LoadSensingPrincipleofOperation.pdf

® No. 03-206 Eaton November 1992 Medium Duty Piston Pumps Load Sensing Systems Principle of Operation Load Sensing Principle of Operation Page The Inception 3 What is Load Sensing? 4 How Load Sensing Works 5 Advantages of Load Sensing 14 Development and Testing 25 Comparison of Systems 26 Applications 27 Future of Load Sensing Systems 27 2 Load Sensing Principle of Operation In the late 1960’s some young engi- desired, but only low working pressure neers pondered the advantages and is required. The closed center system disadvantages of hydraulic systems. takes high pressure drops under these The open center hydraulic system, conditions and generates excessive using a fixed displacement gear pump, heat during this energy wasting provides a fixed flow of oil. System process. pressure is dictated by the resistance to flow in the hydraulic system. A high The engineers thought there must be a pressure relief valve is necessary to better way of combining the advan- control the maximum system pressure; tages of both systems. The ideal when the system reaches maximum