The motion law of the pump valve in the deep well has two kinds of rotational motion, besides the straight line motion. When the piston speed is relatively small, the valve ball rotates around the horizontal circle. When the piston speed is large, the valve ball is horizontal autobiography around the vertical side, and it revolves along the valve seat hole angle or the center hole of the valve seat hole. The rotation speed is related to the speed of plunger. The larger the speed of plunger is, the greater the rotational speed of the valve ball. The special motion form of the valve ball is mainly related to the particularity of the valve ball seat structure and the impact of the fluid. The pump valve of deep well pump is a spherical valve. When the fluid flows around it, the phenomenon of the boundary layer will occur at the rear part, and a transverse force will be generated at the same time. Due to the symmetry of the valve ball, the transverse excitement will move around the equator around the valve ball, so that the valve ball is not always on the axis of the seat hole. It is a deviation from a distance and revolving close to the corner of the seat, which is the phenomenon of the rotation.

The fluid flow instability and asymmetry caused by the relative deviation of ball valve ball valve fluid flow, will have the deflection of the ball valve, the lateral force acting on the ball is not. Rather, there is a certain degree of eccentricity on the horizontal surface, so that the valve ball has a rotation on the horizontal surface, which is called autobiography.

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