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Wankel rotary engines don't have valves, they rely on induction and expansion/compression to move air.
If one wanted to really push the definition, the rotor itself acts as both piston and valve in comparison to a Piston ICE. Each rotor in a Wankel rotary engine effectively does the work of 3 pistons, since all 3 out of 4 phases are always occurring on the 3 faces of the rotor.
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