Title: Method and apparatus for preventing pump cavitation

Abstract: The speed of an engine driven pump is sensed and compared with the desired maximum operating speed to detect overspeed. The discharge of the pump is controlled by a variable flow rate controller. When an overspeed condition exists, a command signal is sent to the discharge controller to reduce flow by a discrete decrement. The control signal is blocked after activating the controller for a preselected time interval. During the blocking interval the engine speed is maintained substantially at the operating speed by cyclical reduction of the power input thereto.

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Inventors: Nelson, Jr., George R. (New York, NY, US)

Application Number: 550042
Filing Date: 1975-02-14
Publication_date: 1976-09-21
Assignee: Grumman Aerospace Corporation (Bethpage, NY)
Primary Class(es): 417/12 169/24, 415/17, 417/23, 417/27, 417/34, 417/42
Other Classes:
US Patent Ref:

2384420	Sep, 1945	Griswold	417/12.
2707440	May, 1955	Long et al.	417/12.
2989000	Jun, 1961	Alcaro	417/20.
3544235	Dec, 1970	Smith	417/34.
3567338	Mar, 1971	Edwards	417/34.
3572959	Mar, 1971	Shaughnessy	417/22.
3614761	Oct, 1971	Rehm et al.	417/43.
3617151	Nov, 1971	Scroggins	417/18.
3781907	Dec, 1973	Gerber	417/42.
3786869	Jan, 1974	McLoughlin	417/34.
3811789	May, 1974	Randell	415/1.
3828814	Aug, 1974	Neumann et al.	415/17.
3864059	Feb, 1975	Smith	417/20.

Other Refs:
Primary Examiner: Freeh, William L.
Assistant Examiner: Look, Edward
Attorney: Morgan, Finnegan, Pine, Foley & Lee