Abstract: By means of experiment and simulation method, the force characteristic of the control valve in the electronic unit pump (EUP) is studied. The resultant force on the valve is obtained based on its displacement data acquired through test. The flow field is simulated with the computational fluid dynamics (CFD) method. The transient inlet and outlet pressure measured are adopted as the boundary of the CFD simulation. The experiment results show that the resultant force’s direction is consistent with that of the valve closing at the end of valve opening, the flow influence on the valve mainly reflects in the static pressure and flow force, especially in the flow force, and they both prevent the valve from opening. The flow characteristic around the valve must be fully taken into consideration for force analysis and structure optimization of the control valve.

Key words: power mechanical engineering, electronic unit pump, control valve, flow force, opening process