Refill control mechanism for a liquid holding tank

Details Refill control mechanism for a liquid holding tank Refill control mechanism for a liquid holding tank

2006-09-29

2010-10-19

Rivell, John (Department: 3753)

Fluid handling

Liquid level responsive or maintaining systems

By float controlled valve

C137S397000, C137S426000

Reexamination Certificate

active

07814930

ABSTRACT:
A liquid refill control for a holding tank includes a pneumatic solenoid valve for delivering liquid to the tank in an open state and restricting delivery of the liquid to the tank in a closed state. The solenoid valve has a pneumatic exhaust. A container mounted in the tank includes an inlet for introducing liquid from the tank into the container and an outlet formed below the inlet. A discharge valve is operably mounted to the tank for alternately closing and opening the outlet. A lower float closes the discharge valve when the liquid is at or above a predetermined level in the tank and opens the discharge valve when the liquid is below the predetermined level to discharge liquid from the container. A pneumatic exhaust valve alternately opens and closes the pneumatic exhaust which in turn changes the state of the pneumatic solenoid valve. An upper float mounted in the container maintains the pneumatic exhaust valve in one of the open and closed conditions when the liquid in the container is at or above a threshold level and maintains that valve in the other condition when the liquid in the container is below the threshold level.

REFERENCES:
patent: 1132833 (1915-03-01), Coseo
patent: 1188535 (1916-06-01), Ellis
patent: 1600162 (1926-09-01), Browne
patent: 2037245 (1936-04-01), Leifheit et al.
patent: 2314158 (1943-03-01), Peters

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