory Initiating Devices

Valve Supervision

Other Fire Suppression Systems

Automatic sprinkler systems and fire protection water supplies are not the only systems in which monitoring the position of control valves may be important. Other types of fire suppression systems also have valves which may require position monitoring.

This low pressure carbon dioxide extinguishing system has two important valves that are often monitored. The main valve main valve
The main valve is the large valve at the upper right of the photo. If this valve is closed it is impossible to get extinguishing agent out of the system. A system like the one shown is often designed to protect many different hazards in the facility. Therefore, impairment of the system can result in a large portion of the facility being without fire protection. controls the flow of all carbon dioxide from the storage tank to the hazard area. A second, much smaller valve called the pilot control valve pilot control valve
The pilot control valve controls the flow of carbon dioxide pressure from the tank to the selector valves for each of the hazards protected by the system. In this type of system pressure from the tank is used to individually open the selector valve for each hazard. The selector valves control the flow of extinguishing agent to the hazards. If the pilot valve is closed, the system cannot operate. Supervision of the pilot valve is one method of minimizing the possibility that this valve could inadvertently be closed., controls carbon dioxide flow to the selector valves for the various hazard areas. If this valve is closed, the system is out-of-service. Both of these valves are often monitored by the building fire alarm system.

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NOTE: This is an unformatted excerpt from our online fire protection training library.

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