Abstract: Vacuum butterfly valves are widely used for pressure control in medium and low vacuum environments. Due to the strong nonlinearity and time-delay characteristics of the butterfly valve pressure control system, conventional proportional-integral-derivative (PID) control algorithms fail to meet the high-precision pressure control requirements. To enhance the pressure control performance of vacuum butterfly valves, this paper designs an improved fuzzy PID control algorithm with a correction function. Experimental results show that the new controller, utilizing fuzzy PID control, significantly outperforms traditional PID controllers in terms of overshoot and adjustment time. Additionally, with the aid of the correction function, the new controller effectively mitigates the nonlinear effects of the system, improving response speed and control accuracy. The optimized fuzzy PID controller demonstrates superior dynamic performance, reduced control error, and faster target tracking compared to conventional methods, significantly enhancing the pressure control performance of vacuum butterfly valves.