Abstract
It is difficult to accurately predict the steady-state flow force of spool valve with U-grooves by the traditional theoretical formulae of flow force. To resolve the problem,a platform with high-precision experimental apparatus and system was built to investigate the steady-state flow force with a multi-way valve as objective,which aimed at obtaining the characteristics of steady-state flow force in different flow directions and the pressure and flow rate characteristics of valve notch. The flow field in the valve was also simulated with computational fluid dynamic (CFD). Both the experimental and simulation results show that the steady-state flow force with U-grooves tends to be negative,which means that the valve notch tends to be open no matter in single in/out flow direction or in double flow directions. The coupling value of the steady-state flow force in the case of single in/out flow direction of the 3/6 valve is almost the same as that in the case of double flow directions. The simulation results of the steady-state flow force together with the pressure difference matched the experimental results well.
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