The flexible control operation technology is used to improve the oil production process of the beam pumping system, and the use of an elliptical speed drive motor is one of the solutions to realize this technology. In order to explore the law of movement of the valve ball in the pump with elliptical velocity drive and conventional circular velocity drive, the delayed opening of the valve ball under two working conditions was analyzed,and a fluid?solid coupling simulation model was established to analyze the force law of the fixed valve. The difference of the valve ball movement under the two working conditions was obtained. Finally, the correctness of the theoretical analysis was verified by the bench experiment. The results show that the rate of opening and reaching the maximum lift of the valve ball under the elliptical velocity drive is slower than that of the conventional circular velocity drive, but it seats faster, which can effectively prevent leakage and achieve the purpose of improving oil recovery efficiency.