Patent ID: 7867341

Claim:
A dishwasher comprising: a tub; a fluid circulation assembly for circulating water, said assembly comprising a pump, a first spray arm, and a second spray arm, said pump in flow communication with said first spray arm via a first water passage, said pump in flow communication with said second spray arm via a second water passage; and a water flow blocking mechanism comprising a magnetic water flow blocking device, a magnet positioned outside a conduit providing flow communication between said pump and said first water passage and said second water passage, and a magnet positioning device coupled to said magnet, said magnetic water flow blocking device normally positioned in a pocket formed in said conduit, said magnet positioning device configured to cause said magnet to move from a first position to a second position, such that when said magnet is in said second position said magnetic water flow blocking device is not retained in said pocket by magnetic forces of said magnet and said conduit is configured to channel water only to said second water passage, said magnet positioning device further configured to cause said magnet to move from said second position to said first position while said pump is operating, such that when said magnet is in said first position said magnetic water flow blocking device is maintained in said pocket by a magnetic force of said magnet and said conduit is configured to channel water to said first water passage and said second water passage.