Pumps – Condition responsive control of pump drive motor – By controlling internal combustion drive engine
Patent
1975-12-12
1977-11-08
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
By controlling internal combustion drive engine
137205, 417 63, 417120, 417129, 417149, F04B 4900
Patent
active
040573648
ABSTRACT:
A pumping system intended especially for highly contaminated liquids uses an air pump for drawing liquid into or discharging the liquid from a vessel by creating respectively a vacuum or a pressurized condition within the vessel. A special valve device is provided for the system comprising an air filter in combination with a float-actuated, shut-off switch to preclude the entry of air or liquid-borne contaminants into the pump. The float-actuated switch is arranged to disable a prime mover used for driving the pump. An additional safety feature of the system comprises the provision of an intermediate float valve located between the pump and the valve device, to preclude the passage of liquid therebetween, the intermediate valve having a sight glass to detect leakage liquid and a drain cock to permit drainage of such liquid.
REFERENCES:
patent: 1587864 (1926-06-01), Sargent
patent: 2593172 (1952-04-01), Neumann
patent: 2664911 (1954-01-01), Thompson et al.
patent: 2900915 (1959-08-01), Rowell
patent: 3599639 (1971-08-01), Spotz
patent: 3706319 (1972-12-01), Neese et al.
patent: 3827452 (1974-08-01), Baumgarten
patent: 3867070 (1975-02-01), Sloan
Freeh William L.
Look Edward
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