at the end of movement in the second direction v 2 water generally flows along the first path p 1 between the inlet port 80 and the first port 76 and water may be blocked from flowing from the inlet port 80 to the second port 78 water flowing along the first path p 1 through the first port 76 exits the valve system 70 through the first nozzle 51 and enters the basin of the sink 10 water passing through the first nozzle 51 will generally flow along the first flow path f 1 see fig2 on the bottom wall 12 of the sink 10 the actuator 95 preferably cycles the valve member 82 in directions v 1 and v 2 in the manifold 74 so that the water varies between the first flow path f 1 and the second flow path f 2 the varying water flow paths f 1 and f 2 serve to more efficiently move waste along the bottom wall 12 to the sump 43 as shown in fig2 the water flow paths f 1 and f 2 are directed longitudinally on the bottom wall 12 in side by side relationship however complete coverage from the front side wall 14 to the rear side wall 15 of the upper surface 54 of the bottom wall 12 of the food preparation sink 10 can be provided by each of the water flow paths f 1 and f 2 the valve member 82 may also be positioned at all points between the directions v 1 and v 2 to provide a continuously variable water flow in the sink 10 along water flow paths f 1 and f 2 in some aspects and in some constructions the electronic control module 94 is.