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  2. Tetrode - Wikipedia

    en.wikipedia.org/wiki/Tetrode

    The Marconi-Osram S625, the first commercially produced screen grid tube. The screen is a cylinder with a metal gauze face that completely surrounds the anode, and the tube is double-ended, with the anode terminal at one end and the grid at the other, to improve isolation between the electrodes.

  3. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Valves stop (or regulate) the flow of liquids or gases. They are categorized by application, such as isolation, throttling, and non-return. Isolation valves temporarily disconnect part of a piping system to allow maintenance or repair, for example. Isolation valves are typically left in either a fully open or closed position.

  4. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.

  5. Butterfly valve - Wikipedia

    en.wikipedia.org/wiki/Butterfly_valve

    Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open. A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is ...

  6. Diving cylinder - Wikipedia

    en.wikipedia.org/wiki/Diving_cylinder

    Face sealed isolation manifold on twin 12 L steel cylinders. The plastic discs are records of the latest internal inspection. A cylinder manifold is a tube which connects two cylinders together so that the contents of both can be supplied to one or more regulators. [40] [41]: 164, 165 There are three commonly used configurations of manifold ...

  7. Flat-faced dogs ‘have 40% higher risk of shorter lives than ...

    www.aol.com/flat-faced-dogs-40-higher-160000810.html

    Flat-faced dogs such as pugs and French bulldogs have a 40% increased risk of living shorter lives than other breeds, researchers have said. New study suggests the average life expectancy of all ...

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