Time delayed shut-down circuit for recirculation pump

Details Time delayed shut-down circuit for recirculation pump Time delayed shut-down circuit for recirculation pump

1974-03-12

1976-06-15

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 38, F04B 4900

Patent

active

039633756

ABSTRACT:
A circuit is provided for shutting off the motor of an intermittently activated, electrically powered fluid recirculation pump to prevent the pump motor from burning out its windings or bearings. A power control relay is energized to activate the pump motor for a predetermined period of time, allowing the pump to reach steady state flow condition, after which a time delay relay opens and current flows to the power control relay through a pressure switch. The pressure switch opens to shut-off the recirculation pump motor whenever the pump discharge pressure falls below a predetermined minimum.

REFERENCES:
patent: 2661697 (1953-12-01), Long
patent: 2741986 (1956-04-01), Smith
patent: 2741987 (1956-04-01), Murphy
patent: 2765743 (1956-10-01), Hollinshead
patent: 2981195 (1925-04-01), Payne et al.
patent: 3030890 (1962-04-01), Galik

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