NOVELTY - A bioreactor valve island comprises a sparge mixing region that receives and mixes a first air input and first gas input(s); an overlay mixing region that receives and mixes a second air input and second gas input(s); at least one output valve pairs, where output valve pair receives a gas from a gas supply of corresponding gas supplies and selectively outputs both a first gas input of the gas to the sparge mixing region and a second gas input of the gas to the overlay mixing region.    USE - For providing a mixed sparge supply and mixed overlay supply for a bioreactor module (claimed).    ADVANTAGE - The bioreactor valve island offers a comprehensive valve island that delivers mixed gases to a bioreactor module and metered gases to a bioreactor module. The bioreactor valve island generates gas mixtures for both the sparge portion and the overlay portion of a bioreactor; requires a minimum of input connections and output connections; and can be fully electronically controlled.    DETAILED DESCRIPTION - A bioreactor valve island comprises a sparge mixing region that receives and mixes a first air input and first gas input(s); an overlay mixing region that receives and mixes a second air input and second gas input(s); at least one output valve pairs, where output valve pair receives a gas from a gas supply of corresponding gas supplies and selectively outputs both a first gas input of the gas to the sparge mixing region and a second gas input of the gas to the overlay mixing region. The bioreactor valve island further comprises two air input valves in communication with the sparge mixing region and the overlay mixing region, where the air input valves pair selectively inputs air to the sparge mixing region and to the overlay mixing region; and gas input valves in communication with the output valve pairs, where a gas input valve of selectively inputs a gas to a corresponding output valve pair.    An INDEPENDENT CLAIM is included for providing a mixed sparge supply and a mixed overlay supply for a bioreactor module from a bioreactor valve island, involving selectively outputting first gas inputs to a sparge mixing region of the bioreactor valve island; selectively outputting second gas inputs to an overlay mixing region of the bioreactor valve island; mixing a first air input and the one or more first gas inputs in the sparge manifold mixer of the bioreactor valve island in order to obtain the mixed sparge supply; and mixing a second air input and the one or more second gas inputs in the overlay manifold mixer of the bioreactor valve island in order to obtain the mixed overlay supply.    DESCRIPTION OF DRAWING(S) - The figure shows a bioreactor valve island.