How does a Fire Fighting System work?
What is a Fire Fighting valve System?
Fire fighting valves consist of a varied range of products which are designed to work at emergency full-flow. This range includes:
These valves control the flow of water in an automatic fire sprinkler system. Therefore, it is critical they remain open to allow water flow to the sprinklers. According to the National Fireprotection Association (NFPA), closed valves are the main cause of sprinkler system failure. There will likely be several control valves located throughout a fire fighting system that separate it into designated sections. These valves come in a variety of sizes and types.
Outside Stem & Yoke (OS&Y) valve (also called an indicating gate valve)—Indicating type means that one can visually determine if the valve is open or closed. An OS&Y valve is open when the threaded stem extends from the valve. The valve is closed when the stem is not visible above the control wheel.
It is another indicating valve in which there is an indicating vane that moves when the valve wheel is turned. The valve is open if the vane is parallel to the riser or direction of water flow. If the vane is perpendicular to the direction of water flow, the valve is closed.
Post Indicator Valve (PIV)
This valve may be mounted on the exterior of the building (horizontal type) or in the yard of the premises (vertical type). The valve indicates its status through a small window on the side, displaying either “OPEN” or “SHUT.”
A tamper switch is an electromechanical device attached or integrated into the valve controls which sends an electrical signal if the valve is moved. The tamper switch alarms should be supervised by a 24-hour remote station or may be locally monitored if the building is continuously occupied.
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