Abstract:Taking a large-flow proportional directional valve as the research object, AMESim software was used to build a simulation model, and its key structural parameters were improved through orthogonal experiments to obtain the optimal response characteristics. Taking the response time of the outlet valve spool and the response time of the opening and closing of the inlet valve spool as evaluation indicators, the influences of four factors on proportional directional valve, such as the annular orifice, the outer diameter of the outlet valve spool, the diameter of the control chamber and the diameter of the poppet valve port,were studied. The results show that the outer diameter of the outlet valve spool has a significant effect on the response time of the outlet valve, and the diameter of the control chamber has a significant effect on the opening response time and closing time of the inlet valve; the optimal structural parameters are the diameter of the annular damping hole is 2.0 mm, the outer diameter of the outlet valve spool is 30 mm, the diameter of the main valve control chamber is 25 mm and the diameter of the poppet valve port is 31 mm; compared with before optimization, the response time of the outlet valve of the proportional directional valve has been reduced by 22.72%, and the opening response time and closing time have been reduced by 34.29% and 66.44% respectively, which meet the optimization requirements.