Numerical simulation for multi-way valves and fit clearance research based on heat-fluid-solid coupling

It is difficult to accurately calculate the working load of the multi-way valve of the crawler tractor in the traditional method. In practice, the spool and valve body are prone to over-standard leakage and clamping problems in relative movement. This study analyses the mechanism of clamp and leakage problems caused by deformation, considering the influence of gradual change of oil channel diameter and direction change in the valve body caused by the throttling of the spool. Numerical simulation of heat-fluid-solid coupling for multi-way valves is carried out. Under the condition of maximum pressure, the characteristic curve of material deformation of different spool and valve body changes with oil temperature is obtained. By evaluating the fitting characteristics of the spool and valve body of common materials, the optimal fit clearance is determined accurately. This effectively solves the contradiction between the clamping and leakage of the multi-way valve and improves the performance of the multi-way valve.