Patent ID: 6019250
Filing Date: 2000-02-01
Classification: B24B

Abstract:
An apparatus for dispensing a liquid to at least one point of use, said apparatus comprising:a plurality of chambers, each having dispense, return and fill modes of operation in which liquid is driven therefrom, unused liquid is returned, and new liquid is introduced, respectively;a liquid distribution system having a flow circuit connected to said at least one point of use to feed said liquid from said chambers and to return said unused liquid from said at least one point of use, said liquid distribution system also having a valve network communicating between said chambers and said flow circuit;said valve network configured such that two of said chambers can be brought into communication with one another, thereby to allow one of the two of said chambers to function in the dispense mode of operation and the other of the two chambers to function in the return mode of operation, receiving said unused liquid from said at least one point of use; andmeans for driving said liquid from each of said chambers into said liquid distribution system during said dispense mode of operation.