Abstract
Counter balance valves are used in hydraulic systems to withhold the vertical loads by preventing the free flow of the hydraulic fluid for the safety purpose. But due to this safety feature of the valve, it creates back pressure on the actuator, when the actuation of the cylinder is required in upward direction, to lift the load. This increases the pressure losses across the actuator in the hydraulic system and in turn heat the oil unnecessarily. This, in turn, causes the system to be energy inefficient. But, in today’s competitive world development of energy efficient systems (EES) is an important aspect. In this article, comparison of energy efficient hydraulic system is done using Pilot Operated Counter Balance Valve (POCBV) and Conventional Counter Balance Valve (CCBV) through MATLAB®/Simulink environment. It has been found that POCBV is more energy efficient than CCBV for a particular set of operating conditions. Effects of physical parameters like pilot ratio, spring rate on stability and efficiency used in designing of POCBV are also studied and compared using MATLAB®/Simulink environment. This model is beneficial for hydraulic machine manufacturers engaged in designing of lifting devices in selecting a suitable valve for particular load application and for the designers to design the main components of the valve.
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