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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.
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.
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.
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 ...
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 ...
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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