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The butterfly valve has been in use since the late 18th century. James Watt used a butterfly valve in his steam engine prototypes. With advances in material manufacturing and technology, butterfly valves could be made smaller and withstand more-extreme temperatures.
Dover Artificial Lift (formerly Norris Production Solutions) [3] is an oilfield services company headquartered in The Woodlands, Texas.The company provides products and services for artificial lift during production of petroleum and natural gas.
The basic Merlin fuel/oxidizer mixture ratio is controlled by the sizing of the propellant supply tubes to each engine, with only a small amount of the total flow trimmed out by a "servo-motor-controlled butterfly valve" to provide fine control of the mixture ratio. [30]
A new version of the Repco V8, with gear-driven double-overhead camshafts and four valves per cylinder, was produced for 1968 to maintain its competitiveness. A figure of 400 bhp (298 kW; 406 PS) at 9,500 rpm was targeted but only about 380 bhp (283 kW; 385 PS) at 9,000 rpm was achieved.
The torch is the tool that the welder holds and manipulates to make the weld. It has a connection and valve for the fuel gas and a connection and valve for the oxygen, a handle for the welder to grasp, and a mixing chamber (set at an angle) where the fuel gas and oxygen mix, with a tip where the flame forms.
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The proposed US–Mexico border wall is slated to pass through the grounds of the National Butterfly Center. [7] [8] Filmmaker Krista Schlyer, part of an all-woman team creating a documentary film about the butterflies and the border wall, Ay Mariposa, [9] estimates that construction would put "70 percent of the preserve habitat behind the border wall."
Media related to Butterflies of North America at Wikimedia Commons "Butterflies of North America" (1868-1872) by W. H. Edwards from the American Entymological Society; second series (1884), third series (1897)