Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1974-01-29
1976-04-20
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417 29, 417 40, 137488, F04B 4904, F16K 3112
Patent
active
039515680
ABSTRACT:
A pump check valve control apparatus includes a pump for delivering a fluid to a system. A valve between the pump and the system controls the delivery of the fluid to the system. A valve actuator, signalled by an actuator control, begins to open the valve when the pressure on the pump side of the valve substantially equals the system pressure. During the opening cycle of the valve, a substantially constant pressure is maintained in the system. The actuator control closes the valve so that flow through the valve ceases when the pressure differential across the valve is substantially zero.
REFERENCES:
patent: 2240607 (1941-05-01), Buck
patent: 2339957 (1944-01-01), Smith
patent: 2619110 (1952-11-01), Griswold
patent: 2661023 (1953-12-01), Griswold
patent: 2732804 (1956-01-01), Sadler et al.
patent: 3092305 (1963-06-01), Bresnoff
patent: 3814541 (1974-06-01), Dent et al.
Freeh William L.
General Signal Corporation
LaPointe G. P.
Mednick Jeffrey S.
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