A canted, single vane three-way butterfly valve having a T-shaped housing having an inlet and one outlet port, a third port straddling said inlet and outlet ports, a single vane interspaced between the inlet and outlet ports supported by a central shaft, capable to selectively blocking fluid flow emanating from either inlet or outlet ports from entering said third port when the plenary axis of said vane is tilted forty five degrees from the central axis of either inlet or outlet ports.