A peristaltic pump driven by a single speed power source has a fixed length of flexible wall tubing circumferentially positioned between the wall of the inner chamber and an adjustable band. The flexible band has one end fixed to the pump housing and the other to an adjusting screw. Turning the adjusting...http://www.google.fr/patents/US4288205?utm_source=gb-gplus-shareBrevet US4288205 - Variable volume peristaltic pump
