Storage tank shut-off valve
AssigneeDover Corporation
InventorsDavid R. Pendleton, James E. Kesterman
Life of this patent
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Abstract
An improved control valve for a holding tank is provided for cutting off the flow of fluid into a holding tank device in response to achieving a predetermined fluid level in the holding tank. The assembly includes a housing configured for placement adjacent a spill container. The housing has an upper inlet and a lower outlet and a flow passage therebetween having a diameter of which is substantially constant along its longitudinal length. A valve poppet is situated within the flow passage and is axially rotatable between a substantially vertical, open position, that allows for the flow of fluid through the flow passage, and a closed position substantially blocking fluid flow through the flow passage when the holding tank has reached a predetermined level of fluid.
Claims20
A fluid flow operated overflow control valve for a liquid holding tank, said control valve comprising:
- A substantially hollow body having upper and lower open ends and a flow passage of predetermined diameter therebetween for allowing liquid flow therethrough;
- A rotatable poppet situated within said flow passage for rotation between an open condition and a closed condition;
- An aspirator located at least partially within said flow passage for establishing a pressure differential in response to the flow of liquid through said control valve, said aspirator comprising a sensing tube extending downwardly from said body, and having an inlet situated in at least one of said flow passage and said liquid holding tank at a predetermined liquid fill level;
- An activator responsive to the pressure differential from said aspirator when said predetermined liquid fill level has been reached for moving said rotatable poppet into the flow of liquid in said flow passageway toward said closed condition;
- A deflector situated within said flow passage and generally above and aligned with said rotatable poppet when said poppet is in the open condition;
- and
- a reset element which acts upon said poppet for automatically resetting said poppet toward the open condition after liquid flow through said flow passage has ceased.
A hydraulically operated automatic shut-off valve for a liquid holding tank comprising:
- a substantially hollow body having upper and lower open ends and a flow passage of predetermined diameter for allowing liquid flow therebetween;
- a rotatable poppet situated within said flow passage for rotation between a substantially vertical open condition and a closed condition;
- an aspirator located at least partially within said flow passage for establishing an underpressure in response to the flow of liquid through said shut-off valve, said aspirator comprising a sensing tube extending downwardly from said body and having a lower end situated in at least one of said flow passage, and said liquid holding tank at a selected maximum predetermined liquid fill level;
- an activator responsive to said underpressure when said predetermined liquid fill level has been reached for initiating closing of said poppet;
- a deflector situated within said flow passage and generally above and aligned with said rotatable poppet when said poppet is in the open condition;
- a first reset element connected to said poppet for independently and automatically resetting said poppet to its normally open condition following fill operations;
- and
- said activator comprising a second reset element for independently and automatically resetting said activator to its open condition following fill operations.
Dependencies are inferred from the claim text.