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The internal flow field model of valve spool and valve sleeve annular gap was established. The model was called oil film. The fluid motion state space was laminar flow by calculating of Reynolds number. The formulas about resistance torque and leakage of the valve spool and the valve sleeve annular gap were obtained by calculating. The formula of the energy loss was also obtained by calculating. The optimum annular gap which could make the energy loss to be minimum was obtained from the energy loss formula. In the conditions that valve spool and valve sleeve annular gap had different value, some fluid simulations were done by using FLUENT software. The simulation results showed that the two optimum annular gaps making the energy loss to be minimum was consistent with each other. The one optimum annular gap was obtained by calculating, the other optimum annular gap was obtained by fluid simulation. This provided a basis for optimization of the valve spool and valve sleeve gap value.

Valve spool and valve sleeve annular gap value simulation analysis and optimization in hydraulic rotary self servo valve