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Single-stage vacuum pumps typically produce vacuum to 35 torr (mm Hg) or 47 millibars (4.7 kPa), and two-stage pumps can produce vacuum to 25 torr, assuming air is being pumped and the ring-liquid is water at 15 °C (59 °F) or less. Dry air and 15 °C sealant-water temperature is the standard performance basis, which most manufacturers use for ...
NASH also developed vacuum pumps [1] [2] which were applied in the manufacture of pulp and paper and in the sugar industry. [ 3 ] [ 4 ] [ 5 ] During the mid-20th century, NASH continued expanding into industrial markets such as paper, power, petrochemical, general industrial and food markets.
Lewis H. Nash (c. 1852 – November 11, 1923) was an American engineer who invented the liquid-ring-vacuum pump, and was the holder of over a hundred United States patents for pumps, engines, and other equipment. He founded the Nash Engineering Company in 1905, and served as a member of the Connecticut House of Representatives.
The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]
For such pumps, the position of the pump and intake tubing should be lower than the suction point so it is primed by gravity; otherwise the pump should be manually filled with liquid or a secondary pump should be used until all air is removed from the suction line and the pump casing. Liquid ring pumps have a dedicated intake for the priming ...
Most general pumps can increase as well as decrease the pressure of a gas; however, this category contains pumps that are usually exclusively used to decrease pressure. Wikimedia Commons has media related to Vacuum pumps .