Analysis and Emulation of Steady-State Characteristic for Water Hydraulic Proportional Throttle Valve

A new type of water hydraulic proportional throttle valve is designed. The mathematical models of steady-state control characteristic, flow characteristic and load characteristic for the new designed water hydraulic proportional throttle valve are established, in addition some main factors influencing steady-state characteristic are determined, and some steady-state characteristic analysis such as displacement initial current, flow initial current, dead zone and hysteresis and other characteristic is also proceeded. The analysis and emulation show that spool displacement has a good linear relation with input current, and that the output flow of water proportional throttle valve is not only related to type of valve port, but also affected by working pressure difference. In order to gain better steady-state characteristic, the working pressure difference of valve port should be compensated or closed-loop control should be adopted. The result is of great instructive significance for optimizing design parameters of the water hydraulic proportional throttle valve, analyzing dynamic characteristic and designing control system.