Simulation and Experimental Analysis of Hydraulic Directional Control for Displacement Controlled System

The characteristics of a hydraulic directional control method for the displacement controlled system are studied. The directional control is realized by the pilot-operated check valve. The reversing operation of the pilot-operated check valve system is investigated with simulation and experiment. The relationship between the valve spool motion and the circuit pressure has been analyzed during the directional control. The pressure reversing points during the directional control can be used to determine the operation state of the pilot-operated check valve system. The results indicate that the valve spool motion can be confirmed by the pressure reversing points. The response becomes faster with a smaller diameter control piston. A smaller hydraulic chamber volume is also an effective method to improve the dynamic response. Higher circuit pressures decrease the dynamic response. The results can be applied for the optimized design of the hydraulic directional control method with the pilot-operated check valve.