Patent ID: 7837771

Claim:
A valve comprising: a first rotary cylinder valve and a second rotary cylinder valve axially coupled to the first rotary cylinder valve, each of the rotary cylinder valves comprising: a valve body; a valve cylinder rotationally mounted within the valve body; first, second, third and fourth valve seats coupled to the valve body, the valve seats forming seals against the valve cylinder; and a flow divider dividing the valve cylinder, such that flow is prevented between the first valve seat and the third valve seat; wherein the valve cylinder has a first position in which dual independent flow paths connect the first valve seat with the second valve seat and connect the third valve seat with the fourth valve seat; and wherein the valve cylinder is rotatable to a second position in which the dual independent flow paths connect the first valve seat with the fourth valve seat and connect the third valve seat with the second valve seat; wherein the valve cylinders of the first and second rotary cylinder valves are coupled at an endwall to form an integrated, axially compounded valve cylinder, such that the first and second rotary cylinder valves co-rotate.