Patent ID: 6666655
Filing Date: 2003-12-23
Classification: F04B,F04F

Abstract:
Apparatus for increasing intake pressure of a hydraulic pump, comprising:a nozzle body; a primary flow channel formed in said nozzle body having a flow inlet for communicating with a primary flow of hydraulic fluid and a flow outlet for communicating with the inlet of the hydraulic pump for delivering the primary flow of fluid to the pump through the nozzle body; a bypass flow channel formed in said nozzle body having a flow inlet for communicating with an incoming bypass flow of hydraulic fluid separate from said primary flow, said bypass flow channel including at least one flow restriction device operative to increase the velocity of the bypass flow passing through said flow restriction device for generating a stream of the bypass flow hydraulic fluid with increased pressure at the inlet of the pump adjacent the delivery of the primary flow such that the primary and bypass flows are combined at the pump inlet with an overall increase in pressure of the combined flows; and a bypass valve communicating with said bypass flow channel, said bypass valve being operative to sense back pressure of the incoming bypass flow and, in response to the back pressure exceeding a predetermined control pressure, opening an auxiliary bypass flow channel to divert a fraction of the incoming bypass flow around the flow restriction device for direct combination with the delivery of the primary flow to the inlet of the pump.