Variable-frequency pump and regulating valve combined pressure regulating method for oil conveying pipeline

The invention discloses a variable-frequency pump and regulating valve combined pressure regulating method for an oil conveying pipeline. The method is characterized by comprising the following stepsthat a first manual/automatic shift switch and a second manual/automatic shift switch are used for shifting the service states of the variable-frequency speed regulating pump and the regulating valvecorrespondingly, and shifting among the four kinds of pressure regulating control modes is realized, wherein in the case of the first kind of pressure regulating control mode, the manual rotating speed control of the variable-frequency speed regulating pump and the manual valve position control of the regulating valve are performed, in the case of the second kind of pressure regulating control mode, the automatic rotating speed control of the variable-frequency speed regulating pump and the manual valve position control of the regulating valve are performed, in the case of the third kind of pressure regulating control