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Rotary valves should pose a credible threat to other mechanical valve systems-such as poppet valves-but they have been unable to infiltrate the automotive market. Using Axiomatic Design we have identified significant design problems with existing rotary valves which have prevented their wide-spread use. In addition, we have proposed an innovative solution which removes some couplings in existing rotary valve systems and could potentially be used in automotive applications, although further work must still be performed.