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  2. Double check valve - Wikipedia

    en.wikipedia.org/wiki/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 pressure source.

  3. Dixon Valve & Coupling Company - Wikipedia

    en.wikipedia.org/wiki/Dixon_Valve_&_Coupling_Company

    Dixon Valve & Coupling Company, LLC [1] is a manufacturer and supplier of hose fittings and accessories. The company, often referred to as just Dixon, offers products for fire protection, food processing, dairy processing, beverage and brewery operations, industrial manufacturing, mining, construction, chemical processing, petroleum processing and refining, oilfields, mobile tankers and ...

  4. Chemigation valve - Wikipedia

    en.wikipedia.org/wiki/Chemigation_valve

    "Backflow prevention should include a check valve between the irrigation pump and the injection device to prevent backward flow; a low-pressure drain to prevent seepage past the check valve; a vacuum relief valve to ensure that a siphon cannot develop; and a check valve on the injection line." See also. Air gap; Hydrostatic loop

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  6. Harris County approves Diwali fireworks sales season ... - AOL

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  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. [1]

  8. M-80 (explosive) - Wikipedia

    en.wikipedia.org/wiki/M-80_(explosive)

    Later, M-80s were manufactured as consumer fireworks made from a small cardboard tube, often red, approximately 1 + 12 inches (3.8 cm) long and 9 ⁄ 16 inch (1.4 cm) inside diameter, with a fuse coming out of the side; this type of fuse is commonly known as cannon fuse or Visco fuse, after a company responsible for standardizing the product.

  9. Double dump valve - Wikipedia

    en.wikipedia.org/wiki/Double_dump_valve

    Double dump valves have two trap-door flap plates which open and close on an alternating cycle. The top gate opens to allow collected material to drop through onto the bottom gate. The top gate then re-closes to prevent air leakage above the valve. The bottom gate then opens to allow material to pass completely through the valve.

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