Patent ID: 8646481

Claim:
A valve comprising: a valve body; several first valve members, each including a first step and each including a first orifice adjacent the respective first step and configured within and fixed relative to the valve body; and several second valve members, each including a second step and a second orifice adjacent the respective second step configured within and movable relative to the valve body, the second valve members movable relative to the first valve members between open positions, in which the first orifices are fluidly connected with the second orifices, and a closed position, in which the first orifices are substantially fluidly disconnected from the second orifices, wherein the first and second steps are fluidly connected to a respective first orifice and a respective second orifice and substantially fluidly disconnected from the remaining orifices when the second valve members are in the closed position, and the first and second steps are fluidly connected to the first and second orifices when the respective second valve member is in the open position; wherein the first valve members define a portion of a plenum; wherein the first orifices are fluidly connected to the plenum; and wherein the plenum is fluidly connected to a plurality of valves.