Search results
Results From The WOW.Com Content Network
A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that flows out of the evaporator ...
During World War II, Parker experienced a boom in business as the U.S. Air Force's primary supplier of valves and fluid connectors. [7] By 1943, the firm employed 5,000 Cleveland, Ohio, residents. After Arthur Parker's death in 1945 [10] and the end of the war, the company neared bankruptcy due to the sudden drop in demand.
WISEA — AllWISE Source Catalog; WISEP — Wide-field Infrared Survey Explorer Preliminary Release Source Catalog; WNC / Winn — Winnecke Catalogue of Double Stars; WNO — Washington Observations (double stars) (U.S. Naval Observatory, Washington D.C.) Wo — Woolley Nearby Star Catalogue; Wolf — Catalogue of High Proper Motion Stars
The usual locomotive valve gears such as Stephenson, Walschaerts, and Baker valve gear, can be used with either slide valves or piston valves. Where poppet valves are used, a different gear, such as Caprotti valve gear may be used, though standard gears as mentioned above were used as well, by Chapelon and others.
A Tesla valve, called a valvular conduit by its inventor, is a fixed-geometry passive check valve. It allows a fluid to flow preferentially in one direction, without moving parts. The device is named after Nikola Tesla , who was awarded U.S. patent 1,329,559 in 1920 for its invention.
The first of these types was the Stölzel valve, bearing the name of its inventor Heinrich Stölzel, who first applied these valves to the French horn in 1814. Until that point, there had been no successful valve design, and horn players had to stop off the bell of the instrument, greatly compromising tone quality to achieve a partial chromatic scale.
The Guide Star Catalog is an online catalogue of stars produced for the purpose of accurately positioning and identifying stars satisfactory for use as guide stars by the Hubble Space Telescope program. The first version of the catalogue was produced in the late 1980s by digitizing photographic plates and contained about 20 million stars, out ...
The valve takes the shape of a ball with a ring around the waist, like the planet Saturn, hence the name. The mechanism contains a small steel ball, held in the ring, which blocks the hole. By pushing the ring in any direction, the player moves the ball out of the way and the fluid can be ejected.