Flow control valve and manufacturing method

The invention provides a flow regulating valve and a manufacturing method, and the flow regulating valve comprises a main valve seat which is internally provided with a containing cavity; the auxiliary valve seat is provided with a first mounting groove, the auxiliary valve seat is in interference fit with the main valve seat, the magnitude of interference between the auxiliary valve seat and the main valve seat is a, and a is smaller than or equal to 0.04 mm; the sealing gasket is arranged in the first mounting groove, the inner diameter of the sealing gasket is D1, the inner diameter of the first mounting groove is D2, D1-D2 is smaller than or equal to 0.04 mm, a valve port is formed in the position, between the sealing gasket and the first mounting groove, of the sealing gasket, and the valve port is communicated with the containing cavity. According to the technical scheme provided by the invention, the coaxiality among the main valve seat, the auxiliary valve seat and the sealing gasket can be improved,