Research on Matching Strategy of Pilot Hydraulic Resistance for Proportional Valve Based on Displacement-Flow Feedback
The pilot hydraulic resistance bridge of the high water-based proportional valve directly affects the control characteris-tics of the main valve,and the complex pilot hydraulic resistance network composed of multi-function and multi-type hydraulic resist-ance becomes the key to the design of proportional valve.The mathematical modeling,flow field simulation,and experimental investiga-tion were used to analyze the hydraulic resistance characteristics of a displacement-flow feedback high water-based proportional direc-tional valve pilot bridge.Flow leakage from the annular clearance between the valve spool and valve sleeve was considered.The results show that when the annular gap area is constant,the larger the displacement feedback groove width is,the better the displacement feed-back throttle control linearity is.Nevertheless,the larger the displacement feedback groove width is,the higher for pilot fluid bridge flow requirement is,the more difficult of the matching design of high-speed switching valve set is.The back pressure generated by the hy-draulic bridge against the return resistance,the smaller the size of the return resistance is,the better the back pressure effect is,and the worse the displacement feedback groove throttle control linearity is.Based on the flow field simulation results,the design of the high-speed switch valve set and the inlet resistance for the hydraulic bridge was determined through a comprehensive matching process.The effec-tiveness of each approach for matching the size of hydraulic resistances in the pilot hydraulic resistance network was confirmed through experimental validation.
pilot hydraulic resistancedisplacement-flow feedbackproportional directional valvehydraulic resistance matching characteristic
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