Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1974-11-26
1976-08-10
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
F04B 4900
Patent
active
039738779
ABSTRACT:
A pumping device of the type which is started and stopped by a pressure switch adapted to sense the internal pressure of a pressure tank mounted on the delivery side of a pump. A control valve adapted to open and close the inlet of the pressure tank is provided and operates such that the inlet of the pressure tank is closed when the flow rate of water is above the predetermined minimum level and opened when it is below the predetermined level, so as to apply the delivery pressure of the pump to the pressure tank and actuate the pressure switch. Thus, when the flow rate of water is above the minimum level, the inlet of the pressure tank is closed and no delivery pressure of the tank is applied to the interior of the pressure tank, so that the pressure switch remains inoperative. This keeps the pump from being started and stopped often even if the size of pressure tank is reduced. This type of automatic pumping device is employed as an attachment to water supply facilities for households.
REFERENCES:
patent: 3141475 (1964-07-01), Guinard et al.
patent: 3150684 (1964-09-01), Guinard et al.
patent: 3295450 (1967-01-01), Schonwald et al.
patent: 3572381 (1971-03-01), Nash
patent: 3739810 (1973-06-01), Horan
patent: 3871792 (1975-03-01), Gritz
patent: 3876336 (1975-04-01), Nash
Freeh William L.
Hitachi , Ltd.
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