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  2. Reversing valve - Wikipedia

    en.wikipedia.org/wiki/Reversing_valve

    Reversing valves are built into the heat pump by the manufacturer, and must be replaced by an HVAC technician if they fail. Since the valve is an integral part of the sealed refrigerant circuit, proper procedures for recovering and then later refilling the refrigerant must be followed, to prevent its loss into the atmosphere.

  3. Nozzle and flapper - Wikipedia

    en.wikipedia.org/wiki/Nozzle_and_flapper

    The nozzle and flapper mechanism is a displacement type detector which converts mechanical movement into a pressure signal by covering the opening of a nozzle with a flat plate called the flapper. [1] This restricts fluid flow through the nozzle and generates a pressure signal.

  4. Downhole safety valve - Wikipedia

    en.wikipedia.org/wiki/Downhole_safety_valve

    A downhole safety valve refers to a component on an oil and gas well, which acts as a failsafe to prevent the uncontrolled release of reservoir fluids in the event of a worst-case-scenario surface disaster. It is almost always installed as a vital component on the completion.

  5. Gas leak - Wikipedia

    en.wikipedia.org/wiki/Gas_leak

    Gas leaks can damage or kill plants. [4] [5] In addition to leaks from natural gas pipes, methane and other gases migrating from landfill garbage disposal sites can also cause chlorosis and necrosis in grass, weeds, or trees. [6] In some cases, leaking gas may migrate as far as 100 feet (30 m) from the source of the leak to an affected tree. [7]

  6. List of pipeline accidents in the United States (1900–1949)

    en.wikipedia.org/wiki/List_of_pipeline_accidents...

    May – Three teachers and a plumber were injured by a gas explosion at Saint Michael's Roman Catholic Church parish school in Pittsburgh, Pennsylvania. [4]October – In Boston, Massachusetts, five women narrowly escaped being burned alive after a leaking gas meter exploded in the basement of their three-story tenement, starting a fire that ascended through the stairwells and drove them out ...

  7. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams.The arrow shows the flow direction. Vertical lift check valve. A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

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