Fluid control means

Claim 1

IN A FLUID SWITCH COMPRISING AN OUTLET DUCT AND TWO OPPOSED FLUID LOCK-ON WALLS DOWNSTREAM THEREFROM DEFINING TWO LOW PRESSURE REGIONS EFFECTIVE TO SELECTIVELY LOCK FLOWING FLUID AGAINST THE OPPOSED WALLS BY BOUNDARY LAYER ACTION: THE IMPROVEMENT COMPRISING A SLIDEWAY EXTENDING TRANSVERSELY ACROSS THE OUTLET END OF THE DUCT; AN ORIFICE MEMBER MOVABLY MOUNTED IN SAID SLIDEWAY; AND MECHANICAL PWOER MEANS OPERABLY ARRANGED TO MOVE THE ORIFICE MEMBER BETWEEN A FIRST POSITION IN WHICH IT DIRECTS THE FLUID TOWARD ONE OF THE LOW PRESSURE REGIONS AND A SECOND POSITION IN WHICH IT DIRECTS THE FLUID TOWARD THE OTHER LOW PRESSURE REGION; THE ORIFICE IN SAID MOVABLE MEMBER DEFINING TWO OPPOSED ORIFICE SIDE EDGES, THE SPACING BETWEEN THE SIDE EDGES BEING MATERIALLY LESS THAN THE SPACING BETWEEN THE LOCK-ON WALLS SO THAT THE DOWNSTREAM FACE OF THE ORIFICE MEMBER FORMS SEPARATE STEPS BETWEEN RESPECTIVE ONES OF THE ORIFICE SIDE EDGES AND RESPECTIVE ONES OF THE LOCK-ON WALLS; ONE STEP BEING SHORTER THAN THE OTHER IN THE FIRST POSITION OF THE MOVABLE MEMBER, AND THE OTHER STEP BEING SHORTER THAN SAID ONE STEP IN THE SECOND POSITION OF THE MOVABLE MEMBER, WHEREBY THE FLUID WILL LOCK ONTO THAT WALL WHICH IS ADJACENT THE SHORTER STEP.