A hydrostatic unit of the type contemplated by the present invention includes one or more pump and motor combinations interconnected by means of a conventional closed loop. Controls for the hydrostatic unit include a speed control and vent valve assembly as well as a venturi manifold which functions...http://www.google.fr/patents/US3952515?utm_source=gb-gplus-shareBrevet US3952515 - Speed and load responsive underspeed actuator for hydrostatic transmissions
Speed and load responsive underspeed actuator for hydrostatic transmissions
