Method and apparatus for controlling a pump

Details Method and apparatus for controlling a pump Method and apparatus for controlling a pump

1974-11-25

1976-05-18

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 28, 417 29, 417279, 417 53, F04B 4900, F04B 4902, F04B 4906, F04B 4908

Patent

active

039573958

ABSTRACT:
A safety control system for a pump and anti-surge valve protects the pump, the valve and the hydraulic main line system. The valve is controlled by a pressure responsive circuit and, via a limit switch on the valve, controls both the steady state running of the pump and the pump start. A timed start circuit allows pressure to build up sufficiently to operate the valve upon initiation of pump operation. The system automatically shuts down upon power, mechanical or hydraulic failure, and prevents continued operation of the pump control valve when the pump has lost suction or there is a decrease in pump discharge pressure.

REFERENCES:
patent: 1280477 (1918-10-01), Hopkins
patent: 1980799 (1934-11-01), Hardosty
patent: 2362724 (1944-11-01), Shea
patent: 3012510 (1961-12-01), Kusner
patent: 3118466 (1964-01-01), Bagwell
patent: 3217653 (1965-11-01), Griswood
patent: 3299817 (1967-01-01), Walter et al.
patent: 3602610 (1971-08-01), Bloom et al.
patent: 3663831 (1972-05-01), Cook
patent: 3814541 (1974-06-01), Dent

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