Emulation Analysis on Static-state Characteristic of Slide Valve for Water Hydraulic Proportional Throttle Valve

The structure and feature of new-type water hydraulic proportional throttle valve was introduced,and the flow-pressure equation of slide valve was established.Based on emulation analysis on flow characteristic,pressure characteristic and flow-pressure characteristic of slide valve with software MATLAB/SlMULINK,the range of spool displacement was obtained when load moves at rap- id speed and working speed.The analysis shows that there is a linear relationship between flow of load and displacement of spool under steady-state condition,and slide valve controls flow of load more acutely when load moves at rapid speed than at working speed.When the flow passing through valve port is constant,the bigger the spool displacement is,the smaller the pressure amplification coefficient is.When spool displacement is constant,the larger the pressure loss of load is,the less the flow through load is.When the pressure loss of load is steady,the bigger the spool displacement is,the more the flow through load is.The smaller the opening of valve notch is,the smaller the flow-pressure coefficient of valve is,the bigger the rigidity of valve is.On the contrary,the bigger the opening of valve notch is,the bigger flow-pressure coefficient is,the smaller the rigidity is.