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  2. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

  3. Boiler blowdown - Wikipedia

    en.wikipedia.org/wiki/Boiler_blowdown

    A pipe near the bottom of the blowoff tank maintains a water level below the blowdown entry point and allows cooler water remaining from earlier blowdown events to drain from the tank first. Two bottom blowdown valves are often used in series to minimize erosion. One valve serves as the sealing valve, and the other as the blowdown valve.

  4. List of valves - Wikipedia

    en.wikipedia.org/wiki/List_of_valves

    Clapper valve: a type of check valve used in the Siamese fire appliance to allow only one hose to be connected instead of two (the clapper valve blocks the other side from leaking out) Demand valve, part of a diving regulator; Double beat valve; Double check valve; Duckbill valve; Fill and drain valve: a valve used in space and missile industry ...

  5. Valve leakage - Wikipedia

    en.wikipedia.org/wiki/Valve_leakage

    The importance of valve leakage depends on what the valve is controlling. For example, a dripping tap is less significant than a leak from a six-inch pipe carrying high-pressure radioactive steam. In the United States, the American National Standards Institute specifies six different leakage classes, with "leakage" defined in terms of the full ...

  6. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Valves stop (or regulate) the flow of liquids or gases. They are categorized by application, such as isolation, throttling, and non-return. Isolation valves temporarily disconnect part of a piping system to allow maintenance or repair, for example. Isolation valves are typically left in either a fully open or closed position.

  7. Isabella Strahan Shares Bikini Pics from Bahamas 1 Year After ...

    www.aol.com/lifestyle/isabella-strahan-shares...

    Isabella Strahan is living life to the fullest over a year after being diagnosed and treated for a malignant brain tumor.. The model, 20, shared photos of herself and her sister Sophia from The ...

  8. Why Is My Senior Dog Peeing in the House? 7 Possible ... - AOL

    www.aol.com/lifestyle/why-senior-dog-peeing...

    Take her for shorter but more frequent walks: Your dog can probably not handle long walks but will benefit from being taken out more often. Even dogs with dementia appreciate a “sniff walk ...

  9. If you’re finding your teenage dog difficult, here’s what an ...

    www.aol.com/finding-teenage-dog-difficult-award...

    The teenage stage isn’t easy for anyone, whether you’re the teen or the parent. And that’s not only true when it comes to human teenagers, but canine ones, too.

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