Auxiliary liquid tank

Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver

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Details

417 36, 417 63, 417441, F04B 4904

Patent

active

041667131

ABSTRACT:
The disclosure is a system for increasing the reliability of systems for keeping auxiliary liquid-holding tanks filled and reliably functional. A float-operated switch cycles an electric pump to maintain the liquid level between full and nearly full, and a back-flow-preventing check valve is employed and modified (apertured and/or bypassed) to permit slow back leakage to "exercise" the system. The pump, its input to the tank, and the check valve are all located below the pump-turn-on level so that they never lose their prime. One arrangement for testing liquid-level control has a float on a lever arm that operates both the pump-motor-cycling switch and also a low-level switch to energize an alarm. The lever arm also rotates a shaft carrying an indicator dial and/or pointer. The shaft has a manually engageable knob or lever for submerging the float to test the operability of the pump, the alarm, and other parts. A second species of the liquid-level control has a float-operated and manually engageable vertical plunger for submerging the float for operating and testing a level indicator, switches for the pump and the alarm, and other parts.

REFERENCES:
patent: 173662 (1876-02-01), Pease
patent: 1002822 (1911-09-01), Cowles et al.
patent: 2057624 (1936-10-01), Burkhart
patent: 2370099 (1945-02-01), Werder
patent: 3172377 (1965-03-01), Dewar
patent: 3436727 (1969-04-01), Pagano

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