Design and method for a dripless liquid wash aid pumping mechanism
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United States of America Patent
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-
Dec 7, 2010
Grant Date -
N/A
app pub date -
Nov 8, 2007
filing date -
Nov 8, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fluid dispensing system for a dishwasher is disclosed, wherein the dishwasher comprises a housing, a wash chamber enclosed by the housing, and a door for accessing the wash chamber. The dispensing system, in particular, comprises a fluid reservoir for containing a wash aid (such as detergent or a rinse aid) which may be used to treat dishes in the dishwasher wash chamber during a dish cleaning cycle. The system further comprises a pump for dispensing a predetermined quantity of the wash aid from the reservoir into the dishwasher wash chamber and into the reservoir from a supply reservoir one or more times during the dish cleaning cycle. A dual purpose check valve is provided for controlling fluid flow in two opposing directions between the pump and the fluid reservoir. The dual purpose check valve comprises a duckbill valve portion for controlling fluid flow in a first direction, and an umbrella valve portion for controlling fluid flow in an opposing second direction.
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