An unidirectional microsphere valve is designed.The microsphere valve is mainly composed of valve body

sphere and valve port.The valve port includes a valve inlet and a spoke-like valve outlet with a central hole and a fan-shaped edge.The valve inlet

spoke-like valve outlet and the sphere cooperate with each other to control the one-way flow of liquid.The flow field simulation analysis of microsphere valves with different diameters and different opening heights is carried out by FLUENT software.The simulation results show that the smaller the sphere and the higher the opening height are

the smaller the internal pressure of the ball valve is

at the same time

the smaller the internal speed and the better the flow performance are.The flow characteristics of forward diversion and reverse closure of microsphere valve are studied by experiments.The experimental results show that the smaller the sphere is

the better the forward diversion flow characteristics are

but the reverse closure flow characteristics are relatively poor.Combined with the working environment

it is finally adopted the microsphere valve of Φ2.5 mm silicon nitride ceramic sphere.This study provides a theoretical basis for the integrated application and miniaturization optimization of unidirectional microsphere valve.