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which type of sprinkler system valve includes a hollow metal post that houses the valve stem and a movable plate with the words open and shut on it?

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The Post Indicator Valve (PIV) type sprinkler system valve has a hollow metal post that houses the valve stem and a movable plate that says "open" and "shut" on it.

Explain about the Post Indicator Valve?

Post indication valves (PIVs) are strong, above-ground access and operator valves used for automatic sprinkler systems and wet standpipe systems whose main water supply valves are buried.

In the case of apartments, a PIV system is often installed inside a wall or the space beneath the roof. It functions by bringing in outside air, filtering it, and then heating the filtered air before dispersing it into any living areas.

The National Fire Protection Association (NFPA) stipulates regulations in NFPA 14: Standard for the Installation of Standpipe and Hose Systems, which specified that each water supply (apart from an FDC) shall be provided with a listed indicating valve in an authorized location.

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