Multi-stage pump assembly having a pressure controlled valve for controlling recirculation of fluid from the pump stage outlet to the pump stage inlet
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United States of America Patent
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Jul 12, 2016
Grant Date -
Apr 10, 2014
app pub date -
May 18, 2012
filing date -
May 20, 2011
priority date (Note) -
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Abstract
Pump having a pump inlet, a pump outlet, at least two threaded rotors and a pressure controlled valve. The pressure controlled valve is capable of controlling re-circulation of fluid from the pump outlet to the pump inlet. The pressure controlled valve can be a control valve. A multiple stage pump assembly is also provided having least two pumps arranged in series, in which at least one of the pumps is the aforementioned pump.
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