Patent ID: 7845361

Claim:
A fluid dispensing system for a dishwasher, wherein the dishwasher comprises a housing, a wash chamber enclosed by the housing, and a door for accessing the wash chamber, said dispensing system comprising: a fluid reservoir for containing a wash aid which may be used to treat dishes in the dishwasher wash chamber during a dish cleaning cycle; a pump for dispensing a predetermined quantity of said wash aid from said reservoir into the dishwasher wash chamber and into said reservoir from a supply reservoir one or more times during said dish cleaning cycle; and a dual purpose check valve comprising a duckbill valve portion for controlling a first fluid flow entering said pump from said fluid reservoir and an umbrella valve portion for controlling a second fluid flow entering said wash chamber from said pump; wherein said pump comprises a piston cylinder body having an aperture on one end thereof, said aperture receiving the duckbill valve portion of said dual purpose check valve.