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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. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    It is designed to handle the pressure fluctuations). In the case of the upstream check valve passing, the differential pressure (higher supply pressure compared with the lower chamber pressure) causes any flow to occur only in one direction. A buildup of pressure in the chamber in such a case would be relieved to the drain.

  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. Animal lover beaten to death on Christmas Eve while trying to ...

    www.aol.com/animal-lover-beaten-death-pipe...

    Robert "Bobby" Cavanaugh, of Madison Heights, Michigan, was beaten to death on Christmas Eve after he tried to save a dog who was being abused by a neighbor and alleged repeated felon, witnesses said.

  8. Steak has many nutrients, but here's why you should avoid ...

    www.aol.com/steak-many-nutrients-heres-why...

    Few foods are more appetizing to people than a juicy steak. Grilled to order and garnished with herbs like basil and chives, sauces such as au jus, peppercorn and A1, or vegetables like grilled ...

  9. Petcock - Wikipedia

    en.wikipedia.org/wiki/Petcock

    Historically, petcocks were threaded valves controlled by a butterfly handle; [citation needed] modern petcocks are typically ball valves. Compared to the progressive control of a gate valve a ball valve style petcock's is coarse, confining their use principally to on-off applications.

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