A pinch valve module comprising a housing, a cylindrical cavity formed in the housing, plural passageways leading from the cavity to the exterior of the housing and spaced about the cavity and a coaxial rotor rotatable within said cavity. The rotor has a diameter less than the diameter of the cavity...http://www.google.fr/patents/US4457339?utm_source=gb-gplus-shareBrevet US4457339 - Multiprogrammable pinch valve module
