Patent ID: 8210205

Claim:
A rotary valve assembly for controlling process fluid flow comprising: a first valve member disposed within a fluid flow path and including at least first and second apertures formed therein through which the process fluid introduced to the rotary valve can flow, wherein a cross bar separates the first and second apertures of the first valve member; a second valve member including at least first and second apertures formed therein that are at least partially aligned with the said first and second apertures of said first valve member within the fluid flow path and through which the process fluid can flow through the rotary valve, wherein a cross bar separates the first and second apertures of the second valve member and wherein the cross bar of the first valve member is perpendicular to the cross bar of the second valve member; and a third valve member rotatably disposed within the fluid flow path between the first valve member and the second valve member and including at least first and second apertures formed therein, wherein an alignment of said first and second apertures of said third valve member relative to said first and second apertures of said first valve member and to said first and second apertures of said second valve member is adjustable to selectively establish a conduit through which the process fluid can flow.