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  2. Fire sprinkler system - Wikipedia

    en.wikipedia.org/wiki/Fire_sprinkler_system

    Because the sprinkler orifices are open, the piping is at atmospheric pressure. To prevent the water supply pressure from forcing water into the piping, a "deluge valve" (a mechanically latched valve) is used in the water supply connection. It is a non-resetting valve, and stays open once tripped.

  3. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    It is theoretically possible that, when both valves are faulty, backflow could occur, should the reverse flow rate exceed the capacity of the relief valve. Because certain combinations of check valve failure and/or system backpressure cause the relief valve to discharge, the device must be mounted in a location where the drain will not become ...

  4. Fire sprinkler - Wikipedia

    en.wikipedia.org/wiki/Fire_sprinkler

    The majority of automatic fire sprinklers operate individually in a fire. Contrary to motion picture representation, the entire sprinkler system does not activate at the same time, unless the system is a special deluge type. [19] [20] Open orifice sprinklers are only used in water spray systems or deluge sprinklers systems.

  5. Solenoid valve - Wikipedia

    en.wikipedia.org/wiki/Solenoid_valve

    Ordinary valves can have many ports and fluid paths. A 2-way valve, for example, has 2 ports; if the valve is open, then the two ports are connected and fluid may flow between the ports; if the valve is closed, then ports are isolated. If the valve is open when the solenoid is not energized, then the valve is termed normally open (N.O.).

  6. Sprinkler fitting - Wikipedia

    en.wikipedia.org/wiki/Sprinkler_fitting

    Fire sprinkler control valve assembly. Sprinkler fitting is a skilled trade that consists of assembling, installing, testing, repairing, inspecting, and certifying automatic fire suppression systems and their associated piping in commercial, industrial and residential buildings.

  7. Fix problems signing into your AOL account - AOL Help

    help.aol.com/articles/help-signing-in

    Use the Sign-in Helper to locate your username and regain access to your account by entering your recovery mobile number or alternate email address.; To manage and recover your account if you forget your password or username, make sure you have access to the recovery phone number or alternate email address you've added to your AOL account.

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