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  2. 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. [1]

  3. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    In a feature control frame ( FCF ), the ⌀ symbol tells you that the tolerance zone for the geometric tolerance is cylindrical. Abbreviations for "diameter" include ⌀, DIA, and D. D. diameter; delta. Abbreviations for "diameter" include ⌀, DIA, and D. For delta usage, see for example "delta notes". DIA[ 2] diameter.

  4. Piping and instrumentation diagram - Wikipedia

    en.wikipedia.org/wiki/Piping_and_instrumentation...

    A piping and instrumentation diagram (P&ID) is defined as follows: A diagram which shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on ...

  5. File:Check Valve.svg - Wikipedia

    en.wikipedia.org/wiki/File:Check_Valve.svg

    File:Check Valve.svg. Size of this PNG preview of this SVG file: 512 × 341 pixels. Other resolutions: 320 × 213 pixels | 640 × 426 pixels | 1,024 × 682 pixels | 1,280 × 853 pixels | 2,560 × 1,705 pixels. Original file ‎ (SVG file, nominally 512 × 341 pixels, file size: 355 bytes) This is a file from the Wikimedia Commons.

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    mail.aol.com

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  7. Polarity symbols - Wikipedia

    en.wikipedia.org/wiki/Polarity_symbols

    The commonly used symbol denoting the polarity of a device or adapter consists of a black dot with a line leading to the right and a broken circle (like the letter "C") surrounding the dot and with a line leading to the left. At the ends of the lines leading right and left are found a plus sign (+), meaning positive, also sometimes referred to ...

  8. Double check valve - Wikipedia

    en.wikipedia.org/wiki/Double_check_valve

    Double check valve. A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [ 1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest ...

  9. Hewlett-Packard - Wikipedia

    en.wikipedia.org/wiki/Hewlett-Packard

    Hewlett-Packard. / 37.4136; -122.1451. The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( / ˈhjuːlɪt ˈpækərd / HYEW-lit PAK-ərd) or HP, was an American multinational information technology company headquartered in Palo Alto, California. HP developed and provided a wide variety of hardware components, as well as software ...