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A level control valve or altitude control valve is a type of valve that automatically responds to changes in the height of a liquid in some storage system. A common example is the set of ballcocks in a flush toilet , where each stage of the flush cycle is actuated by the emptying or filling of the tank.
[8] [9] This early attempt was an important step on the road to self-leveling, even if a full load would cause the whole car to lower evenly, rather than maintain height. In 1957, Cadillac introduced the Eldorado Brougham, a Rolls-Royce Silver Cloud competitor, featuring a new Air suspension with a self leveling feature.
A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower .
HASL or HAL (for hot air (solder) leveling) is a type of finish used on printed circuit boards (PCBs). The PCB is typically dipped into a bath of molten solder so that all exposed copper surfaces are covered by solder.
Hadley, formerly Hadley Institute for the Blind and Visually Impaired, is an American 501(c)(3) non-profit, based in Winnetka, Illinois. It offers instruction online and by mail for individuals who have lost their vision or are blind. [2] Hadley is a partner of the National Eye Institute (NEI) and the National Eye Health Education Program ...
The Vietnam Memorial Bridge (aka Holyoke Bridge, South Hadley Falls Bridge, and County Bridge) is a girder bridge that spans the Connecticut River between South Hadley and Holyoke, Massachusetts. It was built in 1990 to replace the original Holyoke-South Hadley, the Old County Bridge, which was built in 1889 by New Jersey Steel and Iron Company ...
Hadley Rille (also referred to as Rima Hadley) [7] is located to the west of the Apollo 15 landing site and was the subject of substantial investigation during that mission. The feature, named from nearby Mons Hadley , is a channel that was likely formed by volcanic processes earlier in the history of the Moon .
South Hadley (/ ˈ h æ d l iː / ⓘ, HAD-lee) [1] is a town in Hampshire County, Massachusetts, United States. The population was 18,150 at the 2020 census . [ 2 ] It is part of the Springfield, Massachusetts Metropolitan Statistical Area .