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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.
The 1870s and 1880s saw the development of the safety bicycle which roughly resembles bicycles today, with two wheels of equal size, initially with solid rubber tyres. These were typically equipped with a front spoon brake and no rear brake mechanism, but like penny-farthings they used fixed gears, allowing rear wheel braking by resisting the ...
PTFE tubes are used in gas-gas heat exchangers in gas cleaning of waste incinerators. Unit power capacity is typically several megawatts. PTFE is widely used as a thread seal tape in plumbing applications, largely replacing paste thread dope. PTFE membrane filters are among the most efficient industrial air filters.
The head castings and valve head sizes from 1969 to 1976 were different, notably in passages for air injection and spark plug diameters (1969–1974 18 mm, 1975 and up 14 mm). From 1977 onward, the 351W shared the same head casting as the 302, differing only in bolt hole diameters (7/16 inch for the 302, 1/2 inch for the 351W).
There have been a number of 21-inch torpedoes in service with the United States. These have been used on ships and submarines of the U.S. Navy.American 21-inch torpedoes are 533 millimeters (21 in) in diameter.
420 mm at 1000 m, [7] defeat the NATO Single heavy target at 8000 m and the Triple heavy target at 7000 m or 8400 m Use the same penetrator as the OFL 105 F1 105 mm APFSDS in a larger sabot. Upgraded with Israeli-style steel fins instead of aluminium in 1987. [8] DM23 Germany: Rheinmetall 1982 [9] 884 mm 457.7 mm ⌀ 32 × 360 mm 12:1 Tungsten ...
The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres ( 1 / 1 000 m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).
155 mm (6.1 in) is a NATO-standard artillery shell caliber that is used in many field guns, howitzers, and gun-howitzers. It is defined in AOP-29 part 1 with ...
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