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  2. Chemigation valve - Wikipedia

    en.wikipedia.org/wiki/Chemigation_valve

    Sometimes called a check valve or a backflow preventer, a chemigation valve is an apparatus designed to protect water supplies from agricultural chemicals used during chemigation, the application of chemicals such as fertilizers and pesticides through irrigation water. [1]

  3. Check valve - Wikipedia

    en.wikipedia.org/wiki/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] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

  4. Dorman Products - Wikipedia

    en.wikipedia.org/wiki/Dorman_products

    Dorman Products, Inc. is a manufacturer of aftermarket automotive products in the United States. The company was founded in 1918. The company was founded in 1918. [ 1 ] [ 2 ] The company trades on the NASDAQ under the ticker DORM. [ 3 ]

  5. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.

  6. 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.

  7. W.H. Dorman & Co - Wikipedia

    en.wikipedia.org/wiki/W.H._Dorman_&_Co

    The Dorman Engineering Co of Northampton is sometimes confused with W.H. Dorman & Co. The principal partner there was Thomas Phipps Dorman (son of Mark Dorman), and the main product was the Dorman sewing machine, though they started manufacturing engines and made the Whirlwind motor cycle for a few years before failing in 1903. [9]

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