Method and apparatus for preventing pump cavitation

Details Method and apparatus for preventing pump cavitation Method and apparatus for preventing pump cavitation

1975-02-14

1976-09-21

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

169 24, 415 17, 417 23, 417 27, 417 34, 417 42, F04B 4908

Patent

active

039816184

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.

REFERENCES:
patent: 2384420 (1945-09-01), Griswold
patent: 2707440 (1955-05-01), Long et al.
patent: 2989000 (1961-06-01), Alcaro
patent: 3544235 (1970-12-01), Smith
patent: 3567338 (1971-03-01), Edwards
patent: 3572959 (1971-03-01), Shaughnessy
patent: 3614761 (1971-10-01), Rehm et al.
patent: 3617151 (1971-11-01), Scroggins
patent: 3781907 (1973-12-01), Gerber
patent: 3786869 (1974-01-01), McLoughlin
patent: 3811789 (1974-05-01), Randell
patent: 3828814 (1974-08-01), Neumann et al.
patent: 3864059 (1975-02-01), Smith

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