Patent ID: 7597217

Claim:
A pump assembly used in connection with metering and dispensing fluid, said assembly comprising: a valve mechanism comprising a first valve disc having a first opening in fluid communication with a fluid inlet of said pump assembly and having a second opening in fluid communication with an interior portion of said pump assembly, and a second valve disc having a dispensing opening and an inlet channel, wherein said first and second valve discs are rotatable with respect to each other between at least a dispensing position in which said second opening and said dispensing opening are aligned making dispensing of fluid possible and at least an inlet position in which said inlet channel brings said first opening in fluid communication with said second opening so that said interior portion of said pump assembly is in fluid communication with said fluid inlet of said pump assembly, and wherein the valve mechanism further includes: a sleeve defined to include said fluid inlet of said pump assembly and to include an interior opening to said interior portion of said pump assembly; an end cap having a hollow interior and a bottom opening, said end cap being rotatable mounted to a lower end of said sleeve; said first valve disc is positioned in said end cap and mounted to said sleeve such that said first opening is in fluid communication with said fluid inlet and said second opening is in fluid communication with said interior portion; and said second valve disc is mounted in said end cap such that rotation of said end cap rotates said second valve disc in relation to said first valve disc.