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The company was the first pump manufacturer to adapt a rotary pump to the dewatering industry. [2] It manufactures all of its pumps in-house and manages sales, rentals and service through domestic and international field offices, as well as a network of third party distributors. George Jr. died in 1979 at age 25, and George Sr. retired in 1999.
In the field of oil regeneration and re-refining, vacuum pumps create a low vacuum for oil dehydration and a high vacuum for oil purification. [44] A vacuum may be used to power, or provide assistance to mechanical devices. In hybrid and diesel engine motor vehicles, a pump fitted on the engine (usually on the camshaft) is used to produce a vacuum.
The company was founded by George D. Roper in 1890, primarily as a manufacturer of home appliances, pumps, and other industrial products. He entered part ownership in the Van Wie Gas Stove Company of Cleveland, Ohio. The Van Wie plant moved to Rockford, Illinois and passed into trusteeship in the early 1890s. George D. Roper became the sole ...
An oil diffusion pump is used to achieve higher vacuum (lower pressure) than is possible by use of positive displacement pumps alone. Although its use has been mainly associated within the high-vacuum range, down to 1 × 10 −9 mbar (1 × 10 −7 Pa), diffusion pumps today can produce pressures approaching 1 × 10 −10 mbar (1 × 10 −8 Pa) when properly used with modern fluids and accessories.
Airlift pumps use compressed air to lift water; Pulser pumps use a subterranean air chamber to lift underground water; Suction dredges use a variety of the gas lift called an airlift pump to vacuum mud, sand and debris; Mist lifts use vaporized water to draw seawater in ocean thermal energy conversion systems
A vacuum ejector, or simply ejector, or aspirator, is a type of vacuum pump, which produces vacuum by means of the Venturi effect.. In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area.
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