Youba liquid injection pump setting

Does the subject want to ask "the principle of Youba injection pump"? Atmospheric pressure. According to the relevant data, Youba liquid injection pump forms the pressure difference between inside and outside through the atmospheric pressure outside the pipe, thus easily promoting injection. The feed rate of injection pump is calculated as ml/hour, with the upper limit of 99.9 ml/hour and the lower limit of 0. 1 ml/hour/hour. ..