Many instruments and piping systems use miniature air pumps as the air source. Some systems need to maintain a relatively stable positive pressure. The ordinary micro air pumps used in the past are connected to pressure sensors to control the start and stop of the micro pumps to adjust the pressure. However, there are many troubles in use. Not only does the pump start and stop frequently, it is not conducive to the life of the pump. The main problem is that the pipeline flow and pressure fluctuate greatly, the pump flow is not accurately adjusted, and it is difficult to ensure stable pressure. Only pressure relief valve should be installed after commissioning. The root cause is the suboptimal performance of the pump itself. If there is a pump that can accurately control the flow rate, it can automatically and timely and accurately match the system after setting. Qihai's new speed-adjusting air pump adopts foreign high-quality brushless motors with the function of real-time feedback of speed signals. The system can conveniently control the flow through PWM speed adjustment and realize closed-loop control. The reliability of the pump is also very good. Another advantage is to solve the problem of interference to the control circuit. This imported version is better than the domestic version, which is very conducive to the stability of the system.