Importance

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Abstract

In a pneumatic pump of the float actuated variety, a radial check valve array is utilized for minimizing the trigger point of the pump relative to the bottom of the leachate and/or groundwater table. The pump includes a fluid-tight casing from which fluid to be pumped can be discharged to an outflow conduit such as a well casing. An outflow conduit extends from a outflow conduit inlet at the bottom inside of the fluid-tight casing to a pumped fluid discharge--such as a well casing--exterior of the casing. An actuating float is disposed within the pump casing and is moveable over a distance responsive to liquid level within the casing from a first lower position adjacent the bottom of the casing to a second upper position for actuating an air inlet to discharge air into the casing. An air inlet check valve is provided having an inlet for communication to a source of air under pressure exterior of the pump casing and an outlet to the interior of the pump casing. Inlet of fluid to be pumped to the interior of the pump casing from the exterior of the pump occurs through the radial check valve array. The array functions to surround the outflow conduit of the pump to enable the outflow conduit and check valve array to overlap, reducing the minimum trigger depth of the pump.

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First Claim