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  2. Swagelok - Wikipedia

    en.wikipedia.org/wiki/Swagelok

    Swagelok Company is a $2 billion ... Lennon continued to expand the product line through companies and brands, including Whitey, Cajon, Nupro, and ‘Sno-Trik ...

  3. Fred A. Lennon - Wikipedia

    en.wikipedia.org/wiki/Fred_A._Lennon

    Fred Lennon was born in Providence, Rhode Island, to Patrick and Catherine Lennon, as the youngest of their nine children. [2] By the age of 42, he was living with his wife in an apartment in Cleveland, Ohio, when he borrowed US $500 from his wife's uncle to buy The Crawford Fitting Company later to be renamed Swagelok Company.

  4. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    A swing check valve (or tilting disc check valve) is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle.

  5. 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.

  6. Piping and instrumentation diagram - Wikipedia

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

    Valves and their types and identifications (e.g. isolation, shutoff, relief and safety valves, valve interlocks) Control inputs and outputs (sensors and final elements, interlocks) Miscellaneous - vents, drains, flanges, special fittings, sampling lines, reducers and swages; Interfaces for class changes; Computer control system

  7. 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.

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