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Valve gear. The Walschaerts valve gear on a steam locomotive (a PRR E6s ). The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. It can also serve as a reversing gear.
Valve stem. Replacing a valve stem. A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire ), [ 1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [ 2][ 3] or both, to prevent the gas from escaping. [ 4]
The Valve Index is a consumer virtual reality headset created and manufactured by Valve. Announced on April 30, 2019, the headset was released on June 28 of the same year. [ 6][ 7] The Index is a second-generation headset and the first to be fully manufactured by Valve. Half-Life: Alyx is bundled with the headset.
Valve's logo. Valve is an American video game developer and publisher founded in 1996 by Gabe Newell and Mike Harrington. The company is based in Bellevue, Washington. [ 1] Valve's first game was Half-Life, a first-person shooter released in 1998. [ 2] It sold over nine million retail copies. [ 3][ 4] Alongside Half-Life ' s launch, Valve ...
The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. While basing his design on automotive valves, Caprotti made several significant departures from this design to ...
Joy valve gear. Joy valve gear is a type of steam locomotive valve gear, designed by David Joy (3 March 1825 – 1903), Locomotive and Marine engineer, and patented (no. 929) on 8 March 1879. [ 1] The British patent has not been found but the US patent (US252224 of 10 January 1882) has. [ 2] Joy's gear is similar to Hackworth valve gear but has ...
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