Rotary engines (also known as Wankel engines and Wankel rotary engines) are quite different from piston or "reciprocating" engines. One of the distinguishing features is that they don't need valves to ...
After reciprocating, sliding vane compressors, also referred to as rotary vane compressors, are one of the oldest types of compressors. The first known description of a sliding vane pump was in a book ...