[Huib Visser] built this glass cylinder four-stroke engine and he took ... the demo video we get a good look at how the rotary intake and exhaust valves work. [Huib] also took the time to ...

So, to answer the question, do rotary engines have valves? Yes, they do ... have three power phases instead of just the one of a four-stroke engine. This, along with the way the rotor is mated ...