An improvement in a rotary vee device that includes relative rotational and reciprocal motion between the interior walls of the cylinder and the exterior walls of the pistons characterized by each piston having first flow areas defined on its periphery and a first fluid flow passageway; each of the first...http://www.google.es/patents/US4060060?utm_source=gb-gplus-sharePatente US4060060 - Valving system for compressors, engines and the like
Valving system for compressors, engines and the like
